Another great thing about 4.88’s vs. 5.13: it may not be a huge difference especially since ring and pinion gears aren’t really a problem with Dana 44’s, but the 4.88’s are slightly stronger because less teeth=thicker/bigger teeth=stronger gear.
Excellent video Brad. Prior to this video, I knew nothing about basic gear ratios. 8 mins later, I have a basic understanding that I can build upon. Thank you, Not only was I entertained but, I receive real value from this one.
I'm running 4.88's as well and am really happy with them. As you mention, if you're driving the Jeep daily/or almost daily, then 4.88's are the best choice for 35/37's. 5.13's are a bit too low in my opinion for daily driving. If you're towing your rig then you want performance over anything else and 5.13's make sense. But if you drive your rig daily and/or to and from the trail, then yea, 4.88's are the way to go. I also calculated the overall gear ratio with tire size included, to get my RPM's as close to stock as possible at a 65mph cruising speed. There are a LOT of opinions about how to break in gears too. The shop that did mine, are mostly a big-rig shop, and they told me truck drivers come in and get their gears re-done, then immediately hit the highway with a load. Their big-rigs don't have any issues so the "break in" suggestion in their opinion is mostly folklore. They did suggest changing the oil after 500 miles though. I took it easy on mine, just in case and they've been fine. As they say, "your mileage may vary." lol
I have a 2013 rubicon JKU. Had factory 4.10 when I was running 35” tires. I went to 37” & 4.88 gears. I’ve been very happy with my decision. I pull a little camper and it handles it well.
hiding out here in colorado people tend to lean towards the 5.13s with 37s simply because of the mountains. im running a 12 jku sahara with one ton axles 5.38s and 41.5 pitbull rockers. i really noticed the rotational mass with the bigger tire vs the 40 inch nittos. however im very happy with it and its a point an go jeep also my daily but i dont drive that far for work so its no big deal.
2011 JKU 3.8L auto with 4"/3.5" lift and 285/75R18 on stock wheels with 2" spacers. Went with 5.13 gears. Excellent bottom end grunt, no OD hunting (even up decent grades), and getting 15-16 MPG combined driving. Pretty happy with it, and definitely have the option of going to 37s with no problems.
Just wanted to say that i love that you start the video with a brief description what the video is all about, even before your logo. Very good job respecting your viewers time.
When I had my Cherokee, I did 4.56 gears with 31s. I had lockers f/r and knew that 33s would probably cause breakage even with hp D30 / chry rear axle. The next owner put 33s on it and never had a problem, but he also didn’t need to regear! My Xterra has 4.9 gears * and the off-road performance with 31s is amazing *factory gearing
Very well done and awesome job explaining the gear ratios. Nice to know you are happy with the 4:88's with the 37's. Your videos are so professional now. No bull, straight to the point, honest and informative...Thank you!
As a 2011 Rubicon guy, I went with the 5.13s to help spin my 35s. I would easily have chosen exactly as you did, even with the 37s, if I'd had the 3.6L engine. But already sucking wind with 80 less horsepower on the 3.8L, the 5.13s gave me the slightly better low end push I needed to outrun the turtles who would overtake me on the highway onramp. ;)
4.88 on 35s with the 3.6 love it, one thing people dont account for when going up in tire size it's like always towing a trailer everywhere you go because the engine load is so high. That's why most people myself included see an increase in mileage. That said you can go to far and lose that mpg gain in your increased torq.
Perfect breakdown. This helped me make my decision 👌 if you want a dedicated Offroad performance gear ratio bump it up to 5.38(if it will fit in your axle or course) the higher you go in ratios the higher your rpms will run so that translates to less mpg. If it’s a daily driver and a weekend warrior from time to time go with the chart he stated and round up to the nearest ratio. In his case it’s the 4.88. Even with 35s the 4.88 is a good choice. It’s pushing lighter tires than 37s and it’s Rpms are still very suitable for a DD
That formula was a great help! I've been trying to decide for MONTHS now if I should go from 4.10s to 4.88's or 5.13's. And, I've actually decided on something more than 5.13's. I plan on going to 35's on my '01 Jeep soon, and even going 5.13 wouldn't give me the additional power I am looking for. Thanks a ton for this video, and thanks a ton for sharing how you made your decisions! Thankfully, Mine is not a daily driver, nor do I utilize it a ton, so that helped out. Great video. -Matt
Lots of good info on this video. There's a lot of factors that should be considered when choosing a gear set. Everyone will have different opinions but it comes down to what you want to achieve with your rig and understanding what each gear set will provide. 👍
Most people think that formula will “return” it to the stock ratio. That formula accounts for size only and will return the “speed” (rpm to mph) back to normal, but the engine will still be working harder because it neglects that the tire is also heavier. The formula that really needs to be used is (new height X new weight X old gear) / (old height X old weight) = new gear.
2008 Rubicon JKU. 4 Door. Auto trans. Running 37’ s with beadlocks 5:38 gears and G2 chrome moly axles . Daily driver / wheeler Runs great on off-road and on. Super chips as well
I was quoted $2900 by a 4X4 shop. After watching your last video I called up Rebel Offroad and I go in Wednesday. I told them I had watched your video and that had helped me decide.
Years ago I was building my xj. Did a 6" lift and bfg 33's. It was tolerable but I knew gears were on the short list. A few months later I went to heavier tires and that made it almost unbearable. Went with 4.56 gears right then, which means night as well do lockers. Changed it into a totally different rig. Plenty of power back and crawled everywhere without issue. Would easily to a standing power break on dry pavement with those 33's. Bone stock 4.0 litter.
Just did my gears. 4.88 by Globex Performance in NJ. They run a $1,000 special for any ratio. So far I am VERY happy with my new ratio. Running 35's on 6spd 09 JK X. the stock 3.73 just fell flat on their face every time I was in the mountains or trying to pass on the highway. Should have done this years ago!!!
Thanks. I am currently running 3.73 gears with a stock 2010 JK Sport suspension but I am looking to eventually upgrade to 35 inch or larger tires. So, this is very useful in terms of recon for helping me decide what will work best for me. Thanks again!
3.73 only come stock on Rubicons, and Willys. All other JK wranglers come with 3.21s unless you get the tow package or pay extra to upgrade to 3.73. Good video overall. Thanks for your contribution to the Jeep community. :)
I really liked your ratio calculation. Makes total sense. I have a 2 door JK with 35" tires and recently added a front big brake kit from teraflex, new steering stabilizer, adjustable track bar, and a magnaflow performance series exhaust and now my JK feels heavy. It still has some power with the 4.10 gear ratio but not as before. I have been thinking about 4.88 for the near future. First need to recuperate from these purchases :)
I've had my gear set since before Christmas and my local mechanic has no time to do it so i dropped it off at a specialty shop and he took me right in. The problem with automatic transmissions is the computer in the Gladiator has to be programmed for 4.88 ratio vs the 3.73 or it won't shift. Thankfully i had a programmer that upgraded everything as it did the tire size for the speedometer via GPS so I'm finally back to happy again
I have a 2011 2 door Rubicon. which means I have the not so good V-6. I am running 35 inch tires. I went with the 5.13 gears. I like them. I can just idle up and down every thing.
The 3.8 V6 engine isent the most powerfull i have a 2009 jeep mountain edition and i can agree there is not enough power on road and off road aspecial in the dunes but it in 4L its ok... i just struggle with tall dunes but i make it up regardless 😂. And also the fuel consumption is UNBELIEVABLE... i am scared to drive my long distance
On my 96 Chevy SS (350ci) I had 35" tires, started with 373 gears and went to 456. WHAT A DIFFERENCE! I actually gained MPG in town and it climbed like a mountain goat!
I spoke to Rebel Off Road about re-gearing my 2020 Gladiator Rubicon to 488. They do seem to have the best price in town and from the conversation a cool bunch of people. Mentioned finding their shop through your video… thanks Trail Recon.
One thing people should know and don’t know is, by changing the “final” gear ratio which is in your Diff, you are also effecting the low range gear in your T-Case, in other words, your transfer case “low ranger gear” will feel much lower since they are all interlinked and essentially you are hitting two birds with one stone. Changing the R&P is one the best mods I have done to my truck.
I put 488 in my Jeep also and l’m very much happy . I’m going to pull a 19fbs e-pro camper I have ordered hope it does the job. Camper weight 3074 lb dry weight.
This helped a lot, I don’t know much about gears or any of that and I’m upgrading from 33’s to 35’s here soon and have factory 3.21 gears so it’s good to have at least some knowledge now
Thank you, Bard. I am in a similar boat as you were where I was debating between 4.88 and 5.13, but after watching your video I think I will be going with 4.88 as well. I have an 06 modified Wrangler Rubicon (originally Sport but had swapped Dana 30/35 with Dana 44s from another 06 Rubicon) with 35-inch Tires but I plan to upgrade to 37s in the near future.
This was very valuable and informative video,it did help me make the right decision best for me. I decided to go 4:88 on 35tires my daily driver from previous owner had stock 3.73 in them.
More gearing is always better than coming up short. It’ll make your JK better in all areas for what the jeeps built for. Pos 3.21s to 4.88s on 35” for me. I’d done 5.13 if I lived in the Mnts.
Good call on the 488’s. I mentioned before I’m running that ratio with 37” tires. I had used the same formula and choose them for the same reasons. The Jeep is my daily driver. Also, I drove it from San Diego to Alaska last summer on the AlCan highway, worked great and averaged approximately 17.5 mpg. I think you’ll be happy with your choice.
I went with 4:88’s last year in my (new to me) ‘07 JKU and I love them as well. I decided on 4:88 for exactly the same reason you did. Love your videos, keep up the great work!
Hey Brad, I’ve been watching your channel for a while now and really like the way you explain things. I had a 2010 JKUR that made 6 trips from Ky to Co. to Moab, to Sedona to N.Dakota, etc. Always made sure to hit Moab and Ouray. I was just running 2” budget lift and 34” tires. Put 100,000 miles on it with very few issues. Never any extreme trails but did Hells Revenge and Top of the World. Now I’ve go to a 2018 JLUR. Did Moab last year stock but have now lifted it and gone to 37’s. I, like you, realize the need for regearing, so 4.88’s are my next upgrade for sure. I dont wheel as hard or often as you do but the highway miles on these trips I think would just really kill my overall mpg
Same here. 4.88 on 37s and since they had they had everything opened up I too, took the opportunity to upgrade my axle shafts to 35 spline G2 gold placers, ARB air locker to accommodate the higher spline count & 3 link truss.
I have the 5 speed auto in my 2012 Sahara too with Yukon 4.88 and ARB lockers in the front D30HP and rear D44. Perfect match for the highway as well as off the road. 20" Fuel Anza wheels and 37" Mickey Thompson tires. Around 105KM/h it spins around 2250 RPM.
Just seeing this video. I have been trying to figure out which ratio to to with, 4.88 or 5.13. I have 2021 JLUR and put 37s on it with 2.5” lift. This video and the math helped immensely, I’m going to run the 4.88 gears. Many thanks on the great info.
Great video. This is one upgrade you want to get right the first time. I went with 4.88 in my 97 XJ. I have a 4spd automatic and I have 35's, great gear choice for the driving and wheeling that I do.
Great Video! I chose to run 4.88’s as well and I’m super happy with them. I’m currently running 35’s but I really only wanted to re-gear once so if I ever want to upgrade to 37’s, 4.88’s will still work out nicely.
@@DustySteel I haven’t had the jeep for a little while but if I remember correctly, I used to sit around 2400-2600 on the highway doing 110-120km/hr. Not sure what that is in miles.
Had a 13 JK on the factory 3.21 😬 with 33” tires and manual for about 2 years before I swapped in a 4.56 and Eaton tru trax rear end. My god was the difference worth the price. Anyone running 3.21 so before lift and tires, do a swap.
4:10 Super Easy Gearing Calculation Considering going to 60s and 74Weld Portals is making me revisit this topic again, and wouldn't ya know it Doc pops up as usual. Keep putting quality content Master Chief! 4:40 P.S. 4.74 is about as dead center between 4.56 and 4.88 as you can get when you math it out. So these "Couple Different Factors" become even more crucial to making the decision on which direction to go. I would add the power/torque of the engine and torque multiplication of the trans to this decision. P.S.S. Those 2 points would make a excellent short!
I currently have 3.73 and running 35” tires. I have a set of 4.88 gears in the garage. Once my locker is off backorder I will be able to install these! I can’t wait.
I went with 5.13 and 37s on my '13 JKU Sport. I would have gone lower but my limiting factor was the Dana 30 up front. Though it was perfect for me and did some cross country coast to coast trips, it wasn't ideal on the road. It wasn't my daily but the sacrifice on the road was well worth the preformed on the street/ highway.
I installed 4.88s went I upgraded to Cooper STT Pro 315/70/17s. Was running 3.73s before. Good performance, mpg down from 17 to 14 / 15. Will be doing 37s in the future so the 4.88s. Just finished the run in period and had my diff oil switched out, now time for some 4 wheeling :) Keep making great content, it was your review of the coopers which sealed the deal for me to get some myself.
we upgraded our front to the exact same chromoly axle kits. Rear will be upgraded as well. always appreciate how well you explain what you are doing and how it works Brad!
4.88s are also a little stronger than the 5.13s in the Dana 44. I'm running 5.13s in my 1-tons with 40s, and it seems to be the sweet spot for me. I do a lot of highway driving also. One thing to mention is that a lower gear (higher number) can actually increase fuel mileage if it keeps you closer to your ideal cruise rpm and keeps you from down shifting all the time. I cruise down the highway at 80mph at exactly 3000rpm, but the 3.6 is perfectly happy there. This is almost exactly the same as my stock 4.10s and 32" tires.
@@mikegunn9557 Yes, I am happy. I could have gone 5:13 but the front axle is only a D30 hence my choice. Had the front bee a D44 like the rear, I would have done 5:13 with my 35s.
16 JKUR Hard Rock. 4.88's going in on Friday, with Teraflex Balljoints. Still on 35's but 37's soon. C Gussets are already installed as well as SteerSmarts Yeti XD Kit!
Thanks, @trailrecon! I was leaning towards the 4.88 for my Gladiator running 37’s. I’m swapping axles for ProRock 44’s, and swapping to RCV instead of U joint axles. For the wheeling I do, this is great. Keep up the great work on the videos!
I regeared from 4.10 gear ratio to 4.88 because I went from 35s to 37s. Dont know if it makes a difference but I have a manual transmission. 4.88 with 37s put my rpm at 2650 at 110 kms per hour. I felt that was reving a bit high. Since then I've moved up to 40s. My rpm with the same 4.88 gears is now at 2250 at 110 kms per hour. Only time I have to drop down to 5th is if I hit a steep hill on the highway. I feel my rig cruises better now than with the 37s. It did seem a little more sluggish but I dont really care. I didnt buy a jeep to drag race. When I'm in 4 low it's awesome too.
Exactly. 2010 Rubicon. Put 5.13 gears with 37's. After mods, it was 700 pounds heavier. AEV procal to set the new tire size and gears. This jeep ran well at 80mph on the highway. Still got the same mpg as stock. The 3.8l likes a little higher revs. But with the new 3.6l I'd probably choose 4.88.
Well thought out video and good choice in gears! Since my JLU is not my daily driver and when we do drive it we carry a full compliment of camping gear, I'll be going with 5:13's in Dana 60's with 37" rolling stock. And you made an excellent point about your DD needs. I too commute 60 miles a day M-F, but in a Prius! LOL!
I am running 35’s on my DD and went with 4.56 up from 3.29. I am extremely pleased with them and the mountain passes are a breeze. 2017 JKU SPORT MANUAL.
Brad, very informative video, you did a great job explaining things as well as the various gear options. Good to hear the 4.88 gears are working out for you. Looking forward to your next video.
Engine, transmission and weightt make a big difference too! I just regeared my 2008 JK Rubicon to 5.38s with 37 Cooper STT Pro. Huge improvement, gas mileage hasn't changed much. Brad, I wish I would have done this way way back myself lol👍
I like your vids, though I don't have a Jeep. I run an 04 Chevy S10 Crew Cab. Stock it had tiny 29" tall tires. It's going big, with 40" tires. My stock ratio was 3.42's. According to the math I should go with 4.88 gears. But in my experience a little bit more rpm, isn't going to hurt because the engine isnt working as hard to drive the vehicle. I picked 5.13 gears which would be like if i had 3.73 gears in my s10. Which would give increased low RPM TQ for increased acceleration. In stock setup at 65mph i cruised at roughly 1900 rpm. With new setup my 65mph cruising rpm will be roughly 2,000 rpms. Which really isn't going to effect the mpg's that much. Granted larger heavier tires and now more air resistance is going to effect the fuel economy. But that is the sacrifice we make to make our 4wd's more off road capable. Awesome vids. By the way. Really digging the overlanding vids.
Fiancé got 2024 wrangler with extreme package so it came with 35’s and 4.55 gears by default. When she ordered it there was an option to do the 4.88 gears and I told her to do that as well since she will go to 37’s. I figure if the factory offers those size gears for 35’s the 4.88 is probably best for 35 and 37 tires. Maybe a 38. Any bigger tire I would want somewhere in 5.xx gearing.
When I first started wheeling TrailRecon was the first channel I saw and I have followed it ever since. It is so well done. And this was a very informative video to help me understand gearing. In fact all of your videos have been very informative, no matter the subject. I know this is an older thread, but I have plans to build my Jeep as I will be doing the Rubicon trail with Jeepers Jamboree at the end of July. I have decided on the shop, but I’m having some reservations about the gearing. I have a 2013 JKU that is stock except for 33” tires and 2" spacer. I plan to re-gear, air lockers, new driveshaft, new skid plates, 37” tires, 3.5” or 4.5” MetalCloak lift, 1 ton steering kit, trussed Dana 44 axle on the front with RCV joints. I was recommended 5.13 gears but I’m wondering if maybe I would be better suited for 4.88 in the long run. I have been wheeling for about 5 years. As I said doing the Rubicon Trail and and have about 60 some trails here in Arizona. I used to live in SD now AZ and want to do trails in CA. I want to do some overlanding as well. I am in the season of retirement at 73, so I don't have the daily commute. I know that’s a lot of information and my Jeep is supposed to go in next week. Thanks Brad.
i looked at RPM charts and went with 4.88 myself on 37s. put all the performance back to stock (minus that slight bit of extra weight you can still feel).
I just had my '12 JKU done, went from stock 3.21 to 4.56. Currently running 32s but will be going up to 35s within the next year. I also went with the revolution gears and am 200 miles into my 500 mile break in period. Off work tomorrow and plan on filling the jeep up in the morning and going for a drive! Love the channel and all the informative videos.
hello, congratulations on your good work, thanks to you the consumer is carefully informed. now i have an ambiguity for the ratio of my gladiator rubicon, i live in quebec in canada, my job is snow removal with tractors, for moons, everyone knows that a jeep is superior to a truck. I want to install a front plow to push snow. in the summer I have a boat that weighs 3000lbs, I am often on the road for travel, my top speed here in Canada is a maximum of 120 kilometers per hour. what would be the best ratio for my utility, the ideal for me is the maximum of force and power while respecting the speed of the engine at approximately 1700 revolutions in 8iem clutch. thank you !
Jim Doss My plan has been 4.56 for soon-to-come 35s; as I start to consider an eventual second step up to 37s, I’m debating going on up to 4.88s so I’m only regearing once. Time will tell, LOL.
Jim: Would appreciate any update now that you have been running 4.56 gears on 35s for a while. I am in the process of a front axle swap (Dana30 to Tera44) and making a jump in tire size. The 2016 JK came with 32s and 3.21 gears (3.6L automatic). I initially went with 33.5” tires and am now increasing again to 35s after 48k miles. I am torn between 4.10 and 4.56. This is may daily driver but we do take annual overland trips of 3k to 6k miles. Very little highway driving. THANKS.
I really needed the information you provided in your video. I have a 2015 Rubicon 2dr, and was trying to decide between the 4:88 & 5:13. I was leaning towards the 4:88 bc I like to travel to my wheeling spots. Now I'm sure. Thx.
Having wontons&40's put on 2017 jku, shop doing thr mods said 5.38 gears would be best. No engine mods except for turbine air induction. Will let you know how it works out end of January. Thaks for another great video and sharing ideas.
I guess you have not seen the youtube video where a guy put a cold air intake and took it to the dyno. It did not get the same HP as when he ran it through stock.
Another great thing about 4.88’s vs. 5.13: it may not be a huge difference especially since ring and pinion gears aren’t really a problem with Dana 44’s, but the 4.88’s are slightly stronger because less teeth=thicker/bigger teeth=stronger gear.
fwiw: 4.88 , 5.13, and 5.38 all share a 8 tooth pinion gear.
Excellent video Brad. Prior to this video, I knew nothing about basic gear ratios. 8 mins later, I have a basic understanding that I can build upon. Thank you, Not only was I entertained but, I receive real value from this one.
So glad you got some good information from it, thank you!
I'm running 4.88's as well and am really happy with them. As you mention, if you're driving the Jeep daily/or almost daily, then 4.88's are the best choice for 35/37's. 5.13's are a bit too low in my opinion for daily driving. If you're towing your rig then you want performance over anything else and 5.13's make sense. But if you drive your rig daily and/or to and from the trail, then yea, 4.88's are the way to go. I also calculated the overall gear ratio with tire size included, to get my RPM's as close to stock as possible at a 65mph cruising speed.
There are a LOT of opinions about how to break in gears too. The shop that did mine, are mostly a big-rig shop, and they told me truck drivers come in and get their gears re-done, then immediately hit the highway with a load. Their big-rigs don't have any issues so the "break in" suggestion in their opinion is mostly folklore. They did suggest changing the oil after 500 miles though. I took it easy on mine, just in case and they've been fine. As they say, "your mileage may vary." lol
Yep! Especially for a stock 2.5 yj.!
I have a 2013 rubicon JKU. Had factory 4.10 when I was running 35” tires. I went to 37” & 4.88 gears. I’ve been very happy with my decision. I pull a little camper and it handles it well.
Thank you for explaining gears to a novice, you made it easy to understand
hiding out here in colorado people tend to lean towards the 5.13s with 37s simply because of the mountains. im running a 12 jku sahara with one ton axles 5.38s and 41.5 pitbull rockers. i really noticed the rotational mass with the bigger tire vs the 40 inch nittos. however im very happy with it and its a point an go jeep also my daily but i dont drive that far for work so its no big deal.
2011 JKU 3.8L auto with 4"/3.5" lift and 285/75R18 on stock wheels with 2" spacers. Went with 5.13 gears. Excellent bottom end grunt, no OD hunting (even up decent grades), and getting 15-16 MPG combined driving. Pretty happy with it, and definitely have the option of going to 37s with no problems.
I’m glad I found this video, it saved me a lot of money and time, most shops wanted $1400 more than rebel off-road and 2 days with the Jeep . Thanks
You know that the other shops were using expensive synthetic KY for butt fucking each other if they keep it overnight 😆😂🤣
Just wanted to say that i love that you start the video with a brief description what the video is all about, even before your logo. Very good job respecting your viewers time.
When I had my Cherokee, I did 4.56 gears with 31s. I had lockers f/r and knew that 33s would probably cause breakage even with hp D30 / chry rear axle. The next owner put 33s on it and never had a problem, but he also didn’t need to regear! My Xterra has 4.9 gears * and the off-road performance with 31s is amazing
*factory gearing
Very well done and awesome job explaining the gear ratios. Nice to know you are happy with the 4:88's with the 37's. Your videos are so professional now. No bull, straight to the point, honest and informative...Thank you!
Thank you, I really appreciate it. I put in a bit of work for these types of videos, but they are fun to make and great to hear it is helping folks!
I just got my 4.88 gears installed this week. I am very happy with the upgrade. The break-in is going okay.
Added 488 gears when I ordered my 2024 Wrangler. Glad I did. Mileage sucks but low end take off is fantastic.
As a 2011 Rubicon guy, I went with the 5.13s to help spin my 35s. I would easily have chosen exactly as you did, even with the 37s, if I'd had the 3.6L engine. But already sucking wind with 80 less horsepower on the 3.8L, the 5.13s gave me the slightly better low end push I needed to outrun the turtles who would overtake me on the highway onramp. ;)
4.88 on 35s with the 3.6 love it, one thing people dont account for when going up in tire size it's like always towing a trailer everywhere you go because the engine load is so high. That's why most people myself included see an increase in mileage. That said you can go to far and lose that mpg gain in your increased torq.
another JKowner what MPG are you getting now
Im torn between installing 4.56 vs 4.88 gears, problem is my J10´s transmission final ratio is 1:1 = 2800rpm vs 3000rpm doing 60mph on the highway
Ya if you're going to do alot of highway driving that would me as well. But if it's mostly city and trails then I'd do it
@@Richboyrich26 I get about 15mpg on interstate at 65 and around 13.5 to 14 at 70
Perfect breakdown. This helped me make my decision 👌 if you want a dedicated Offroad performance gear ratio bump it up to 5.38(if it will fit in your axle or course) the higher you go in ratios the higher your rpms will run so that translates to less mpg. If it’s a daily driver and a weekend warrior from time to time go with the chart he stated and round up to the nearest ratio. In his case it’s the 4.88. Even with 35s the 4.88 is a good choice. It’s pushing lighter tires than 37s and it’s Rpms are still very suitable for a DD
That formula was a great help! I've been trying to decide for MONTHS now if I should go from 4.10s to 4.88's or 5.13's. And, I've actually decided on something more than 5.13's. I plan on going to 35's on my '01 Jeep soon, and even going 5.13 wouldn't give me the additional power I am looking for. Thanks a ton for this video, and thanks a ton for sharing how you made your decisions! Thankfully, Mine is not a daily driver, nor do I utilize it a ton, so that helped out.
Great video.
-Matt
Lots of good info on this video. There's a lot of factors that should be considered when choosing a gear set. Everyone will have different opinions but it comes down to what you want to achieve with your rig and understanding what each gear set will provide. 👍
Most people think that formula will “return” it to the stock ratio. That formula accounts for size only and will return the “speed” (rpm to mph) back to normal, but the engine will still be working harder because it neglects that the tire is also heavier. The formula that really needs to be used is (new height X new weight X old gear) / (old height X old weight) = new gear.
2008 Rubicon JKU. 4 Door. Auto trans. Running 37’ s with beadlocks 5:38 gears and G2 chrome moly axles . Daily driver / wheeler Runs great on off-road and on. Super chips as well
Thanks for sharing your setup!
So 4.88 should be ok on my 2011 JKU rubicon with auto trans and 35" tires. Some graphs recommend 5.13 with my setup.
I was quoted $2900 by a 4X4 shop. After watching your last video I called up Rebel Offroad and I go in Wednesday. I told them I had watched your video and that had helped me decide.
WOW! $2900 is crazy! I think you'll be happy with Rebel.
Years ago I was building my xj. Did a 6" lift and bfg 33's. It was tolerable but I knew gears were on the short list. A few months later I went to heavier tires and that made it almost unbearable. Went with 4.56 gears right then, which means night as well do lockers. Changed it into a totally different rig. Plenty of power back and crawled everywhere without issue. Would easily to a standing power break on dry pavement with those 33's. Bone stock 4.0 litter.
Just did my gears. 4.88 by Globex Performance in NJ. They run a $1,000 special for any ratio. So far I am VERY happy with my new ratio. Running 35's on 6spd 09 JK X. the stock 3.73 just fell flat on their face every time I was in the mountains or trying to pass on the highway. Should have done this years ago!!!
M Baker hey I live in ct. it cost you 1000$ out the door for parts and labor?
@@chrispaul1943 about $1500 with taxes parts and labor. The $1,000 didn't include the overhaul kit, just ring and pinion swap
Thanks. I am currently running 3.73 gears with a stock 2010 JK Sport suspension but I am looking to eventually upgrade to 35 inch or larger tires. So, this is very useful in terms of recon for helping me decide what will work best for me. Thanks again!
3.73 only come stock on Rubicons, and Willys. All other JK wranglers come with 3.21s unless you get the tow package or pay extra to upgrade to 3.73. Good video overall. Thanks for your contribution to the Jeep community. :)
I really liked your ratio calculation. Makes total sense. I have a 2 door JK with 35" tires and recently added a front big brake kit from teraflex, new steering stabilizer, adjustable track bar, and a magnaflow performance series exhaust and now my JK feels heavy. It still has some power with the 4.10 gear ratio but not as before. I have been thinking about 4.88 for the near future. First need to recuperate from these purchases :)
How's the 488s ?
I've had my gear set since before Christmas and my local mechanic has no time to do it so i dropped it off at a specialty shop and he took me right in.
The problem with automatic transmissions is the computer in the Gladiator has to be programmed for 4.88 ratio vs the 3.73 or it won't shift. Thankfully i had a programmer that upgraded everything as it did the tire size for the speedometer via GPS so I'm finally back to happy again
I have a 2011 2 door Rubicon. which means I have the not so good V-6. I am running 35 inch tires. I went with the 5.13 gears. I like them. I can just idle up and down every thing.
The 3.8 V6 engine isent the most powerfull i have a 2009 jeep mountain edition and i can agree there is not enough power on road and off road aspecial in the dunes but it in 4L its ok... i just struggle with tall dunes but i make it up regardless 😂. And also the fuel consumption is UNBELIEVABLE... i am scared to drive my long distance
On my 96 Chevy SS (350ci) I had 35" tires, started with 373 gears and went to 456. WHAT A DIFFERENCE! I actually gained MPG in town and it climbed like a mountain goat!
I spoke to Rebel Off Road about re-gearing my 2020 Gladiator Rubicon to 488. They do seem to have the best price in town and from the conversation a cool bunch of people. Mentioned finding their shop through your video… thanks Trail Recon.
One thing people should know and don’t know is, by changing the “final” gear ratio which is in your Diff, you are also effecting the low range gear in your T-Case, in other words, your transfer case “low ranger gear” will feel much lower since they are all interlinked and essentially you are hitting two birds with one stone.
Changing the R&P is one the best mods I have done to my truck.
Excellent additional information, thank you!
Yes that's a great point. The Jeep will crawl slower and more controller now. I noticed a big improvement that way when I re geared our JK with 513
I put 488 in my Jeep also and l’m very much happy . I’m going to pull a 19fbs e-pro camper I have ordered hope it does the job. Camper weight 3074 lb dry weight.
This helped a lot, I don’t know much about gears or any of that and I’m upgrading from 33’s to 35’s here soon and have factory 3.21 gears so it’s good to have at least some knowledge now
Thank you, Bard. I am in a similar boat as you were where I was debating between 4.88 and 5.13, but after watching your video I think I will be going with 4.88 as well. I have an 06 modified Wrangler Rubicon (originally Sport but had swapped Dana 30/35 with Dana 44s from another 06 Rubicon) with 35-inch Tires but I plan to upgrade to 37s in the near future.
This was very valuable and informative video,it did help me make the right decision best for me. I decided to go 4:88 on 35tires my daily driver from previous owner had stock 3.73 in them.
I think you made the right choice with the gear selection. Now you just need to buy a beater for driving to work.
I went from. A 1997 un modified civic to a wrangler on 35s. I’ve realized that gas mileage has left the chat.
To Do list in the background says XJ-plan Baja. You have my interest. Who doesn’t love an XJ
More gearing is always better than coming up short. It’ll make your JK better in all areas for what the jeeps built for. Pos 3.21s to 4.88s on 35” for me. I’d done 5.13 if I lived in the Mnts.
Good call on the 488’s. I mentioned before I’m running that ratio with 37” tires. I had used the same formula and choose them for the same reasons. The Jeep is my daily driver. Also, I drove it from San Diego to Alaska last summer on the AlCan highway, worked great and averaged approximately 17.5 mpg. I think you’ll be happy with your choice.
Do you have a 3.8L or 3.6L?
I have 4.88’s in my Rubicon. It’s Not horrible on 35’s. I have the 37’s, just need to put them on.
I went with 4:88’s last year in my (new to me) ‘07 JKU and I love them as well. I decided on 4:88 for exactly the same reason you did. Love your videos, keep up the great work!
What size tires u and and what’s your mpg now I just got 5.13 to put in but thinking I may need to take them back and get 4.88
@@willrushing8218 I’m running 35x12.50-18 Bfg mud terrain’s and getting around 16 mpg city and 18 Hwy.
Hey Brad, I’ve been watching your channel for a while now and really like the way you explain things. I had a 2010 JKUR that made 6 trips from Ky to Co. to Moab, to Sedona to N.Dakota, etc. Always made sure to hit Moab and Ouray. I was just running 2” budget lift and 34” tires. Put 100,000 miles on it with very few issues. Never any extreme trails but did Hells Revenge and Top of the World. Now I’ve go to a 2018 JLUR. Did Moab last year stock but have now lifted it and gone to 37’s. I, like you, realize the need for regearing, so 4.88’s are my next upgrade for sure. I dont wheel as hard or often as you do but the highway miles on these trips I think would just really kill my overall mpg
Same here. 4.88 on 37s and since they had they had everything opened up I too, took the opportunity to upgrade my axle shafts to 35 spline G2 gold placers, ARB air locker to accommodate the higher spline count & 3 link truss.
Some relief knowing someone else using their off-road rig as their daily driver too lol
I have the 5 speed auto in my 2012 Sahara too with Yukon 4.88 and ARB lockers in the front D30HP and rear D44. Perfect match for the highway as well as off the road. 20" Fuel Anza wheels and 37" Mickey Thompson tires. Around 105KM/h it spins around 2250 RPM.
Just seeing this video. I have been trying to figure out which ratio to to with, 4.88 or 5.13. I have 2021 JLUR and put 37s on it with 2.5” lift. This video and the math helped immensely, I’m going to run the 4.88 gears. Many thanks on the great info.
Which engine? Happy with rpm, power, mpg?
I've got 4.88's running 37's. Used the same calculation to determine what gears to run too.👍
It's a great combination in my humble opinion!
How did u fix/correct the erratic shifting after regearing??
@@Megatron0405 did you recalibrate your speedometer?
One of the best informative videos I’ve seen great job
Great video. This is one upgrade you want to get right the first time. I went with 4.88 in my 97 XJ. I have a 4spd automatic and I have 35's, great gear choice for the driving and wheeling that I do.
How high are you rpms at highway speed 65-70mph ? I’m thinking about going 4.88 in my 2001 xj but I do t want my rpms to high because it’s my DD
@@moejr14 2500 to 2800.
Great Video! I chose to run 4.88’s as well and I’m super happy with them. I’m currently running 35’s but I really only wanted to re-gear once so if I ever want to upgrade to 37’s, 4.88’s will still work out nicely.
What are your rpms going 70mph running 4.88s and 35s. What is your average mpg?
@@DustySteel I haven’t had the jeep for a little while but if I remember correctly, I used to sit around 2400-2600 on the highway doing 110-120km/hr. Not sure what that is in miles.
@@DustySteel about 12 litres per 100km. So about 20-25 mpg if I’m correct
the math looks like a good logical way to decide which ring and pinion to use. I've never seen that, and I'm a believer in math, it's usually right.
Oddly enough I was thinking about Re-Gearing for a few days now. Very Influential and informative Thank You
Glad the information was helpful, thank you!
Does a higher gear ratio (i.e 4.88) result in better acceleration during the first few gears?
Had a 13 JK on the factory 3.21 😬 with 33” tires and manual for about 2 years before I swapped in a 4.56 and Eaton tru trax rear end. My god was the difference worth the price. Anyone running 3.21 so before lift and tires, do a swap.
Stock gears 3.73 on stock Willys wheels with 35s
How is the Willys Jeep running on 35s, bought me a 2015 wanting to get 35 on it
4:10 Super Easy Gearing Calculation
Considering going to 60s and 74Weld Portals is making me revisit this topic again, and wouldn't ya know it Doc pops up as usual.
Keep putting quality content Master Chief!
4:40 P.S. 4.74 is about as dead center between 4.56 and 4.88 as you can get when you math it out.
So these "Couple Different Factors" become even more crucial to making the decision on which direction to go.
I would add the power/torque of the engine and torque multiplication of the trans to this decision.
P.S.S. Those 2 points would make a excellent short!
I currently have 3.73 and running 35” tires. I have a set of 4.88 gears in the garage. Once my locker is off backorder I will be able to install these! I can’t wait.
How did it go?
I went with 5.13 and 37s on my '13 JKU Sport. I would have gone lower but my limiting factor was the Dana 30 up front. Though it was perfect for me and did some cross country coast to coast trips, it wasn't ideal on the road. It wasn't my daily but the sacrifice on the road was well worth the preformed on the street/ highway.
I installed 4.88s went I upgraded to Cooper STT Pro 315/70/17s. Was running 3.73s before. Good performance, mpg down from 17 to 14 / 15. Will be doing 37s in the future so the 4.88s. Just finished the run in period and had my diff oil switched out, now time for some 4 wheeling :) Keep making great content, it was your review of the coopers which sealed the deal for me to get some myself.
I went with 4.56 gear change and running 35” BFG Km2’s. Very happy.
Should add, I have a 17 JKU Sport S auto transmission and an AEV 2 1/2” Lift. And a ProCal.
we upgraded our front to the exact same chromoly axle kits. Rear will be upgraded as well. always appreciate how well you explain what you are doing and how it works Brad!
4.88s are also a little stronger than the 5.13s in the Dana 44. I'm running 5.13s in my 1-tons with 40s, and it seems to be the sweet spot for me. I do a lot of highway driving also. One thing to mention is that a lower gear (higher number) can actually increase fuel mileage if it keeps you closer to your ideal cruise rpm and keeps you from down shifting all the time. I cruise down the highway at 80mph at exactly 3000rpm, but the 3.6 is perfectly happy there. This is almost exactly the same as my stock 4.10s and 32" tires.
I chose 4:88 gears for my JKU with 35" tires.
Are you Happy with your gear choice ??..... Leaning towards the exact same ratio.
@@mikegunn9557 Yes, I am happy. I could have gone 5:13 but the front axle is only a D30 hence my choice. Had the front bee a D44 like the rear, I would have done 5:13 with my 35s.
For the longest time I couldn't find a good video on regearing. Incredible job, thanks, very informative. (I love the use of be roll)
So glad you found it helpful, thank you!
Thank you for explaining this in simple English
Put 513s in 09 wrangler 4 door manual locked on 35s no gas mileage and no more tires lots of fun and lots of breaks.. used to be a daily lol
Noticed a new addition to the "to do list" board
16 JKUR Hard Rock. 4.88's going in on Friday, with Teraflex Balljoints. Still on 35's but 37's soon. C Gussets are already installed as well as SteerSmarts Yeti XD Kit!
Thanks, @trailrecon! I was leaning towards the 4.88 for my Gladiator running 37’s. I’m swapping axles for ProRock 44’s, and swapping to RCV instead of U joint axles. For the wheeling I do, this is great. Keep up the great work on the videos!
I regeared from 4.10 gear ratio to 4.88 because I went from 35s to 37s. Dont know if it makes a difference but I have a manual transmission. 4.88 with 37s put my rpm at 2650 at 110 kms per hour. I felt that was reving a bit high. Since then I've moved up to 40s. My rpm with the same 4.88 gears is now at 2250 at 110 kms per hour. Only time I have to drop down to 5th is if I hit a steep hill on the highway. I feel my rig cruises better now than with the 37s. It did seem a little more sluggish but I dont really care. I didnt buy a jeep to drag race. When I'm in 4 low it's awesome too.
Another good video. 2016 2 door jk, I'm running 4.56 gears with pro comp 35's, and at 65 mph it's running 2500 rpm. Works for me.
On 5:13's because it was on 37's and was going to upgrade to 40's eventually.
Exactly.
2010 Rubicon. Put 5.13 gears with 37's. After mods, it was 700 pounds heavier. AEV procal to set the new tire size and gears.
This jeep ran well at 80mph on the highway. Still got the same mpg as stock. The 3.8l likes a little higher revs.
But with the new 3.6l I'd probably choose 4.88.
I know this is a 5 yr old comment, but is/was your rubi an auto or manual?
Well thought out video and good choice in gears! Since my JLU is not my daily driver and when we do drive it we carry a full compliment of camping gear, I'll be going with 5:13's in Dana 60's with 37" rolling stock. And you made an excellent point about your DD needs. I too commute 60 miles a day M-F, but in a Prius! LOL!
Thank you! I really should get a better commuter car, I just enjoy driving my Jeep too much.
Great video and the right amount of explanation. Thank you. I am going through the same decision now - balancing off road with daily driving.
I am running 35’s on my DD and went with 4.56 up from 3.29. I am extremely pleased with them and the mountain passes are a breeze.
2017 JKU SPORT MANUAL.
3.29 to 4.56 is a huge difference.... I'll bet it cruise great on those 35's.
Another great video from Trail Recon, thank you Brad!
Brad, very informative video, you did a great job explaining things as well as the various gear options. Good to hear the 4.88 gears are working out for you. Looking forward to your next video.
Thank you, really glad you found the information informative!
Engine, transmission and weightt make a big difference too! I just regeared my 2008 JK Rubicon to 5.38s with 37 Cooper STT Pro. Huge improvement, gas mileage hasn't changed much. Brad, I wish I would have done this way way back myself lol👍
I like your vids, though I don't have a Jeep. I run an 04 Chevy S10 Crew Cab. Stock it had tiny 29" tall tires. It's going big, with 40" tires. My stock ratio was 3.42's. According to the math I should go with 4.88 gears. But in my experience a little bit more rpm, isn't going to hurt because the engine isnt working as hard to drive the vehicle. I picked 5.13 gears which would be like if i had 3.73 gears in my s10. Which would give increased low RPM TQ for increased acceleration. In stock setup at 65mph i cruised at roughly 1900 rpm. With new setup my 65mph cruising rpm will be roughly 2,000 rpms. Which really isn't going to effect the mpg's that much. Granted larger heavier tires and now more air resistance is going to effect the fuel economy. But that is the sacrifice we make to make our 4wd's more off road capable. Awesome vids. By the way. Really digging the overlanding vids.
Fiancé got 2024 wrangler with extreme package so it came with 35’s and 4.55 gears by default. When she ordered it there was an option to do the 4.88 gears and I told her to do that as well since she will go to 37’s. I figure if the factory offers those size gears for 35’s the 4.88 is probably best for 35 and 37 tires. Maybe a 38. Any bigger tire I would want somewhere in 5.xx gearing.
Thanks for the calculation to find the right gear ratio. Love the videos!
When I first started wheeling TrailRecon was the first channel I saw and I have followed it ever since. It is so well done. And this was a very informative video to help me understand gearing. In fact all of your videos have been very informative, no matter the subject.
I know this is an older thread, but I have plans to build my Jeep as I will be doing the Rubicon trail with Jeepers Jamboree at the end of July. I have decided on the shop, but I’m having some reservations about the gearing. I have a 2013 JKU that is stock except for 33” tires and 2" spacer. I plan to re-gear, air lockers, new driveshaft, new skid plates, 37” tires, 3.5” or 4.5” MetalCloak lift, 1 ton steering kit, trussed Dana 44 axle on the front with RCV joints. I was recommended 5.13 gears but I’m wondering if maybe I would be better suited for 4.88 in the long run. I have been wheeling for about 5 years. As I said doing the Rubicon Trail and and have about 60 some trails here in Arizona. I used to live in SD now AZ and want to do trails in CA. I want to do some overlanding as well. I am in the season of retirement at 73, so I don't have the daily commute. I know that’s a lot of information and my Jeep is supposed to go in next week. Thanks Brad.
i looked at RPM charts and went with 4.88 myself on 37s. put all the performance back to stock (minus that slight bit of extra weight you can still feel).
I just had my '12 JKU done, went from stock 3.21 to 4.56. Currently running 32s but will be going up to 35s within the next year. I also went with the revolution gears and am 200 miles into my 500 mile break in period. Off work tomorrow and plan on filling the jeep up in the morning and going for a drive! Love the channel and all the informative videos.
It was very valuable an v informative.I have ordered mine with 4.88 and it is great! thanks a lot!
Glad it was helpful!
I like that formula, it seems to work for me in my case as far as variance as to where I was at stock.
hello, congratulations on your good work, thanks to you the consumer is carefully informed. now i have an ambiguity for the ratio of my gladiator rubicon, i live in quebec in canada, my job is snow removal with tractors, for moons, everyone knows that a jeep is superior to a truck. I want to install a front plow to push snow. in the summer I have a boat that weighs 3000lbs, I am often on the road for travel, my top speed here in Canada is a maximum of 120 kilometers per hour. what would be the best ratio for my utility, the ideal for me is the maximum of force and power while respecting the speed of the engine at approximately 1700 revolutions in 8iem clutch. thank you !
Non DD, 37s, automatic, went with 5.13s.
Holy crap 2.5 hours that’s awesome! All the shops in okc want my Jeep for 2 days at least.
Right? 2.5 hours for two guys equals 5 hours worth of labor. That's less than a day's worth of work, which is really impressive.
Marco (@ovrlndx) and Eric (@american_overland) and I all drove up together and they did all 3 of our Jeeps in record time... the same 2 guys!
Captain Rudy 4021 what shop you going to I live close to okc I’m having my girlfriends dad do mine he was a mechanic for 25 years.
@@roamingtiger I don't live in okc
Captain Rudy 4021 sorry replied to the wrong person.
Great Choice! Something worth mentioning is the 4.88 pinion shaft is much larger and stronger than the 5.13
Next you’ll run 40’s with the LS 😎
You are correct about the 4.88's being a little stronger. I doubt I'll ever get and LS... CA won't smog them.
@@TrailRecon Next time you're out in the desert let me know. Would love to go out with you guys. I'm in the Palm Desert area.
I'm running 4.56 on 34" tires. Seems to work well.
Jim Doss My plan has been 4.56 for soon-to-come 35s; as I start to consider an eventual second step up to 37s, I’m debating going on up to 4.88s so I’m only regearing once. Time will tell, LOL.
Jim: Would appreciate any update now that you have been running 4.56 gears on 35s for a while. I am in the process of a front axle swap (Dana30 to Tera44) and making a jump in tire size. The 2016 JK came with 32s and 3.21 gears (3.6L automatic). I initially went with 33.5” tires and am now increasing again to 35s after 48k miles. I am torn between 4.10 and 4.56. This is may daily driver but we do take annual overland trips of 3k to 6k miles. Very little highway driving. THANKS.
2011 JKUR Auto 5:38's with 37in tires and RIPPed supercharger, 70mph at about 2400RPM's
One of the best 3.8l setups out there!
What mpg?
@@robertstewart2518 I get 17-18mpg on the freeway and 13- in town
2dr with 35 KO2s running 3.73 gears. Love the combo for a daily driver but on the trail it could use new gears.
Brad your work is simply outstanding man! Love Love your videos. I learn so much from them. Thanks again sir!
I really needed the information you provided in your video. I have a 2015 Rubicon 2dr, and was trying to decide between the 4:88 & 5:13. I was leaning towards the 4:88 bc I like to travel to my wheeling spots. Now I'm sure. Thx.
Having wontons&40's put on 2017 jku, shop doing thr mods said 5.38 gears would be best. No engine mods except for turbine air induction. Will let you know how it works out end of January. Thaks for another great video and sharing ideas.
Sounds like it's going to be a beast of a JKU!
I agree with your reasoning and choice if gearing! Great video again Brad! Happy trails to you!
I'm runnin 35's on the stock 4.10 gears. I put on an air intake and a superchips 93 octane tune on and have plenty of power.
I guess you have not seen the youtube video where a guy put a cold air intake and took it to the dyno. It did not get the same HP as when he ran it through stock.