Fixing Speedometer after Tire or Gear ratio change - YJ - TJ - NP231
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- เผยแพร่เมื่อ 14 ส.ค. 2021
- Maybe you did a gear swap, or changed tire size. Or maybe both! This is how to fix / calibrate your speedometer back to accurate, by replacing the speedometer gear in transfer case. For Jeep YJ, TJ and (maybe some XJ others with np 231 ??) and I also explain how to choose which speedometer gear to choose for your np231 transfer case. (based on year, tire size and gear ratio)
Its really easy to swap the speedo gear in a YJ and Ill show ya
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📺 I also made a video on determining your gear ratio here: • Gear Ratio - 3 Simple ...
If you have a question or need help, don’t hesitate to ask in the comments! I try to answer all questions 🤙
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📺 I also made a video on determining your gear ratio here: th-cam.com/video/8N2npR2jCwU/w-d-xo.html
What is the correct name of this part?
Awesome video! Finally a good one on mechanical speedo
Thanks! Glad it helped
You must have known I was about to do this! Very helpful and informative. I can’t sit up under my Jeep but I’m only on 35s. Looking forward to what is next!
Well we are at the badlands off-road park as I type this however I broke the jeep so there won’t be a video from here lol. I still have another smorr video to edit and release when I get home
Not just that but the dirt bike broke too and there’s 6 of us so we can’t really continue without it. We were going to redbird next but that’s been cut from the trip
I JUST did it on my 2.5. I've found if you get it aligned, use the clamp to help tighten it down, get it in there pretty square and then start tightening it down and it'll go in itself
Just don’t force it
thanks now i can get my xj fixed
I dont know exactly what year of XJ that it switched from long to short shafts, but id suspect its also 1991 like the YJ
Great video ! So I have a 1970 charger , Iam about to change the tire size , can I do the same thing you did to achieve the correct speedometer reading ?
It’s just a 2 Wheel Dr. transmission instead of a transfer case so as long as it uses the same style gear. From my understanding the old Dodges use the same ones as the jeep with the longer shaft.
I have seen two charts now with slightly different gear choices IE tire/axle to speedo gear tooth count. The two I have seen are two teeth different from each other... I think I will use your chart when I install my new axles/gears and 35s since you tested it with a GPS speedometer and was near perfect. My TJ is off 10 MPH low, above 50 MPH with 3.73 and 33s, I have no idea what gear I put in it when I originally rebuilt the T-case so who knows, maybe it's correct for 35s Haaa.
I have looked on google image search and noticed a difference. Honestly certain gear/tire combos probably fall between 2 sizes. I would err on the side of calling your tire 1" smaller than it is. Most 35's measure closer to 34's and so on. all depends on the brand
Hello, I got bigger tires and after a month or so my transmission stopped shifting, I have a 2017 wrangler, no transmission fault codes, bought a new transmission but still shift from 1st to 3rd only, do I need program the tires or do I need to change my axle gear?
I think you need to tell the ecu what size tires and gears you have with a flashcal or tazer or similar product. The speed sensors aren’t reading In Range where they should and it’s probably in limp mode.
I have a 1998 Grand Cherokee all-wheel drive I am changing my tires from 15 job to 16th do I need a bigger or little speedometer
The wheel size does not matter, what’s the actual height of the new tire? You also need to know your gear ratio in the axles
I changed my gear ratio on my 89 dodge d150. It's the same concept but I don't have the markers on the ring. So how do I know where to set it.
Without being able to see it I’m not sure how to help. It should be concentric just like the Jeep one where you rotate it to make it further or closer to the worm gear. Best I can tell you is if you have Instagram or Facebook look me up on there and send me some pictures otherwise that’s the best I can do
Greetings. I need help since my speed sensor has an electrical connection but it does not have to connect the wire so I do not know where it is connected
I dont really understand what you mean. the electrical connector sends a signal to the ecu
You seem to know your parts. I have a 1990 6cyl 5 speed and am trying to install a custom dash. I'm having a hell of a time trying to find a gauge to fit the speedo cable (slip on). All the gauges have threads. Is there a way I can switch mine to electronic to give me more gauge options?
Easiest would be a gps speedometer that doesn’t need a cable or signal. Otherwise you could use the newer yj sensor with the short shaft gear, you would
Have to run a wire
From dash down to it and maybe a ground and figure out which wire is the speed output n
Hi Dan, I have an 87 Wrangler I put larger tires on it. The speedometer jumps all over between 20mph and 40mph. Do I need a new cable or should I change gears like you just showed in the video?
Thank you, your video was very informative and helpful.
It might be clocked wrong(the housing that holds the gear), or the speedo itself could be bad.
@@FlawedOffroad okay, thanks!
I ordered a 29 and installed it when I put in the new tranny; however, it doesn’t work for some reason. Do I need to swap the shaft out of the old one?
Only if it’s different (short vs long)
I would check and make sure you got the sensor clocked properly(I show that in this video)
Where do you find the gears? I’ve looked everywhere I can think of and can’t find any
eBay, junkyard is my 2 sources. The “long shaft” gears from the older ones can also be found in old dodges dating way back to the 60s and maybe farther
Yep, I heard it click at about 12-14 flbs
Fabtastic
Is it the same for AX5 and AX15?
yep cause its in the transfer case, as long as its a 231 its the same(some variances on the speed sensor which I mentioned in the vid)
He body
My jeep has a lot of mods
4:10 gears
Atlas 2 tranfer case
But it doesn't read the milles or the speeds what can it be
Is your jeep 92 and newer? or 91 older? 1987-90 use a cable, 1992-95 use digital sensor. 1991 uses both like mine in the video.
If your sensor is in place, pull it out to see if theres a gear on there and if its clocked properly to mesh with the gears on the output shaft. if you have the cable version, it can come unhooked behind your speedometer so pull that out and check there as well. Good luck
I recently bought a 1995 jeep wrangler and the odometer and speedometer don’t work. In addition, the turn signal lights don’t come on on the dash. What do you think the issue is?
It is my understanding that the jeep did get reheated and has bigger tires but I am not sure if that would affect everything I just mentioned. Any help would be appreciated 🙏🏼
Other gauges do work
on a 95 there is no speedo cable, its all electronic. I would pull the dash cluster out and clean/check all grounds. They are notorious for getting corroded and gauges not working.
Amigo resiente mente e convertido mi cherokee Laredo 96 de automática a estándar pero ahora el sensor del velocímetro es diferente el de la estandar es de dos pines/cables y el de la automática es de 3 pines/cables cuáles son los que ahí que conectar para que funcione el velocímetro o ahí que cambiarle el sensor por completo
utilice el antiguo sensor de velocidad de su antigua transmisión y caja de transferencia
"google translate"
*Wish I knew what my brother geared his at. currently has 2 different sized wheels due to a blow out and the speedometer jumps*
Very bad idea to drive like that it can damage the diff and/or transfer case if the tires arent close in size. Go buy a used tire lol
@@FlawedOffroad dad had a blowout driving it home, couldn't be avoided at the time. Hasn't been driven since then honestly, until recently.
Can you do this for a 86 s10?
Maybe, do those use a 231c? I really not familiar with how gm does it but most of them had some sort of gear that can be changed
@@FlawedOffroad I’m new to building a truck. But the speedo is WAY off. So your video helped a lot. Thank you. I’ll have to do some looking at the truck to find what rear end I have.
I dont know my gear ratio! Any chance u could do a video on how to figure that out???
Well I could but it would be faster to tell you. Look on your differential cover for a tag, between the bolts. It will have some numbers on it 4 11 would be 4.11. 3 07 is 3.07 and so on.
If the tag is missing there’s 2 other ways to determine. The “spin tires” way or remove your diff cover. Gearset should have it stamped on there. The spin tires method has a few variables such as if you have a locker or not. Might be best to google that I’m sure someone on jeepforum has explained it better than I can.
To add to this, if you have a 2.5 5 speed it’s 4.10. 2.5 auto is 3.73.
The 4.0 came mostly in 3.07 auto and 3.55 manual but there’s a few variations so dont take that as gospel. This of course is assuming YJ, I can’t speak for tjs and xjs
I’ll tell you what, I didn’t have anything to make a video this week due to other projects getting in the way but I might be able to go out there this weekend and make that. Seems like a easy enough topic
@@FlawedOffroad I have an 89 yj with the 4.2 and a 5 speed. Just bought it. Not familiar with Jeep. It's had some work done but no info on what exactly
@M Mc I just made the video you requested th-cam.com/video/8N2npR2jCwU/w-d-xo.html
My bro's old Heep won't get past 40mph in 4th, what could cause that?
Well that depends on a lot, if its geared super low and has small tires, could be an issue with how its running, could be alot of stuff. please tell me he's not in low range on the transfer case lol
@@FlawedOffroad I'll need to go check that... I don't think it's in 4 low...
@@FlawedOffroad looks like 2h for normal driving.... idk if it's geared low, but 1st and 2nd are super short
@@STR8SICCC if you have a different transfer case like a twin stick Dana 300, some of them have 2wd low. Please refer to my other video about determining your gear ratio it takes five minutes to figure it out. I might have a link to it at the end of this one otherwise if you go to my channel it’s about four videos back from my newest upload
@@FlawedOffroad I'll check it out, according to the shifter knob there's 2H 4H N and 4L @the wayyy back
Your suppose to say "click click" when your elbow reaches the proper torque! lol
Im sure I said it in my head lol