I'm excited by this series. I have not found many good videos (yet) on the web showing how to adjust backlash and how to torque the pinion crush washer to specs. Great start!
Hey Eric! A helical gear set is made up of a ring (or crown) gear and pinion whose rotational axes cross. It looks like what you've got is what's called a hypoid gear set, since their axes are offset from one another. It might seem pedantic, but they are actually very different in their design... besides, we're all here to learn!
The road to hell is paved with good intentions. I watched ETCG epic 8.8 videos recently, what a battle! I paid a gear shop to install 3.55 gears into my 1992 foxbody. And you know what...decades later when I sold the gearset that was taken out...they turned out to be 3.55's all along! Hope Eric can feel better after hearing this. Cheers!
Good vid Eric, lots of questions arise out of gearing! You said you bought those new but I hope you were confused cause they looked a little worn out, lol.
Thanks for that info, Eric. When I had a new custom Driveshaft put in, I noticed a whirring noise around 35mph. Do you think that my installer may have knocked my pinion out of wack, causing the noise?
I believe they're helical-bevel gears. But as with most tech as old as the cog itself, most combinations have been attempted. As a result, sets of varying gear types are labeled differently than the independent parts which make the set. Just as with a "rack and pinion" Basically 6 one way 1/2 a dozen the other
helica gears are the teeth slanted at an angle (heel to toe aren’t inline if that makes any sense) the reason why they shape them like this is for noise reduction
Hey Eric, my dad's 2006 Audi A6 has a problem with AC, driver side vents are heating while the passenger side vents are cooling... Any advice? BTW love your vids
Thank you so much ...I have question please my car turn 120km and rpm 3,5 engine 3000 v6 manual ger Galloper what is sort of corona which high speed better once you advice ?????
from what I understand, ring & pinions should always be replaced in pairs. As in when replacing one, like the ring, the pinion should also be. Like shoes, they are a matching set.
OK, I did my searching and now I have a question. I know about gear ratios from engine to transmission. I get that. I understand how they relate to the differential. What I don't understand is how the gear ratios of the differentials relate to performance. I don''t get the number. I think the number relates to the rotation of the drive shaft and I believe the top number, for example only, the ratio is 3:1, the top number is the rotation of the drive shaft the bottom the axle. And, if that is correct, how does that relate to performance vs just normal street driving. Would it be advantageous to have a say, 1:1 ratio for racing or for pulling tree trunk from the ground? Just wondering. I really couldn't find anything definitive. Thanks.
I can't wait to see your assembly video. I've had a set of 4.11's for about five years now and have yet to install them. I want to do it myself, but I'm nervous about messing it up. I haven't found many good videos about setting up rear diffs, but if anyone can give people the knowledge and confidence to do it themselves, it's you Eric!
As a formal greeting " Hello Eric The Car Guy" I can appreciate your dedication to educate; have seen quite a few of your videos . Just doing a Faced Hobbed 3.55 gear set on a Stang and came across your post. The original 5 cut faced milled gears versus the new edge 2 cut hobbed gear sets are pretty much the exact opposite when setting up patterns. I had to throw out everything I learned about setting up the face milled gears. Good point of figuring out gear ratio. Thank you for your dedication Take it easy...MBS
I know a wayyyyyyyyyyyy easier thing to when trying to figure out what gears you have in the back. Lift the rear end. Put vehicle into neutral Mark the driveshaft with a line. Mark the inside of your tire with a line. Spin the tire slowly Count the number of times the driveshaft does a complete 360 in relation to the tire Example. I have 3.73gears so my driveshaft spins 3.73 times for the tire to make 1 complete turn
I am just now taking a interest in gears & diffs. I have a very good understanding of engines. And a general understanding of differentials. I have built engines, but I have never built a diff. I have had a couple built. I have taken apart c clip diffs far enuf to change all the seals. Just never built one. I have a couple old trucks & one has a 8.8 in it & the other is a 10.25. Im thinking of welding the spider gears so they are locked. Would it be best to stick weld or mig weld?? I wasn't sure if they were cast gears or not?? Im curious what the rear-end dous if a weld were to ever break loose??? Is just open or dous it leave me stranded??
"Oliver"? Did you consult Richard Hammond from Top Gear UK about naming your car after the name he gave his car on the African road-trip episode? As a matter of fact Hammond's car was the same color as yours.
That's one of the reasons I chose the name. I also chose it because I seem to have similar affections for my car. If I run into Richard, I'll be sure to buy him a beer and perhaps throw him the keys so he can take it for a drive.
Literally just paid 1800 to have my whole differential assembly replaced. Now I’m still having issues when I break . The truck jerks and then when I was driving on the street it started to make that sound like it was about to break down again, I started pressing on the gas and it was going no where , so then I attempted to pull to the side of the road then it started working again. Call me crazy but I’m kind of pissed off right now
you didn't tell anyone about hunting and non hunting gear sets. if the gear set is timed and people put the gears into the incorrect gear teeth it will have a wine.
If most gear sets are face hobbed then just about all of these instructions and charts online are misleading people. For instance the pattern on the drive side is high on the face towards the heel and the instructions say to add shims to the pinion to move it closer to the ring's centerline. Here's the issue, those instructions are correct, but correct for face milled, not face hobbed. And those instructions are what pop up just about every time you do a search on ring and pinion patterns. Therefore assuming that just about everyone is using face milled gears not face hobbed like you say most gears are. This is important to me because I set up my rear and the pattern should have been close enough but over a few drive cycles started getting more noisy, after tear down I saw where the pinion is riding too high and too far back on the drive AND coast side so today I had to spend a good amount of time learning the differences in milling so I can adjust accordingly.
Mr. Eric if you currently have a good pinion bearing in a 8.5 Chevy but have serious slack in your carrier bearings can you just change out those bearings and use same shims and your done or do you still need to set backlash?
Should I cheap out on a ring and pinion set looks like I can get one for my truck on Amazon for around 200 bucks or I can get one off summit they’re set up looks better
A great way to remember that ratio formula in the correct order is, "Driven divided by drive". Say it out loud a few times - you'll never forget it. :)
I have had one vehicle with a 2.56 ratio and one with a 2.28 ratio. Those types of ratios were common before overdrive transmissions were the norm, outside of performance cars.
Eric have a quick question, have an 87 f150 with a manual 4 speed & wanted to change the gear oil but I can't see a drain plug for the life of me, any advice would be greatly appreciated, thx
Eric you said in the tear down video that high gears are stronger than lower gears. Cause then pinion gear is larger. What about with trucks and towing? Lower gears give you more torque. Usually trucks with lower ratio have higher towing capacity. Your thoughts?
What gear pinion set would you recommend for a 94 Chevy Silverado 350 with a TBI, I need more power on the high end. At 70 MPH I am at about 1400 rpms.
I have a set of OEM Ford 3.08s on standby, and the ratio is cast into the side of the ring instead of the face of the pinion. Just wanted to put that out there. I learned a LOT from this. Both the video and the comments.
Hey Eric! Im loving the series and just got through all the videos from the beginning. Have you ever looked at MSD atomic efi? Its like a Carbeurator but its an efi system and im pretty sure it can be programmed for boost, diff stages of nitrous and so on.
I had the differential rebuilt on my 84 Toyota Van at while back. Since then, it seems quiet when it's under load, but makes a whirring sound when I'm coasting.
Great video Eric, I hope your planning on keeping the exterior and interior of the car stock, maybe a quiet exhaust, keep all that power a surprise lol
Eric, I can't thank you enough, If I could give you more than one thumb up I would. Thank you for sharing your great knowledge and this and all your videos! Be safe, have fun and stay dirty my friend.
My father was a machine design engineer. He hated the Hypoid gears for the inefficiency they have(part worm gear). One of the good things about front wheel drive cars is NO hypoid gears.
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I'm excited by this series. I have not found many good videos (yet) on the web showing how to adjust backlash and how to torque the pinion crush washer to specs. Great start!
That video starts Friday. ;)
LMR.com has a good video on how to do it.
Weber Auto youtube channel has good vids too
Hey Eric! A helical gear set is made up of a ring (or crown) gear and pinion whose rotational axes cross. It looks like what you've got is what's called a hypoid gear set, since their axes are offset from one another. It might seem pedantic, but they are actually very different in their design... besides, we're all here to learn!
It is. I got that part wrong.
great info erick I loved it straight to the point no fluff.
I like a little bit of fluff. 😁
You want to tell us all that about differential gears? Well that's just your pinion bro.
Nice :-D
I'll PINion him down for you!
WreckDiver99
These puns are really starting to grind my gears.
Maybe you need to shift your thinking a bit.
WreckDiver99
Do you think that would have a *bearing* on my attitude?
The road to hell is paved with good intentions. I watched ETCG epic 8.8 videos recently, what a battle! I paid a gear shop to install 3.55 gears into my 1992 foxbody. And you know what...decades later when I sold the gearset that was taken out...they turned out to be 3.55's all along! Hope Eric can feel better after hearing this. Cheers!
More videos of DIFFERENTIAL please. Interesting topic.
Thanks Eric. Great video short, concise and to the point. Great for us who suffer from ADD : )
@EricTheCarGuy im going to need a part number on that black t shirt... it just looks comfortable
Good vid Eric, lots of questions arise out of gearing! You said you bought those new but I hope you were confused cause they looked a little worn out, lol.
True that. Yea, they were new, just covered with rust inhibitor is all.
The 8.8 on my '96 f150 just leaked all the gear oil out, now she howls & clanks, already have a new rear end to throw under there when she goes
Thanks for that info, Eric.
When I had a new custom Driveshaft put in, I noticed a whirring noise around 35mph. Do you think that my installer may have knocked my pinion out of wack, causing the noise?
Great video Eric
Eric you said those were helical gears. Correct me if I'm wrong (which I usually am lol) but aren't those really hypoid gears?
I believe they're helical-bevel gears. But as with most tech as old as the cog itself, most combinations have been attempted. As a result, sets of varying gear types are labeled differently than the independent parts which make the set. Just as with a "rack and pinion"
Basically 6 one way 1/2 a dozen the other
helica gears are the teeth slanted at an angle (heel to toe aren’t inline if that makes any sense)
the reason why they shape them like this is for noise reduction
Eric thanks for all your videos ,,BTW what brand ring gear and pinion do you buy ?
Hey Eric, my dad's 2006 Audi A6 has a problem with AC, driver side vents are heating while the passenger side vents are cooling... Any advice? BTW love your vids
Thank you so much ...I have question please my car turn 120km and rpm 3,5 engine 3000 v6 manual ger Galloper what is sort of corona which high speed better once you advice ?????
Can you explain to the public the difference in Gear Ratios and The Benefits and Disadvantages
High gears=high speed at low rpm but slow take off. Low gears=faster take off but compromise top speed.
+EricTheCarGuy is there a sweet spot to get them both ?
that all depends on the power output of your motor and what you want the car to do
Hey Eric, I want to know..Will there be a loss in spider gear in differential due to it's free rotational movement?
from what I understand, ring & pinions should always be replaced in pairs. As in when replacing one, like the ring, the pinion should also be. Like shoes, they are a matching set.
Yes, exactly.
well done Eric!
Tell us about the limited slip portion of it.
Great explanation!
OK, I did my searching and now I have a question. I know about gear ratios from engine to transmission. I get that. I understand how they relate to the differential. What I don't understand is how the gear ratios of the differentials relate to performance. I don''t get the number. I think the number relates to the rotation of the drive shaft and I believe the top number, for example only, the ratio is 3:1, the top number is the rotation of the drive shaft the bottom the axle. And, if that is correct, how does that relate to performance vs just normal street driving. Would it be advantageous to have a say, 1:1 ratio for racing or for pulling tree trunk from the ground? Just wondering. I really couldn't find anything definitive. Thanks.
I can't wait to see your assembly video. I've had a set of 4.11's for about five years now and have yet to install them. I want to do it myself, but I'm nervous about messing it up. I haven't found many good videos about setting up rear diffs, but if anyone can give people the knowledge and confidence to do it themselves, it's you Eric!
This is why I'm a huge fan of this channel. Eric the car guy always has critical and very usefull info. Thanks Eric.
As a formal greeting " Hello Eric The Car Guy" I can appreciate your dedication to educate; have seen quite a few of your videos . Just doing a Faced Hobbed 3.55 gear set on a Stang and came across your post. The original 5 cut faced milled gears versus the new edge 2 cut hobbed gear sets are pretty much the exact opposite when setting up patterns. I had to throw out everything I learned about setting up the face milled gears. Good point of figuring out gear ratio. Thank you for your dedication Take it easy...MBS
Good to know
I know a wayyyyyyyyyyyy easier thing to when trying to figure out what gears you have in the back.
Lift the rear end.
Put vehicle into neutral
Mark the driveshaft with a line.
Mark the inside of your tire with a line.
Spin the tire slowly
Count the number of times the driveshaft does a complete 360 in relation to the tire
Example.
I have 3.73gears so my driveshaft spins 3.73 times for the tire to make 1 complete turn
I am just now taking a interest in gears & diffs. I have a very good understanding of engines. And a general understanding of differentials. I have built engines, but I have never built a diff. I have had a couple built. I have taken apart c clip diffs far enuf to change all the seals. Just never built one. I have a couple old trucks & one has a 8.8 in it & the other is a 10.25. Im thinking of welding the spider gears so they are locked. Would it be best to stick weld or mig weld?? I wasn't sure if they were cast gears or not?? Im curious what the rear-end dous if a weld were to ever break loose??? Is just open or dous it leave me stranded??
"Oliver"? Did you consult Richard Hammond from Top Gear UK about naming your car after the name he gave his car on the African road-trip episode? As a matter of fact Hammond's car was the same color as yours.
That's one of the reasons I chose the name. I also chose it because I seem to have similar affections for my car. If I run into Richard, I'll be sure to buy him a beer and perhaps throw him the keys so he can take it for a drive.
QUESTION::::can you ever use the pinion with another ring or do the always have a set pinion and ring???.? Hoping for an answer...thanks
Literally just paid 1800 to have my whole differential assembly replaced. Now I’m still having issues when I break . The truck jerks and then when I was driving on the street it started to make that sound like it was about to break down again, I started pressing on the gas and it was going no where , so then I attempted to pull to the side of the road then it started working again. Call me crazy but I’m kind of pissed off right now
you didn't tell anyone about hunting and non hunting gear sets. if the gear set is timed and people put the gears into the incorrect gear teeth it will have a wine.
Why have these two manufacturing styles (milled/hobbed) of gears for differentials?
Is there different applications/purposes for each type?
Captain Obvious analysis here, but damn, Eric you know a lot about cars. Impressive.
I could still learn a whole lot more, but thanks.
I'll be happy to share my personal knowledge about differential gears: They are a PAIN IN THE ASS.
Good day Eric, what is the ratio on a Toyota Hilux LN166 rear differential and on a Toyota YN106 4×4?
If my new pinion shim says 2.452 what measurement is that in? I don't know what measurement I'm using inches mm, cm,
If most gear sets are face hobbed then just about all of these instructions and charts online are misleading people. For instance the pattern on the drive side is high on the face towards the heel and the instructions say to add shims to the pinion to move it closer to the ring's centerline. Here's the issue, those instructions are correct, but correct for face milled, not face hobbed. And those instructions are what pop up just about every time you do a search on ring and pinion patterns. Therefore assuming that just about everyone is using face milled gears not face hobbed like you say most gears are. This is important to me because I set up my rear and the pattern should have been close enough but over a few drive cycles started getting more noisy, after tear down I saw where the pinion is riding too high and too far back on the drive AND coast side so today I had to spend a good amount of time learning the differences in milling so I can adjust accordingly.
Mr. Eric if you currently have a good pinion bearing in a 8.5 Chevy but have serious slack in your carrier bearings can you just change out those bearings and use same shims and your done or do you still need to set backlash?
Should I cheap out on a ring and pinion set looks like I can get one for my truck on Amazon for around 200 bucks or I can get one off summit they’re set up looks better
Comment numebr 2! Cheers eric, no one will ever beat the 1950s Pathe film about diffs though
That was a brilliant way to learn :-D
That is a good film.
BTW it's linked in the description.
A great way to remember that ratio formula in the correct order is, "Driven divided by drive". Say it out loud a few times - you'll never forget it. :)
HI Eric, when you take the dial reading for backlash you take it on the drive side or coast side?
Did you study engineering? As a mechanical engineering student, they didn't go into this much depth into gears.
Awesome stuff Eric! :)
That was good...you have the rare ability of simplifying good info for all to grasp what you are saying... Liked the video too, gonna sub..
isn't a 2.7 final drive super low? like pretty much only good for coasting on the highway?
yeah provides low rpm for better MPG.
2:73 is actually considered a high gear. 4:11 would be a low gear but you have the premise correct.
4:10s in my S2000 eric :)
I have had one vehicle with a 2.56 ratio and one with a 2.28 ratio. Those types of ratios were common before overdrive transmissions were the norm, outside of performance cars.
had 4.40 in my old EM1 haha that thing was at 4k doing 70mph
Thanks for the PDF Eric. I'm not sure if I'll ever swap gears or axles but it's good info to have on hand.
We make these at our plant! Both gears we process. We heat treat the pinion gear, and cut the ring gear. Thats funny ahah!
Eric have a quick question, have an 87 f150 with a manual 4 speed & wanted to change the gear oil but I can't see a drain plug for the life of me, any advice would be greatly appreciated, thx
Eric you said in the tear down video that high gears are stronger than lower gears. Cause then pinion gear is larger. What about with trucks and towing? Lower gears give you more torque. Usually trucks with lower ratio have higher towing capacity. Your thoughts?
Trucks have larger gears to begin with.
What gear pinion set would you recommend for a 94 Chevy Silverado 350 with a TBI, I need more power on the high end. At 70 MPH I am at about 1400 rpms.
Sooo what's way to go to go faster. Big question I need answered
I don't recall. Was this the rear out of the pony? Or out of Oliver? 2.73 sounds more like what the fairmonts had in them.
I got this differential from Pull-a-Part. Separate from both cars. The rear in the Mustang was hacked up pretty good and I couldn't use it.
Eric, I need to know who makes the best pinion gear sets as i have to rebuild my 98 Dodge Ram rear end w 3.55 ratio. Who are your top 3 please
I have a set of OEM Ford 3.08s on standby, and the ratio is cast into the side of the ring instead of the face of the pinion. Just wanted to put that out there. I learned a LOT from this. Both the video and the comments.
What brand do u recommend for a 2017 Gmc 3500 hd . Yukon, us gear , g2 etc.....iam putting 4.56
Very nicely done Eric. continue this great stuff. Stay DIRTY... Angelo
Hey Eric! Im loving the series and just got through all the videos from the beginning. Have you ever looked at MSD atomic efi? Its like a Carbeurator but its an efi system and im pretty sure it can be programmed for boost, diff stages of nitrous and so on.
Id be keen to see a video about re shimming a viscous style LSD if that could happen some time in the future!
I still have the old differential. I hope to to a break down video of that at some point.
Wow, excellent... especially the part about figuring out the ratios. I never got that but do now! 😁
I had the differential rebuilt on my 84 Toyota Van at while back. Since then, it seems quiet when it's under load, but makes a whirring sound when I'm coasting.
I had that problem with my ford 9" after I put my factory gear back in. I had to adjust the pinion depth by a hair and the noise went away.
The shop that rebuilt it said they put everything back into spec too.
I think the backlash is set a little to loose and that's causing the gears to whir when coasting.
what if i use 1:1 gear ratio on ring & pinion gear ratio. ?
What would cause a differential to explode or be noisy? What aspect of setup would cause those results?
awesome
Another thing to mention is the lower the gear ratio the less teeth on the pinion gear and the weaker the pinion gear gets
Eric, I've never seen a calculator that dirty.
Diff gears or just gears in general, are craazaay
Great video Eric, I hope your planning on keeping the exterior and interior of the car stock, maybe a quiet exhaust, keep all that power a surprise lol
Great short video - GOOD Info! Thanks!
LOL 13 hour ago WTF?!!
korai kiadás .... egyesek az tudja ... néhány várni kell ...
Eric, I can't thank you enough, If I could give you more than one thumb up I would. Thank you for sharing your great knowledge and this and all your videos! Be safe, have fun and stay dirty my friend.
You're most welcome. Thanks for the comment.
Eric, those are actually spiral bevel gears, not helical gears.
What combination transmision and deferential to 4dr5 engine.
My father was a machine design engineer. He hated the Hypoid gears for the inefficiency they have(part worm gear). One of the good things about front wheel drive cars is NO hypoid gears.
Hypoids are noisy as well within certain ranges. Ford's 3.73 and Toyota Tacomas have em and everyone bitches about bad differentials.
Good info. Thanks nigga
WTF? 8 hour ago??LOL
Early release for us premium etcg members
David G WELL......:((
Ratio is stamped on the ring gear.
Nicely done.
A lot of technical information in a concise format.
I just cleaned up and painted my nine inch diff for my '64 Tbird. Been really thinking of saving for disc brake conversion.
Do it. It looks so cool when it's done.
Hi Eric, how to change gear ratio for higher torque?
Just installed 4.10 on my n/a cobra and it made a huge difference. Woked the car up and it pulls hard .
same here on my ls1 it's a world of a difference, pulls hard!
Learned a lot from this video. Thank you
Could your watermark be smaller, Eric? Anyway, great videos, keep up the work!
No.
Nice so your not just a pretty face lol :)
are aftermarket covers such as afe beneficial?
Your gearing down for low gear torque, rubber say byeeee :).
No... That noise is generally because reverse is a straight cut gear in the transmission.
Ahh thanks for the understanding :-D, Godfreys pun wasnt that bad lol.
Probably.
How to know the piston position in cylinder?
That's great info, Eric. Many thanks for that.
MOAR of this differential topic
oliver?? lol
But they are interesting
Great video Eric 👍🏻
What does 8.8 refer to
♥️♥️♥️♥️
Thanks Eric.
nice thanks
good info Eric
I have 3.42 common in gm
thanks for the vid!
Ughhhhh lowwww pinyon
awesome!