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Old 07-26-2014, 03:32 PM   #1
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4.10 rears for 89yj

I know the 4 cylinders have 4.10 rears but what years would I be looking for on craigslist/junkyard if I want to put them on my 89 yj 4.2 and is it a exact replacement ?

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Old 07-26-2014, 04:23 PM   #2
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I don't believe there is a difference between the D35's with different gearing. The only thing different about them should be internally, the ring and pinion. I'm thinking that it's possible that rear driveshaft could be different, because the Ax-15 and Ax-5 are different lengths, therefore the T-Case would sit back further/closer. Maybe someone can verify this.

If you help me swap out my D35 with 4.10's for my 8.8 that I have in my garage, you can take it lol But all 4-Cylinders with Manual Trannys should have the 4.10's, not sure about the Autos.

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Old 07-26-2014, 05:50 PM   #3
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I don't believe there is a difference between the D35's with different gearing. The only thing different about them should be internally, the ring and pinion. I'm thinking that it's possible that rear driveshaft could be different, because the Ax-15 and Ax-5 are different lengths, therefore the T-Case would sit back further/closer. Maybe someone can verify this. If you help me swap out my D35 with 4.10's for my 8.8 that I have in my garage, you can take it lol But all 4-Cylinders with Manual Trannys should have the 4.10's, not sure about the Autos.
Yes all if this is correct info lol All manual 4bangers had 4.10 and the year does not matte as long as it's a D35. I would also recommend getting the front gears for the D30 while you're there.

Also check for Cherokees with 4 bangers less common but the gears will still work
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Old 07-26-2014, 08:07 PM   #4
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Not too up to date on axle terminology for 4.10 front and rear I need D35 rear and D30 front ?
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Old 07-26-2014, 11:12 PM   #5
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You have a D35 rear and D30 front now. But you need the gearing to match to use the 4wd. So you'll need a D35 rear with 4.10 gearing and a D30 front with 4.10 gearing.

What Zack was saying was that while you grab the rear axle with 4.10 gearing, you should grab the front axle with 4.10 gearing as well. You could upgrade the ring and pinion you have now in your front Dana 30, but for less work and way less expensive you can swap out the front axle while you're swapping the rear out.

Technically, (technically), you could change just the rear D35 to 4.10 gearing, but you would not be able to put it in 4wd until you make the front D30 4.10 gearing as well. So if you find a good 4.10 rear see if you can get the front as well.
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Old 07-26-2014, 11:15 PM   #6
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Correct if it's it's got 4.10s in the rear then chances are it's got 4.10s in the front
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Old 07-27-2014, 01:10 PM   #7
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Following 100% and have already been contacting ppl to find two working axles everyone has the fronts!!! No rears yet thanks for the help
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Old 07-28-2014, 01:00 PM   #8
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Following 100% and have already been contacting ppl to find two working axles everyone has the fronts!!! No rears yet thanks for the help
Same here man no one has anything. I think I'm going to get an XJ D30 and 8.8 and call it good
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Old 07-29-2014, 12:56 PM   #9
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I'm selling the ring and pinion out of my d30 if your still looking lol
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Old 07-29-2014, 09:38 PM   #10
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Hello Zack, Here is my Jeep details: 1989 Wrangler, 4.2L inline 6, Carb and 5 Speed manual.
Are you sure it's a 4.2? Is it a stroker? I6s are 4.0.
Other wise if it's a 4.0 and manual then it's got 3.07 gears which suck. You can get buy on 31s on 3.07s. Only thing that sucks is you have to be going about 60 to get into 5th nice thing is that 80 is about 2300 rpms which IMHO is the sweet spot for the 4.0 on the highway
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Old 07-29-2014, 10:08 PM   #11
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Are you sure it's a 4.2? Is it a stroker? I6s are 4.0. Other wise if it's a 4.0 and manual then it's got 3.07 gears which suck. You can get buy on 31s on 3.07s. Only thing that sucks is you have to be going about 60 to get into 5th nice thing is that 80 is about 2300 rpms which IMHO is the sweet spot for the 4.0 on the highway
yjs came with a 4.2 i6 also
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Old 07-29-2014, 10:13 PM   #12
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yjs came with a 4.2 i6 also
Say what?? I didn't know that learn something new everyday. Then honestly I can tell you for sure what ratio yours has. Check on the rear axle for a ratio tag
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Old 07-29-2014, 10:50 PM   #13
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Zack, not to be a smart azz but , you need to read up on YJ's, in the beginning they ALL had 4.2s.
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Old 07-29-2014, 11:24 PM   #14
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I had an 87 YJ with the 4.2 I6, 4:10's and 31's. The thing was an absolute tractor. I could barely hit 65mph, if you drive a lot on the highway you may not like it.
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Old 07-29-2014, 11:28 PM   #15
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Say what?? I didn't know that learn something new everyday. Then honestly I can tell you for sure what ratio yours has. Check on the rear axle for a ratio tag
Yep and they had 3.07's with a manual also.


The 4.2 was heavily underpowered due to all the emissions bs. People have said they lost 30-40hp when the emissions stuff choked them down. From cj era to the YJ They had 10 drabs less Tq then the 4.0 but it's peak was 1800 vs the 4.0 at 3000. My YJ has more low end grunt then my XJ and the XJ has 3.55's and 33's and my YJ is on 35's with 3.07's I installed a weber 38 carb (400cfm) gm hei ignition and a 2.5" catback with hiflow cat on mine and it really woke it up.
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Old 07-30-2014, 02:15 AM   #16
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Zack, not to be a smart azz but , you need to read up on YJ's, in the beginning they ALL had 4.2s.
Not to be a smart azz nubz but XJs and MJs had 4.0s so I just assumed they were the same and then ask/ admitted when I didn't know. So why are you on my ass? Do I have two girlfriends now? At least I was trying to help the OP by trying to figure out what gearing he had, to see how it would work with his 31s. And not posting worthless (not him) comments. This would have been a great PM, "Hey man in the beginning they all had 4.2s here's a little article for you to read." And my response would have been "oh cool thanks man. I just got a YJ but it's my 3rd jeep. I know a decent amount about the XJ plat forum but not so much about the wrangler plate forum. Thanks again!" But hey what do I know.


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Yep and they had 3.07's with a manual also. The 4.2 was heavily underpowered due to all the emissions bs. People have said they lost 30-40hp when the emissions stuff choked them down. From cj era to the YJ They had 10 drabs less Tq then the 4.0 but it's peak was 1800 vs the 4.0 at 3000. My YJ has more low end grunt then my XJ and the XJ has 3.55's and 33's and my YJ is on 35's with 3.07's I installed a weber 38 carb (400cfm) gm hei ignition and a 2.5" catback with hiflow cat on mine and it really woke it up.
Very informative, thanks. So the 4.2 was in the CJ so that's why they used it the YJ? Then after the emissions crap bogged it down they switched over to the 4.0?
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Old 07-30-2014, 04:05 PM   #17
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With 33s 4.10 will be good or it's going to be screaming right now with stock I'm at 65 mph all emissions deleted not sure it the cat is clogged that's next step but I'm shifting between 3rd and 4th never in 5th so should I put in the4.10 axles ?
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Old 07-30-2014, 04:32 PM   #18
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With 33s 4.10 will be good or it's going to be screaming right now with stock I'm at 65 mph all emissions deleted not sure it the cat is clogged that's next step but I'm shifting between 3rd and 4th never in 5th so should I put in the4.10 axles ?
Put them in! if 4.10 is too much, put some 35's on next and you'll be great
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Old 07-30-2014, 04:38 PM   #19
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Ok maybe I'm thinking to hard bout it or I'm just stupid to gearing but with 4.10 will it be a all around daily driver ?
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Old 07-30-2014, 04:50 PM   #20
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Just another option, but if you save up a bit.. you can get a ford 8.8 to swap in.. does require welding new spring pads/mounts etc.. but you end up with a far better rear axle.. and they came with 4.11/10 gears...
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Old 07-30-2014, 06:59 PM   #21
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Ok maybe I'm thinking to hard bout it or I'm just stupid to gearing but with 4.10 will it be a all around daily driver ?
I had 4.10 with 33's and the same engine as you and it was my daily driver. The gearing is a bit deep, but city gas mileage and mountain driving was great. Highway I only cruise at 55-60 anyway so it still did good. With 33's, 4.2l, and a manual, the ideal gearing I'd guess would be 3.92, but 4.10 is close enough. I have 4.56 gearing now with 35's and wish I kept the 4.10 gearing.
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Old 07-31-2014, 01:35 AM   #22
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Sounds exactly like what I want thanks for the good info

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