Rear axle for 90 YJ - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 11-18-2007, 10:58 AM Thread Starter
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Rear axle for 90 YJ

Hi, I'm over here from the toyota board on behalf of a friend. We need to know what models/years are suitable rear axle donors for a 90 YJ. Direct fit is what we want MINOR mod may be OK. Please explain if ANY modding needs to be done. Thanks in advance.

Alright! Who put the "S" in lisp?
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post #2 of (permalink) Old 11-18-2007, 12:18 PM
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90 YJ came with a leaf sprung Dana 35...It is crap. Barely strong enough to trust street driving or mall crawling the Jeep. If your friend is only in need of a stock replacement, years 87-95 are the same.

There is no 'bolt in' swap. There were no available upgrades from Jeep that will fit without some work.

You can look for a Dana 44 out of a TJ (97 and up) then cut off the coil suspension cups and weld on leaf spring perches. Or if you want to get fancy. Pull the whole suspension off a TJ and go coils on the YJ. You will also need a new driveshaft as the snout on a d35 is longer than a D44.

A Ford 8.8 out of a 96 and up Explorer is a very worthwhile swap, especially if your friend is gonna be wheelin' the Jeep. The 8.8 is just an inch or so narrower, has the same lug pattern, and adds disk brakes. Again you will need to weld on new perches (the Ford perches are about 3/4 inch off) and replace the rear driveshaft.

Do a search on this forum...Lot's of information on the strength (or lack thereof) of the D35, on the 8.8 swap and converting to a TJ d44.

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post #3 of (permalink) Old 11-18-2007, 12:23 PM
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8.8= best bang for the buck in my opinion. seen them beat and never a problem. Sure folks have broken them, but I have seen broken rockwells to.

Ya only go around once, best to enjoy it the first trip.
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post #4 of (permalink) Old 11-18-2007, 10:30 PM
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What about an 8.25" out of an XJ? Wouldn't that pretty much "bolt-in" or are the perches on the wrong side of the tubes?

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post #5 of (permalink) Old 11-19-2007, 05:48 AM
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8.25 is not much stronger than a D35 and will require new perches anyway.

A bad weekend of wheelin', is still a good weekend.
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post #6 of (permalink) Old 11-19-2007, 08:54 AM
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The easiest upgrade would be a d-44 out of an older XJ. They had a metric ton option and while they are a bit rare, they bolt right in.

EDIT.
actually, the shock mounts are a tad different.the XJ mounts are parllel to the axle, the YJ is perpendicular.

any axle is pretty easy to swap into a leaf sprung rig..

It's not what you have. It's what you do with what you have

Last edited by elusive; 11-20-2007 at 08:28 AM.
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post #7 of (permalink) Old 11-20-2007, 06:59 AM
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A pretty easy swap would be a D44 out of the rear of a Grand Wagoneer. They are within an inch or so of the same length, and the bolt pattern is different. That can be corrected with modification to the D30 on the front. You will need to weld on new pearches, but you are going to have to do that no matter what.

What is this Jeep going to be used for. If it is a street Jeep, getting another D35 is the easiest, and cheap. You can generally find them free.

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post #8 of (permalink) Old 11-20-2007, 10:36 AM Thread Starter
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So 87-95 YJ's are the only direct fit axles? This vehicle is just needing to be operational so it can be sold. One of the spiders must be faulty, it seems to skip a tooth when accelerating and making a turn. Does not while held straight.

Alright! Who put the "S" in lisp?
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post #9 of (permalink) Old 11-20-2007, 11:42 AM
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If it's just to make it saleable, take it apart and put spiders in it. That will be cheaper, easier and cause fewer headaches than trying to do a swap. And three fourths of the people who might buy it will mark it down if it's got a non-stock axle.

EVERYTHING's easy for the guy who doesn't have to do it.
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post #10 of (permalink) Old 11-20-2007, 11:43 AM
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Quote:
Originally Posted by man2mal View Post
So 87-95 YJ's are the only direct fit axles? This vehicle is just needing to be operational so it can be sold. One of the spiders must be faulty, it seems to skip a tooth when accelerating and making a turn. Does not while held straight.
Better followup on that guess before spending to much time on it... swapping the spider/side gears is easier/quicker than swapping an "unkown" axle.

Who knows? You may find a LSD w/o additive... will sound/act like somethings broken or maybe a locker that's just clunking

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