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Unread 02-26-2013, 02:28 PM   #1
Bravo1782
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Jeep YJ Rear Axle Upgrade Options

Hey guys, just finished paying off my wheel\tire upgrade on my axles. In this thread, I want to ask you guys about where to start on the rear axle. The D35 on the YJ has a history of bad problems, so I realize a direct swap makes the most sense. That said, swap with what? A D44? Ford 8.8? If so, from what vehicle. I plan to put a locker of some sort, but what makes the most sense? A LSD, soft locker, or hard locker? Re gearing is inevitable, so what gear ratio?

I'm not a serious mudder or rock crawler; my YJ is primarily an expedition vehicle, that is, I take it off-roading mostly to get to places to camp, and then spend the weekend wheeling around getting to places. I don't plan to climb up mountains with it. What do you guys think? What the best and most cost effective route?

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Unread 02-26-2013, 02:30 PM   #2
giggityjeeper
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read this has been covered, beat to death, and covered again, 8.8 and 44 are ver close in strength..... 8.8 from a 95 up explorer gives u disc brakes and is with an inch i beleive of bein the same width.... its the most common really...

start reading
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Unread 02-26-2013, 02:52 PM   #3
NHfireLJ
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SOOO MANY OPTIONS AND OPINIONS..,

Do some research.... search different lockers. search 8.8

You need to research first and then come back with specific questions
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Unread 02-26-2013, 03:08 PM   #4
zeus87gn
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I used a Chrysler 8.25 from a Cherokee - It was available when I went looking and all ready ready to bolt in (spring perches already moved)
Some say its not any better than the D35, but XJ drivers don't have any problems...even up to 35s

As far as the internals -> Detroit TruTrak

JMHO
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Unread 02-26-2013, 03:24 PM   #5
imstillatwork
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Imagine a horse that died of unknown causes. Cause is irrelevant anyways. Point is, the horse died. Day after day, for the better part of 10 years, passersby proceed to beat the crap out of said horse. With each beating clearly more meaningless than the previous. Our subject- the horse- is now a bloody pool of putrefied flesh pounded into a pulp.

All kidding aside,
Start here. This is probably the most complete set of pages regarding YJ axle swaps
http://bit.ly/Yypdx1
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Unread 02-26-2013, 05:28 PM   #6
calvynandhobbs
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Like said above, this has been beat to death, but just as an FYI, neither the 8.8 or D44 are direct bolt in. There is fabrication to be done with anything that didn't already come under a YJ. What you can look for that would be a direct bolt in is a "Super 35" already built. I picked up a "S35" with 4.88 gears, Detroit locker and truss with a matching D30 front axle with 4.88 gears and Lockrite for $500. I don't know if the 35 will last, but it was worth the gamble. He was going up to tons so I had to give it a shot.
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Unread 02-26-2013, 05:31 PM   #7
Ripper3494
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8.8 is your easiest most covered swap. strong as hell thick tubes, big gear and heavy shafts. just cut all original mounts off and weld on new spring perches. then get a new u joint that fits for both the axle and your jeep and your done...

if your know what your doing (ie. research) and you have the parts you need (2 spring perches and a new u joint) the swap can easily be done in under 2 hours
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RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 02-26-2013, 08:01 PM   #8
linusb
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Not sure what tire size you have, but if running 32-35, Find a 4.10 geared LSD 8.8 out of ford explorer Eddie Bauer ( or sport model also has I think). Pretty easy swap. Cost you to tune of 300-400 bucks if u can find someone to do free welding/labor to help you.

Find a complete Dana 30 with same gearing, put an auto locker in it. Total Cost maybe 400 bucks.

Sell your old axles...recoup maybe 150.

With this setup you'll have a very capable rig on and off road - on the cheap!
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Unread 02-26-2013, 09:48 PM   #9
Bravo1782
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Thanks, LINUSB....and everyone else. I guess I should have been a little more specific with my original post...I was hoping to get some insight from some YJ guys that have done these swaps, wheeled them, and came back with an overall assessment on how it went.

I think the biggest thing for me is going to be what I can find and what parts are available...I feel like (from what I've seen) there's FAR more options for a D44 than a 8.8 as far as gears, diff covers, lockers, etc...but maybe I'm just looking in the wrong places...I'll just keep my eyes peeled on what turns up at scrap yards.

Here's another question for you guys: Regearing: should I DIY or drop the note to get someone else to do it, if it comes down to that. It seems involved, but then again, so did installing an SYE, until I actually did it and looked back thinking "well hell that wasn't bad." What do you guys think?
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Unread 02-26-2013, 10:07 PM   #10
Anticanman
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There is almost as much aftermarket support for the 8.8 as the 44 because of two reasons:
1) the 8.8 never came in a solid steering axle
2) the vehicle which the 8.8 came was rubbish from the factory.
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Unread 02-26-2013, 10:20 PM   #11
rambo3489
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Look into a 9" too. It's the big brother of the 8.8. Much stronger design. Wonderfully tuff design. But has drum brakes. Convertable to discs for some money. But if you are not looking for a heavy duty axle if go 8.8. Easier and better option of the two.
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Unread 02-27-2013, 07:06 AM   #12
soonermatt
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You didn't give budget requirements but did talk about buying something used. You could look at some Rockwell axles out of an old military surplus Kaiser truck. You might be able to find some Eatons out of an old city dump truck. I don't think you'll have to worry about strength with either of these options. They should hold up on the trail going to the camp site like you mentioned.
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Unread 02-27-2013, 07:25 AM   #13
Ripper3494
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Quote:
Originally Posted by soonermatt View Post
You didn't give budget requirements but did talk about buying something used. You could look at some Rockwell axles out of an old military surplus Kaiser truck. You might be able to find some Eatons out of an old city dump truck. I don't think you'll have to worry about strength with either of these options. They should hold up on the trail going to the camp site like you mentioned.


Probably sent from under my broken heep
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1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
[url]http://www.jeepforum.com/forum/f12/alternator-welder-write-up-1301614/[/url]
my tj 1/2 doors on a yj write up
[url]http://www.jeepforum.com/forum/f12/tj-uppers-yj-half-doors-hard-top-installation-1417686/[/url]
RC vs BDS
[url]http://www.jeepforum.com/forum/f12/rough-country-vs-bds-1461555/[/url]
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Unread 02-27-2013, 09:58 AM   #14
StanF
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Quote:
Originally Posted by Bravo1782 View Post
snip

I'm not a serious mudder or rock crawler; my YJ is primarily an expedition vehicle, that is, I take it off-roading mostly to get to places to camp, and then spend the weekend wheeling around getting to places. I don't plan to climb up mountains with it. What do you guys think? What the best and most cost effective route?
What size tires are you running?

Axle replacement might be your best option...

For your use case, you might want to consider upgrades to your D30/D35 instead. Read this thread for info on what another guy did:

http://www.jeepforum.com/forum/f9/ex...hafts-1234745/
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Unread 02-27-2013, 10:29 AM   #15
jeepster93
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Quote:
Originally Posted by calvynandhobbs View Post
Like said above, this has been beat to death, but just as an FYI, neither the 8.8 or D44 are direct bolt in. There is fabrication to be done with anything that didn't already come under a YJ. What you can look for that would be a direct bolt in is a "Super 35" already built. I picked up a "S35" with 4.88 gears, Detroit locker and truss with a matching D30 front axle with 4.88 gears and Lockrite for $500. I don't know if the 35 will last, but it was worth the gamble. He was going up to tons so I had to give it a shot.
This.
The only direct drop in for a YJ is the one it came with. There is NO junk yard axle that will bolt under your Jeep without modding that you don't already have.
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