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Unread 04-18-2013, 09:30 PM   #1
Ctputtters
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1994 ZJ 
 
Join Date: Apr 2013
Location: Houghton, MI
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Grinding in rear only under load

Hello all,
This is my first post, I've seen a few other threads that have similar problems but they weren't quite the same and they haven't been updated for years.

I have a 94' that I bought VERY used. 260k, I've been swapping parts here and there but I have a bad grinding now.

The grinding is coming from the rear. It sounds pretty centered, but it could be either (or both?) of the bearings. The interesting part is that the grinding only occurs when I'm at the bottom of a gear. When the car is coasting or under a lighter load, there is no grind. When I'm at the bottom of a gear and there is more of a load, it grinds like crazy. It doesn't seem to be in any way connected with speed, as whenever I coast it is quiet.

My shop thought it was a bad bearing, but I'm not sold on that one.
I checked the u-joint, and there isn't any play. I'll take another look when I can get the wheels off the ground again because I'm really hoping it's just this.

Any ideas will help.

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Unread 04-18-2013, 09:45 PM   #2
biggoofy
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Get a new axle from a jy it will be cheaper.
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Unread 04-18-2013, 09:50 PM   #3
Ctputtters
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1994 ZJ 
 
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Quote:
Originally Posted by biggoofy View Post
Get a new axle from a jy it will be cheaper.
Cheaper than what? What do you think is wrong with it?
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Unread 04-18-2013, 10:11 PM   #4
PolkaPower
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Bearings of some sort. That is the worst title to a post in a long time
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Unread 04-18-2013, 10:24 PM   #5
Ctputtters
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Quote:
Originally Posted by PolkaPower View Post
worst title to a post in a long time
First post, I'll get the hang of it eventually :P. This thing is so full of problems, I'll be back for something else in a month, I'm sure.

For now I'm going to grab some new bearings and a new u-joint. Even if they aren't the problem, I should probably have new ones after 260k anyways.
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Unread 04-19-2013, 06:14 AM   #6
biggoofy
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It's a d35 don't waste money go get a 44a from a 96-96 v8 zj and put it in.
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96 ZJ HP44 / 9"
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RIP Troy aka BigBlueZJ94

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[URL="http://www.mallcrawlin.com/forum/showthread.php?22776-Biggoofy-s-96-ZJ-build!-**Building-axles**"]My Build[/URL]


Need quality parts call Andy at Ironman4x4fab!!!!!
[url]http://ironman4x4fab.com/index.html[/url]
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Unread 04-19-2013, 07:47 AM   #7
PolkaPower
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He's right. If the carrier bearings are gone then a bolt in upgrade would be a D44a from a 96 and up V8. It it's just the wheel bearings then it's a relatively cheap and easy fix. But it could be the pinion bearing too. Kind of a pain to diagnose. You will have to figure out if the rear drive shaft will fit though. The 44a is a little longer than the D35c. You may want to grab the rear shaft too.
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Unread 04-19-2013, 11:35 AM   #8
ratmonkey
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It is most likely the pinion bearings if you're sure its coming from the rear.

Which transfer case do you have?
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Unread 04-19-2013, 07:03 PM   #9
durango-bob
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Be care on an axle swap if you go that way. You need to make sure that the gear ratios are the same.

And if you need specific info on a project, here is a couple of links that may help:

On-line factory service manual: http://www.jeep4x4center.com/knowled...?utm_source=cj

Step by step directions and other tech: http://www.stu-offroad.com/
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