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Old 03-13-2011, 04:05 PM   #1
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Clunks When stopping and go...

Everytime I take off or slow down I hear a clunk and the rear tires kinda shutter. I've changed the u joints and tranny mount. What other things should I check. It's also got an ox locker in the rear with upgraded axle shafts. Let me know what you think.

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Old 03-13-2011, 05:09 PM   #2
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First thing I'd do is remove the rear tires. Inspect the brakes, rotors, then start pulling on control arms. Try to wiggle the driveshaft and trackbar. If everything seems alright, get those rears on the front, front tires to the back. Still doing it?

That takes care of the easy part. If you still haven't solved it, it's time for a full on axle inspection, most likely a bent shaft or something. I'm pretty sure you'll find what's up when you inspect the brakes or check suspension components. I'm thinking it's a CA or trackbar loose

EDIT: you can also lay under the Jeep and have someone rock it and bounce it around. See if they can reproduce the clunk and follow your ears

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Old 03-13-2011, 05:46 PM   #3
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Its on a 94 YJ also. 4.0.L. Probably would make a difference
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Old 03-13-2011, 05:57 PM   #4
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I hopped under there and nothing seemed loose except track bar or sway bar or whatever you wanna call. Wasn't really worrying about cause I hear people taking those completely out all the time. But that might be causing the noise.. But would it cause the tires to shudder?
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Old 03-13-2011, 06:12 PM   #5
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Yes, leaf spring YJ's don't require a rear trackbar. But...if it's lose it will clunk, and if your axle is shifting side to side, it'll create the illusion of tires moving.

Take it off and give the Jeep hell, or tighten it up. See what happens. DO NOT do this with coil suspensions though if a TJ or JK person is reading this. CJ and YJ suspensions are different animals.
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Old 03-13-2011, 06:48 PM   #6
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Thanks for all ur help buddy. I'll tighten it and see what happens
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Old 03-13-2011, 07:01 PM   #7
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You're welcome. Report back here with how it went
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Old 03-14-2011, 07:31 PM   #8
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The track bar wasn't the problem.. The bushings were worn out so I took it out anyway. The problem is as soon as you let of the clutch and give power to the driveshaft the rear axle will turn upwards. So um guessing I should invest in some new u bolts since that would be the only thing keeping the axle from shifting up right? The old ones won't tighten without heating up then I would risk the chance of snapping them. Let me know what u think.
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Old 03-15-2011, 03:22 PM   #9
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Could possibly be CA's too. If you found play in those bolts though I'd start there.
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Old 03-15-2011, 03:34 PM   #10
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By CAs you mean control arms or what?
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Old 03-15-2011, 03:39 PM   #11
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Yes
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Old 03-15-2011, 07:27 PM   #12
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I didn't notice any control arms in the back.. Just leafs, shocks, track bar, and u bolts.
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Old 03-15-2011, 07:44 PM   #13
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Well then we're getting into thick water. Replace your u-bolts. If it still clunks, grab a shock. If it's not loose…

Time to open the differential

EDIT: you'll want to take the cover off. Look for slop anywhere. It might help to have someone get in the Jeep and shift to reverse or 1st to make things move a little
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Old 03-15-2011, 07:49 PM   #14
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Pay extra attention to your locker/spiders
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Old 03-15-2011, 07:57 PM   #15
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You know, I'm sitting here thinking...might be a longshot but here goes....

You running a spare? See if it's loose or rocking around too
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Old 03-15-2011, 08:02 PM   #16
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Sounds like the U-bolts. Had the same thing with my CJ years back. If not, the leafs could be really weak. Long shot I know. Just trying.
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Old 03-15-2011, 08:04 PM   #17
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No spare. Sounds about right on the u bolts.. The axle is rotating up under power. U bolts would be the only thing keeping the axle from rotating up correct?
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Old 03-15-2011, 10:36 PM   #18
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I think that's it. Some say it's bad to re-torque u-bolts claiming they stretch when torqued and everything else. True? I dont know. Just something I've heard.

Personally, I'd torque the old ones down. If it loosens up again, get new ones.
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Old 03-16-2011, 09:24 AM   #19
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I agree. I had lock nuts on mine and just tightened them up, all was fine. If you cant get them to move and its still a little loose, cut them off and get new one. They are not too expensive.
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Old 03-24-2011, 06:57 AM   #20
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Finally got the u bolts.
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Old 03-24-2011, 07:00 AM   #21
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Replaced them and now it finally runs nice and smooth!

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