92 YJ clunk when not loaded - JeepForum.com
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post #1 of 4 Old 02-25-2021, 03:27 PM Thread Starter
Jeepchicken
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92 YJ clunk when not loaded

Hello looking for some help with my 92 YJ. It has developed a clunk coming from the rear end whenever the drivetrain is not being loaded from the engine (ie in neutral or slowing down in gear) that is consistent with vehicle speed. As soon as gas is applied at any speed the clunk completely disappears until you let off the gas again. Driveshaft and ujoints are fine and it doesn't matter if the vehicle is in 2wd or 4wd. Opened up the differential and found a very small amount of backlash between the pinion and ring gear. I didn't use a dial indicator to measure but it seems pretty tight. There is definitely some play in the spider gears but I'm not sure if that could be causing it or not. Other than that everything looks good on visual inspection. I have read that a clunk consistent with vehicle speed could be the result of damaged teeth on the pinion or ring gear but as I said everything looks great.

Please let me know if you have any ideas. Thanks.

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post #2 of 4 Old 02-25-2021, 08:23 PM
Joe Dillard
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Have you checked the shock mounts and tracbar mounts yet?

How's the tranny mount?
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post #3 of 4 Old 02-25-2021, 08:30 PM
bruinjeeper
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Quote:
Originally Posted by Joe Dillard View Post
Have you checked the shock mounts and tracbar mounts yet?

How's the tranny mount?
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post #4 of 4 Old 02-26-2021, 05:39 AM
fishadventure
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Pinion bearing or carrier bearings are possibilities in my mind.
When loaded it can be quiet, ‘rattley’ while unloaded (coasting). Might not even be a problem per se.

[size=3]Shackles & D-rings are different things.
Cranking IS turning over
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