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Old 07-23-2010, 09:50 AM   #1
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Rear U-Joint?

Okay so before replacing things that I don't need to replace, I may as well ask first. Any time I am starting off strong just after going in reverse or rolling backwards, I hear a clunking/popping sound coming from what I belive is the drive shaft. It does it strong enough where it rattles the jeep. This is the only time it does it and it shortly goes away once I get going. Would this be a bad U-joint? I have yet to climb under and see if the DS is loose at all.


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Old 07-23-2010, 10:09 AM   #2
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Jack the rear off the ground to get the vehicle weight off of it, then see if there's excess play in the Rear DS u-joint at the rear pinion and also check near the T-Case output.

If the rear seams fine, then check the front drive shaft

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Old 07-23-2010, 03:34 PM   #3
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A lot it could be.

DS slip splines, DS u-joint, T-case output, DS slip yoke, Axle shaft, Carrier, spider gears, R&P, wheel bearings, Control arms, CA bushings, broken CA mount/bracket, tranny mount, shock bushing, shock mount, broken bolt in any of the above, etc.

Start there and see if any of those work............good luck.
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Old 07-23-2010, 03:39 PM   #4
Knows a couple things...

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Keep in mind too that the driveshaft has a certain amount of normal rotational play in it from the backlash (slop) between the ring & pinion gears. That normal amount is enough to alarm a lot of newer Jeepers.
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Old 07-23-2010, 05:50 PM   #5
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Well I know the sound is coming from the back end and it only happens every once in awhile. Crappy weather is preventing me from looking more into it right at the moment.
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Old 07-23-2010, 06:09 PM   #6
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Quote:
Originally Posted by lancetkenyon View Post
A lot it could be.

DS slip splines, DS u-joint, T-case output, DS slip yoke, Axle shaft, Carrier, spider gears, R&P, wheel bearings, Control arms, CA bushings, broken CA mount/bracket, tranny mount, shock bushing, shock mount, broken bolt in any of the above, etc.

Start there and see if any of those work............good luck.
You forgot about the track bar as well.
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Old 09-23-2010, 05:08 PM   #7
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Dont wait to long cause that little problem can turn into a bigger problem it is a easy fix if it is a u joint.

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