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Old 05-06-2011, 03:18 PM   #1
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Tranny "clunk-clunk" noise from Reverse to Drive

Hey all-
Got a used 07 Sahara automatic with 45k miles on it and starting to notice when I am in reverse, then place it in drive, I get a "clunk-clunk" sound. Jeep is totally stopped when I shift from R to D and it seems to do it when I accelerate which leaves me to think it may be a U joint going out? I changed the Diff fluid via the drain plug less than 3k miles ago. No other issues with the tranny that I hear or feel when shifting. Any thoughts?

Thanks!

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Old 05-06-2011, 03:39 PM   #2
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Sounds like your driveshaft is about to crap out..

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Old 05-06-2011, 04:44 PM   #3
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Could just be a u joint. Check underneath for looseness in the area of the drive shaft.
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Old 05-06-2011, 05:44 PM   #4
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To all-
Thanks for the suggestions...I just crawled underneath and the rear drive shaft will not budge, but the front one will move about 1/4 inch. Sounds seems like it is coming from the rear. Since I am not in 4 wheel drive the front DS should not matter...correct?
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Old 05-06-2011, 07:06 PM   #5
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Also check the transmission mount, I had that issue a while ago on an old camaro, might as well just do a thorough inspection while you are there.
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Old 05-06-2011, 07:09 PM   #6
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I'm with Kolector. Classic symptoms of a bad U joint. It will do it under load. That's why the sound is from the rear.You're not going to be able to tell trying to move it with your hand. It has to go on a lift. I'll put heavy $ that it's a bad U joint.
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Old 05-09-2011, 11:01 PM   #7
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Thanks guys...one last question. This is my first JK and I have had a YJ before...but I do not see any zirk fittings anywhere along the drive shaft or u joint so...how do you grease them? YJ's were so much easier to maintain!! Sorry if the question is stupid, but I am new to my JK and learning as I go and do not know how the previous owner maintained it.

Thanks!
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Old 05-09-2011, 11:27 PM   #8
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They are sealed you can't grease them
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Old 05-11-2011, 01:08 PM   #9
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I had a similar issue with my ex's Commander, I had her crawl under and smear the rear U-joint with bearing grease and the noise hasn't been back. That was about 20k miles ago.

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