rubbster

My ring and pimion os bad. Thats whats causing the noise. Just never have changed rear end gears before. Any advise?

91familyxj

Find someone who knows how to do it. I would get a master kit and try it my self but you can screw it up fast if not done right.

xjoffroad

x2

rubbster

Got ther gears done and still have the issue(

Throttle Jockey

then i guess that wasnt the problem. what was the original issue?

rubbster

A clunk when letting of gas when moving and shifting into reverse it clunks very loud at times but not always

EMAXX620

Did you check the u-joints on the driveshaft?

rubbster

Changed the u joints. Ths is driving me crazy

ca441970

My 99' does the clunk when it is shifted from park to reverse to drive, but only after it is hot though. It makes a thunking sound and you can feel the truck move with the clunk. Pretty annoying. It's been doing it for a couple years. I was waiting for the rear diff to just crap out, then I will R&R it(Chrysler 8.25), but it seems to just stay the same, it hasn't gotten any worse... I have not replaced my Ujoints yet, but I doubt they are the problem. My rear seal has a little leak too, but the fluid is within range.

Jeep, Ride XJ

mine clunks too. out of park into reverse and into drive. i aint figured it out my self.

ca441970

I even took it to a Jeep guy, he said the transfer case is fine, put it on the lift and there was "minimal play" he said... He said drive it till it pops, very reassuring!!! I drove it from MA to FL like that, and no issues, that was almost 2 years ago. I just try to ignore it. I am gonna yank out the joints this winter though.

Caish

I doubt this is it, but for the sake argument, check the torque convertor bolts/nuts and make sure they're tight.
I've seen them come loose make the engine sound like its knocking, but never just one clunk so I doubt its the issue but still can't hurt to check em.

rweaver138

Sounds like the tranny's clunking to me.

ca441970

Nope, mine is definitely the read diff... Tranny never clunks. I have play in the rear diff.

rweaver138

u-joints in driveshaft, maybe a bad bearing in the rear end