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

 

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.

 

x2

 

Got ther gears done and still have the issue(

 

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

 

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

 

Did you check the u-joints on the driveshaft?

 

Changed the u joints. Ths is driving me crazy

 

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.

 

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

 

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.

 

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.

 

Sounds like the tranny's clunking to me.

 

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

 

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