2500HD 4X4 transfer case chain question...

[cosmiccowboy]

There seems to be a lot of 2500HD owners in here...I've got a question for you...

I drive a 2001 and take care of it...I have 155K on it and it has been pretty bulletproof but I'm getting a new noise I don't like...

when I back up and then stop and go forward I'm getting a "clunk" that sounds like a bad yoke/u-joint but it's not...I recently had u-joints changed and drive shaft balanced...everything is tight...

I am suspecting its a stretched chain in the transfer case...anyone else had this? Is this a major deal to fix? How much did it cost to fix?

I'm not a "mudder" and basically use the 4WD to keep from tearing up ranch roads (back when we used to get rain)

Just curious if anyone else has had this problem..

[Double D]

I also have an 01 2500 HD 4x4 and have the same noise. I have asked a few of the local mechanics about it and nobody can give me an answer. I myself would like some info on this issue.

[cosmiccowboy]

I also have an 01 2500 HD 4x4 and have the same noise. I have asked a few of the local mechanics about it and nobody can give me an answer. I myself would like some info on this issue.

Process of elimination on mine it almost has to be in the transfer case. If you haven't done yoke/u-joint check on yours you might want to start there...we have long drive shafts and no carrier bearing and my rear u-joint was about done at 150K.

[cosmiccowboy]

BTW, it wasn't bad...at the driveshaft specialty shop I went to it was about $140 with tax to drop the driveshaft, balance it, and put in new u-joints. thats a whole lot better than throwing a rear u-joint at 70mph and thrashing your truck. That can get really ugly.

[Mike D]

Probably just starting to get wear in the ring & pinion. Also not sure if they have a thrust bearing but could also be the problem. And lastly, believe it or not weak springs can cause that due to excessive movement caused by axle wrap.

[Feederwatcher]

you would'nt feel slack in the transfere case unless you were in 4wd.......my 02 duramax does it too ! I always felt like it was excess gear clearance in the rear diff.
I know of several gm's that have this very issue and it has not progressed passed an annoyance to date.


FW

[cosmiccowboy]

hmmm...OK...glad to know I'm not the only one but it bugs the heck out of me not knowing what it is...