Car has been making this noise for a couple months now and only happens while turning right. Never left or straight, at least it is absolutely no where near as noticeable. I checked tire clearance and that's not it and nothing is rubbing at all on the rear end. But it seems to be intermittent. Groan, groan, groaaaan groan groan. As the thing turns. I recently have changed my rear end fluid to check and see if the diff was making any noise and to just check it out and see how it looks ( seemed to look fine and wearing nicely).Could it be the traklok

 

Bad bearings would be my guess.

 

did you add 4 oz of friction modifier??

 

Yep. And added the correct amount of fluid as well.

 

clutch pack may be worn, disassemble and inspect