Originally Posted by wiskeyVI

I did use Amoil.
The dealer that las looked at it said it DOES need additive even as Dodge says no.....

Took it to another dealer tonite and the service adviser was right on it as being rear end noise. She said that the clips holding everything in have a habit of breaking and letting the diff gears cant in the housing and that usually the houesing is ok.......

I think I may try to track down some Royal P im the AM, douche it all out with parts cleaner and try it again with heavier wt 75/140.

Backing up this PM sounded like there was a box of rocks in a crusher...could feel it throughout the truck. Put it gear and go straight, notheing.

Originally Posted by k5_blazerboy

Hate to sound like a know it all on my third post, additive will not help in the rearends, and as far as the service manager telling you the clips come apart, he is thinking of the tsb on 9.25 1/2 ton rear axles. No such clips on these units. These are internally all gear diffs, and seem to be fairly good. I've only seen one fail in our dealership, but we have done a couple of ring gear and pinions. I agree that they seem to be better than the Dana axles in everyway but the ujoints.