I just finished installing 3.90 gears in to my 94 A4 10bolt. The problem i am having is that when i left off the gas and turn the steering wheel towards the right while making a turn, the rear end makes a weird grinding noise. And the farther towards the right i turn the louder the noise gets. It sounds like the posi unit but I'm not sure. And this only happens when making right turns while the car is decelerating. Does anyone know whats happening or how to fix it?? Any help or comments would be great!!
Thanks

 

Did you use the GM LSD additive when you filled it back up?

 

Yes, i did put in the GM LSD additive when i put it back together.
Does anyone else have any other ideas??