My old center diff from my audi 200, this was a part of the problem of drivetrain having a lot of play thus making an annoying noise when changing the gear, removing load after acceleration and so on. The problem was severe before, there is still some sound, but it is on an acceptable level. Unfortunately I did not have a chance to put my hands on replacement diff (i got a used but OK unit), now it is in the car so I am not able to compare it
