Rear differential roar :(

[yiipi]

Hi 2 u all. I have problem with roaring/wining sound in my rear end. When the car is in motion and when it's on load sound does not exist, but when I pass over ~100kmph and put car in neutral with or without pressed clutch I got this roaring sound. Also when I start moving I got some kind of knock sound in rear end. My subframe is on solid poly bushings but I was getting these sounds before changing these bushings. Any idea what is producing sounds? My chassis is S13 with CA18DET engine and 5 speed manual transmition with open diff. Tnx in advance.

[Sileighty_85]

Bearings are fucked as well as possible incorrect Back lash set.

Mine roared like crazy as well turned out I broke two teeth off the pinion gear and the metal shaving destroyed the bearings

http://i73.photobucket.com/albums/i235/Neil_85/Photo0547.jpg

[yiipi]

I've changed all of the bearings inside it, but what about back lash, is it possible that the back lash set went incorrect from long use time (wear of something)?

[KiLLeR2001]

Best thing to do is pull it out, pop off the front cover and inspect the diff. per FSM.