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Old 08-01-2011, 08:11 PM
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catso catso is offline
Location: Chicago
Join Date: Dec 2009
Posts: 3,112
Mein Auto: 2000 323i, 1988 528e
Originally Posted by Ataglance View Post
My differential mount is broken. The bolt is gone, probably broken out because of rust.

When it broke it caused the rear end to vibrate and make a noise that sounds not good. Now the drive axle and differential are sagging and actually resting on the exhaust.

I was wondering if the mount is replaced and the differential/drive axle reconnected would the vibration stop or is there likely lasting damage as a result of the broken mount?

Also what size is the bolt in the mount?

Any experience is greatly appreciated. Thanks in advance.
Go to and look up the appropriate diagram. It will have a corresponding parts list that will tell you what size bolt you need. Your questions about vibration will be answered when you replace the differential mount. Take a close look at the other rear problem areas: subframe mounts, lateral links (dogbones), trailing arm bushings, rear shocks and shock mounts. Anything made of rubber deteriorates over time and can contribute to vibrations and noise.
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