Noise at rear differential - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 08-01-2007, 12:35 AM
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Unhappy Noise at rear differential

I have this noise coming from the rear differential only under load and
at pretty much between 40-50 mph .when i remove my foot off the gas
pedal ,the sound goes away .
i'm pretty much sure it's not the wheel bearing or the guibo flex coupling.
it sounds like something is out of balance .
Can anyone suggest which bearing would make that noise?
or common bearing noise?
Any advice would be much appreciated ?
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#2 (permalink) Old 08-01-2007, 02:31 PM
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If it sounds like a "CLUNK" or "BANG" noise, then you have prolly broken the diff bolt. Its a very common problem.

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#3 (permalink) Old 08-01-2007, 03:26 PM
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Quote:
Originally Posted by muk5
I have this noise coming from the rear differential only under load and
at pretty much between 40-50 mph .when i remove my foot off the gas
pedal ,the sound goes away .
i'm pretty much sure it's not the wheel bearing or the guibo flex coupling.
it sounds like something is out of balance .
Can anyone suggest which bearing would make that noise?
or common bearing noise?
Any advice would be much appreciated ?
If the noise is steady under load and constant crusing but goes away when you lift off the gas its probably the input bearing in the nose of the diff.
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