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Weird driveshaft vibration/knocking 535i (archive)

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Posted by Galt on January 13, 2001 at 16:10:55:

86 535i automatic.
when its cold, and i accelerate slowly away, i get a vibration and a knocking sound, it sounds like its coming from the tunnel directly below the handbrake area. it also does it when i am slowing down, and get to about 5 mph. it is a distinct mechanical knocking, like something is actually hitting against something else.
The odd thing is that once the car is fully warmed up, it goes away.
Any thoughts? Thanks!

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