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Suspension & Braking Forum by BimmerWorld
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Old 05-08-2013, 07:36 AM   #1
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Join Date: Dec 2012
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My Ride: BMW E46 328i 1999
Differential bushings?

Lately i hear a banging sound from my trunk, it sounds like if theres someone on my trunck knocking hard trying to get out... It sounds when the car is stoping of when i just let go the gas pedal.. Someone told me it could be my differential bushings, could that be it? How do they look like? Where to buy them and if possible, how to instal them?
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Old 05-09-2013, 02:53 PM   #2
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I would inspect your subframe to make sure it isnt torn. When mine was bad, it sounded like a golf ball was rolling around in the trunk during take-offs and hard shifts.

I believe the test for worn differential mounts is to apply the e-brake and have someone slowly release the clutch (in 1st) while watching the diff bushings from behind. If they are worn, you will see quite a bit of movement or hear chattering. I would research the procedure before trying though.
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Old 05-15-2013, 01:07 AM   #3
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You could perform that same test with the foot brake as well, the goal is to hold the wheels still, eliminating their displacement in the driveline, forcing something else to move. Is the car an automatic? If the noise only occurs during stops and starts, my thoughts go straight to the torque converter.
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