Rear end moan

MagnitudeBruce · 04-02-2007, 07:57 PM

On cold starts, making a hard left turn at very low speeds, I get a low-frequency moaning coming from the back of the car. It doesn't do it to the right. After a few minutes of driving and it's warmed up, the sound disappears. My mechanic says it's a worn plate in the diff($$YIKES$$) and will get worse over time. Others say it's probably a worn rear bearing. But the mechanic says that would be more of a ratcheting sound. Anyone experienced this?

bmwm3smg2 · 04-04-2007, 01:01 PM

Definitely not worn bearings. You'll hear that constantly specially when turning. Not sure about which model years were affected but there was a TSB about differential fluid change to fix a few diffy noise complaints.

MagnitudeBruce · 04-06-2007, 03:53 PM

Thanks for the info. Definitely a good start. I'll give the dealer a call and check on service bulletins. Hope it's as simple as that.
- Bruce

04-02-2007, 07:57 PM	#1
MagnitudeBruce MagnitudeBruce Drives: E46 M3 Join Date: Apr 2007 Location: NYC Posts: 3 iTrader: (0)	Rear end moan On cold starts, making a hard left turn at very low speeds, I get a low-frequency moaning coming from the back of the car. It doesn't do it to the right. After a few minutes of driving and it's warmed up, the sound disappears. My mechanic says it's a worn plate in the diff($$YIKES$$) and will get worse over time. Others say it's probably a worn rear bearing. But the mechanic says that would be more of a ratcheting sound. Anyone experienced this?
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04-04-2007, 01:01 PM	#2
bmwm3smg2 Second Lieutenant Drives: E46 M3 Join Date: Mar 2007 Location: NJ Posts: 188 iTrader: (0)	Definitely not worn bearings. You'll hear that constantly specially when turning. Not sure about which model years were affected but there was a TSB about differential fluid change to fix a few diffy noise complaints. __________________ Erwin

04-06-2007, 03:53 PM	#3
MagnitudeBruce MagnitudeBruce Drives: E46 M3 Join Date: Apr 2007 Location: NYC Posts: 3 iTrader: (0)	Thanks for the info. Definitely a good start. I'll give the dealer a call and check on service bulletins. Hope it's as simple as that. - Bruce