The noise doesn't really go away I'm hoping it's just the last of four bearings but it feels like some vibration/noise below me (driver ) indicating drive shaft or transfer case.

It's subtle I will check the dfferential asap. I want to remove the bottom plate to get a good look to squash the oil leak problem with that car. I did not notice oil on the inner side of the right CV after I replaced it but if it was gear oil not engine oil that could be the cause of the noise as it does sound gear-y. (but don't notice a difference power on power off or neutral for that matter). My copy has no drive train noise at all. I can hear wind and tires when I'm driving that's it. Wife's car I hear a subtle moan. It was howling and I determined it was the bearing. A second time also bearing. Third time I changed the suspect bearing and the sound wasn't much different but I was starting to get a vibration in the steering wheel which disappeared. I only have one more original bearing remaining so I'll preemptively replace that but also check the dif oil level (and suck out a bit to examine). Thanks for the feedback I actually wasn't aware the differential used gear oil I thought with the 8 Qt capacity the car used engine oil for the differential.

I have winter tires on the car that have the less than desirable effect of sounding just like a worn bearing at slow speed but wife and I have identical tires and my car doesn't have the drive train sounds wife's car has.

I'm thinking I'll put a remote camera/mic under the car to see if can determine the source before it ever becomes more than subtle


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)