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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > Tracking down driveline vibration. What is this noise?
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      10-13-2020, 10:02 PM   #23
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No idea if this thread will help or be a waste of time, but....

https://f87.bimmerpost.com/forums/sh....php?t=1492544

It takes quite a few posts to start narrowing this issue to the diff or diff bushings, could be worth a read.
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      10-13-2020, 11:16 PM   #24
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Mist likely diff. Probably ring and pinion setup is off.
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      10-14-2020, 11:25 AM   #25
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Mist likely diff. Probably ring and pinion setup is off.
That's what the dealer said too. I'm thinking it came from the factory that way. You'd think there would have been metal in the oil though.
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      10-14-2020, 11:34 AM   #26
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Quote:
Originally Posted by ZM2 View Post
No idea if this thread will help or be a waste of time, but....

https://f87.bimmerpost.com/forums/sh....php?t=1492544

It takes quite a few posts to start narrowing this issue to the diff or diff bushings, could be worth a read.
It's like I'm having deja vu reading through this thread. Thank you!

I have an appt with my shop on the 26th. I'm lucky, the dude there bought a spare M LSD for my car when they were on that ridiculous sale. So finding one isn't the hard part any more.
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      10-27-2020, 06:47 PM   #27
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Update...

Differential is the sole cause of the vibration/noise. My shop has another in stock - I proposed I should not have to pay for it considering the one I was sold was defective, though I am willing to pay for labor (not too much in the grand scheme of things).

He responded that he wants to talk to the BMW dealer they bought it from first, and go from there. This would have been fairly easy if the damn thing weren't discontinued.

Will keep you guys in the loop.
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      10-28-2020, 04:13 AM   #28
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Man that sucks. Have them manually check the backlash on the crown and pinion for the replacement. If everything goes south I can strongly recommend the Quaife - which is also "maintenance free"
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