Quote:
Originally Posted by TassieBMW
My E90 with around 100,000 miles has a decent thud in the driveline at the rear end coming on and off the throttle as whatever is loose takes up slack.
Under some conditions like coming off a light throttle application it also causes a weird jerking back and forth sensation.
I already previously successfully addressed the cowbell noise with a new guibo and CSB, however the CV joint is still original.
To me, it seems like this should be a differential bushing failure, but looking at them from beneath the car they don't look to be obviously beat up or cracked.
What other things could be a likely cause of this?
Internal diff gear wear, engine mounts, subframe mounts, etc?
TIA
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Failed driveshaft coupling center bearing.