vibration

[daveo11]

I have a bmw 330 ci, 2001. I have a vibration in the rear end at 60 and above mph.
Was wondering if anyone had an idea what is causing it?
I have tried 3 different sets of wheels and tires, same vibration every set.

[TostitoBandito]

Does it only occur under power, only while coasting, or both?

Could be tons of things. Diff, wheel bearings, or any number of things in the rear suspension. Check your rear shock mounts too.