Rear Rumble on E28

[Richbauch@xxxxxxx]

I just had my driveshaft rebuilt, new diff. mount installed, and new tranny 
mounts installed. I now have a constant rumble/vibration at all speeds from 
the rear end.

I've never done the rear sub-frame bushings or dog-bones. Could they cause 
vibrations? It kind of feels like the rear suspension is not working properly 
and I'm constantly feeling every imperfection in the road. Very annoying.  
Any advice is appreciated!

thanks,
richard
87 535i 200,000 miles 5-speed 

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