After dropping in a new block from E32 into my E34 I'm having pretty big vibrations on motor/transmission which indicate some sort of flywheel issue to me.

Fly wheel/transmission is out of 540I/6 speed and we resurfaced it, etc.

Are the flywheels interchangeable between the two engines? I'm thinking since M60 is an M60 there would be no difference and this just might be a result of a badly resurfaced flywheel?