Most all M6 Z's have the shakes at 80 or so until you balance the driveshaft or get a new one.

 

My A4 had the shakes at higher rpm going "fast"... after a new tranny.. the vibes are all gone now Not sure what it was but im glad thats fixed.

 

Mayyyyybe, the disk clutch and flywheel were outta whack and the vibration was ONLY amplified when it was all directly connected? That would/could make sense since I can see the original factory grind (after getting it reground) next to one bolt hole, but 180 deg`s there was a deep depression before I had it ground down!?!? No depression now, but your telling me it can be turned .10/.20 and still not touch one of the edges?? Never heard/thought of anything like that before. Crazy man, just crazy!!


You know what else?? I still can`t belive its ABSOLUTLY NOT butter!!!