AS I have yet to modify my MM, I have found a few tricks to help when those " just gotta see what you got, guys are around. I lock up my brakes, put the trans in 2nd, with o.drive out, get the rear wheels smokin' ( not too much) and let er rip ! This way, I am already about half way to H.P range, and although it gets second gear rubber, its not too much as to loose time. I have no trouble with the Pony cars or Camaros that I am giving away 70 C.I. to anyway. Its very frustrating to have this " bad" drive shaft in the car. I personally think that ALL MM owners make Mercury put in a new shaft abd chip at THIER cost. Hell, the advertise the MM as the muscle car of the future, yet its limited from the factory with negitive performance parts.
Jim Williams
Ft.Worth,Tx