I've never had any vibration issues from the drive train even at the top end of the track (109mph).

Pinion is down about 4*, there is a slight offset between the transmission and 9" yoke but its like 1* or less. Shaft is about 60" long from memory.

Rubber mounts around.

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them