Join Date: Mar 2002
Location: Austin, TX, USA
I believe Dave is on to something. Look underneith your car. There should be a "torque arm" connected between the rear end and the tail housing of the transmission. I've seen those torque arms get bent and throw the drive shaft out of alignment which would cause your problem. The proper drive shaft alignment is achieved when a line projected out the end of the transmission is paralell to a line projected out the end of the pinion. This way, both U-joints are bent at the same but opposite angles and vibration is cancelled.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI