69 Barracuda Clutch Shake Help Needed.

TimS said

I should have specified. What I measured about 5 degrees negative was the drive shaft angle toward the pinion as it was still hooked to the yoke. I unhooked the drive shaft from the rear pinion and rotated the pinion yoke around so I could attach the magnetic angle finder to it. I got 2 degrees positive that way. I'm going to do the same thing with my 71 Cuda and make sure I see a difference. That car has an 8 3/4 with 4 speed, and if I'm doing this right, should be negative at that spot. The 71 does not chatter. Just comparing.

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So , with the car up on jack stands located under the rear end. You measured 2 degrees positive for the rear end pinion centerline? (pointing upward towards motor).

What is the angle of the transmission centerline? You will need to know this to determine the relation of that angle to your pinion angle. Under full throttle, they should be offset, but parallel. At rest, the pinion angle should be pointing down a few degrees in relation to the transmission centerline angle to allow for the upward rotation of the rear end under power.