69 Barracuda Clutch Shake Help Needed.

How is it in reverse?

Perfect in reverse. You can stomp it going backward and no chatter at all. Takes right off. I've worked on/restored Mopars only for 40 years and haven't ran into this situation. I'm a bit stumped at the moment. When I measured the pinion angle last night I did it on the u joint and left it bolted to the pinion. I'm going to drop the drive shaft off and measure pinion only tonight after work. But as I said my 71 measured close to the same in that same spot. I had a shop check the clutch PP fingers to bearing and just in general. All looked good to them in the clutch area. Local Napa did resurfaced the pressure plate before new clutch install. Maybe something up with that as suggested earlier in the thread.