how do i measure pinion angle for shims?

[shaved80]

i asked on fullsizechevy.com with no response...maybe someone here can help out.

one thing i noticed though, is it only vibrates if i accelerate slowly, not at a faster than normal speed

[DnStClr]

I think you're more interested in the drive shaft angle. They can be checked with an inclinometer.  Does this site help?
www.drivetrain.com/driveline_angle_problem.html  

[roundedline]

Put an angle finder on the output shaft yoke and take a reading and them put it on the rearend input shaft and take a reading.  Technically they should be the same.

The reading for the pinion angle should be between 1 and 4 degrees down from the driveshaft.  Optimumly it should be 3-4 for a leaf setup.

Chris Lucas
www.73-87chevytrucks.com
www.captkaoscustoms.com
Project Su
Jimmy 2WD Project

[DnStClr]

Have you checked the U- joint for looseness?