please confirm my pinion shim math

[monster man]

after my lift I measured my pinion angles, the output yoke on the rear driveshaft is right at 6 degrees more angle than the rear pinion yoke (because of the shackle flip), so I'll want to shim the pinion DOWN exactly six degrees? Then they will be in the same plane- or should I only go four so that my drivehsaft doesn't extend all the way out?

and on the front the driveshaft angle is 10 degrees off of the pinion angle. So, I will only want to shim the pinion UP five degrees, that way it will bring the pinion up five and the driveshaft up five so that it will be straight inline with my u-joint?

and since they only sell them in 2, 4, 6 degrees should I go with the 4 degree on the front?

thanks

 

[BigCountryx]

I'll be waiting for more input, but I don't think you'll be able to shim your front axle that much due to changing you caster setting.

 

[monster man]

hopefully I'll be able to get away with more shimming since I used the ORD extended heavy duty shackles. They're not that much longer but it said they do make a difference in caster, so if I can just bring it back a few degrees I'd be happy. Maybe 2.5?