Like sentinal said. I have 3.5"s of lift and run 1 inch shackle. 8° shims worked perfect for me. Best way to do it is to go out and buy a cheap angle finder for about 10 bucks, measure the pinion angle, then measure the driveshaft angle. They should be identical, assuming you have a cv shaft, and are still running the dana35. If you are running an axle with any sort of offset, different degrees are necessary.
/l , [____],
Mud is your Friend :)
Please help keep our trails clean for future generations to enjoy outdoor recreation as well!