[Reyals Bemus]

For your consideration, the pinion doesn't really "climb" under torque in these trucks because of the trailing arm suspension design. Unlike leaf sprung rear ends, the axles in our '60-72 C10s are positively mounted to the trailing arms. They cannot twist or wrap up like leaf sprung axles. The only pinion angle changes that occur is under normal suspension travel, but due to the inherently long trailing arms, the angle change is, again, minimal.

All said, I like to set mine up close to 0 or 1 degrees (no more than that) in these trucks. Smooth as buttah!