Air shocks and Pinon Angle.

not as much as you would think...the trans does go up but the pinion angle is the difference between the output shaft and the yoke. If you drop the rear down with equal length springs and risers on all 4 points it will stay in the same relative plane as it was when it was normal drive height, BUT none have equal length spring with all being longer in the back, as well as the shackles in the rear so your pinion nose will swing up in relation to the output shaft. Upon acceleration it will wrap up opposite the wheels so it will be even more "positive". Not real good. Generally you want a little negative pinion (down) at rest, maybe 2-3 degrees.