Correct pinion angle with ESPO leaf springs

[Racer57]

I had a vibration that really showed up around 65+mph after installing a used/rebuilt tremec which sits 1" higher at tail as compared to stock 4 speed.  Used every application and digital level possible to get the perfect degrees. I even installed airshocks in order to play with different degrees. Spent an almost two full summers trying to get rid of the vibration.  Late summer of 2nd year did a very bad job of speed shifting and screwed up 4thgear fork. Had to have tranny completely rebuilt.  When guy that rebuilt tranny called to tell me he was done with it, he asked if I had a vibration when driving the car. Told him yes. He said "Not surprised considering how bad the rear bushing was worn out. "  Installed tranny and its smooth as silk.