Thanks for more input. The angles I have learned are that as you increase the torque on the pinon, the axle rotates upward. So as you increase load the axle, the axle the springs does rise. Usually @ 3 deg under heavy load. If that axle torques above parallel, it will cause a binding. I had that to start with. As I rotated the pinon shaft down towards the ground a few degrees it lessened the acceleration vibration and binding. The drive shaft builder recommends that there be @ a 3 degree less (or more depending on your perspective) one the pinon than the crank shaft. So it starts with pinon 3 deg lower than the crank and under load comes up to parallel. It worked in my truck. But the remaining vibration is (hopefully) in drive shaft. Thanks guys, I am learning a lot!

Bud Van Deusen