Why does something so simple have to become so complicated?The comprehension of the process has been explained over and over yet many want to complicate the process to make it seem like rocket science engineering.Weather the joints are inline or on parallel planes the final pinion angle,1,2 or 4+ degrees constitue the working angle and the needles will move freely when the load or movement occurrs in the joint.It's not like they are constantly rotating and as long as the have lube will last.U-joints are made to compensate for varainces in alignment,up and down,left and right.The best case senerio is the least amont of angle in any direction.Some where there is an engineer or chassis builder and HFAO