Need advice with lowering blocks

[Richard]

The operating angle of the joint is what matters. Not the parts. The parts create the operating angle. If operating angle is over 3 degrees it is not the end of the world. Just less life. For a non daily driver there is no concern for more angle. Even for a daily the actual facts about ujoint life may be surprising. Check out the tech articles at Tom Woods driveshafts to see what I am saying. There are three joints in a two piece drive shaft. One should be at 1 degree or less as there is nothing to cancel it out. Typically at the transmission. The other two should be within 1-2 degrees. The pinion should have the +1-2 degrees to allow for load when driving. It is simple but can be hard to understand. Again the working angle.