[Richard]

The working angle of the ujoint is what matters, not the driveline angle. Driveline angle + trans angle and driveline angle + pinion angle determine working angle at ujoints. Working angle should not be zero, If over 3 degrees it is not really a problem as well. I see problem of people believing both angles should be set the same, not allowing for load at axle. Angles should be equal under load. That is the main reason some experience vibration issues. Angles constantly change while driving. With a modified vehicle the key is finding the sweet spot for average driving conditions.