Quote:
Originally Posted by 72SB
OP, you want the engine/trans angle and pinon angle to be equal but opposite and ideally not more than 3 degrees each.
Once you get the Truck weight on all 4 tires, you may need to either add shims between trans and mount and/or angled shims on the rear end
If, for example you wind up with 3 degrees down on motor/trans but 2 1/2 up on the diff, doubt you will feel any vibes but you could just put 1/8" shim under trans to make it 2 1/2 degrees also.
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Yes, you want the ujoint angles close to parallel. But that is while driving.
Setting them that way at a static position may cause problems. The pinion will twist up even with a trailing arm or link suspension under the load of driving. That is the point I was trying to convey. Pinion may need 1-3 degrees more operating angle depending on type of suspension to eliminate any vibrations. Just trying to help out. I see many posts about drivetrain woes. The ujoints move in an ellipse. Nothing exact about their operation during suspension movement.