Re: driveline angle
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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