1950 3/4 ton i swapped the rear end and put in one from an 81 firebird. Before i get spring perches welded what should i set the pinion angle to? How do i measure it? How far up can i tilt the rearend? The body is off does that make an difference? I am worried about tiltting the rearend too much,will it still work right? As you can see this is a first for me.