Ok...so i took all your advice and decided to assemble my 14 bolt without welding my spring perches. I now am to that point and i'm ready to tack the perches. The rear axle is on center within 1/16". But im not sure as to how much to rotate the rear axle for pinion angle. I'm running 6" arched skyjackers with 2" blocks. What the procedure for this angle. I know that i want some angle on the u-joints because the are not designed to run perfectly straight with the mating piece. Although there is a jack in the picture the truck is sitting compressed on all 4 wheels.