Since the spring perches are not welded yet, loosen up the u bolts and center the axle using the fender. That should center your tires. Where does that put the perches and springs at?
I figured the axle/housing measurement by centering the wheel/tire combo in the wheel wells. Without the springs, the wheels are right on. When the springs are clamped at 41.5", the difference from side to side occurs.
