rear end relocation

you move the spring pad center hole back all the u bolt holes would need to move equal or the axle tube will run over the u bolts as they are the exact width of the tubeand they arent moving . what am i not seeing?
You move it back the same amount as the spring pad so it all lines up. It still bolts down the same, once you have all the U bolts tightened down you can't tell its been moved.