I have this issue also. Drivers side 1" lower than pass. side measuring from center of wheel to bottom of fender. I put a 4' level on the floor and then across the floor of the bed over the rear axle and come up with 1" lower on DS also. So I crawled under the truck and see that the very bottom of the springs are resting in different positions on the spring perchs. I can't tell if the spring perchs have a recess cast into them for the very end of the coil (which is not flat). There is to much in the way to get a clear enough view. Maybe someone with a lift can see what I can not.