I put my kit on this weekend and after I got the rear together and on the ground I measured and mine was off about 3/4" back further on the passage side. There is a little play in the block pins, so I put that side back on a jack stand and loosened the U bolts, then I wrapped a ratchet strap from the front leaf spring mount around the axle (be sure to wrap under the brake lines that run along the axle and not over them) and pulled it forward and tightened the U bolts again. Put the truck back on the ground and measured again and everything is straight now, so you might wanna try that.
