So this weekend I finally got started on my winter buildup of the General. The D60 and 14b are in along with 56" rear springs. I went with a DIY shackle flip and switched it. I also installed the springs backwards to move the axle back. Am I right in assuming that longer shackles would fix this problem? Seems like using geometry, I should have made the shackles about 6" long. Right now I can make the spring hit the bottom of the shackle flip bracket. The shackles are currently 4.5" long. Plus I was wanting more lift anyways. Right now the truck sits level with a zero rate on the 56s. The front is 2.5" Superlift springs, which I plan to take out in favor of 52s. With the stock cover, I'm not going to have any issue with the axle back that far - aside from fender clearance. I think it will be fine regardless because the springs sit flat right now and I plan to bumpstop them from moving up any further. So the axle won't move up any further. Plus longer shackles will make clearance even better. I pulled the 56s from an 87 burb. I removed 2 leaves, the 2 that didn't have the little friction pads on the ends: Oh, and I love my porta-band. One cut and I gain almost 1" of clearance.