12 The factory shackles were mounted onto the new leaf packs. The basic kit comes with add-a-leaves and blocks, but the truck owner opted for the complete replacement lift packs. These offer improved ride and better flex over using the old packs. The kit came with new U-bolts. The factory axle blocks with the bump landing pads are reused. Rough Country N2.0 shocks were installed in the rear, as well. Shop time from start to finish was four hours.