1. Installation of the rear lift is a relatively easy affair. The kit comes with 4-inch blocks, longer U-bolts, and a pair of Hydro 8000 shocks. We upgraded to the Rough Country Nitro 9000 Series shocks with 10-stage variable valving, chrome-hardened 9/16-inch piston rod and 1 3/8-inch bore. We also chose the optional longer sway-bar end links too.