They sell a SuperLift 4" kit for our trucks but they cost around $2k for the basic kit, not including install. Most of us do a 3" Performance Accessories body lift, Torsion Twist (no more then 2" if 4wd, 3" if 2wd), Warrior Products lift shackles, and you can fit up to a 35" tire. If you look in the projects section there are a couple How-To build threads showing how to do these things step by step. Check out my library for pictures of my ST in it's different stages of lift starting with the TT, SL then added the BL.