3" Performance Accessories bodylift WITH the bed support blocks installed. It's priced at $200-250. There's tons of info here on installation and info on the kit and results. My opinion: if you can tighten and loosen a nut and bolt, you can install a bodylift. Max reccommended tire size is 33x12.50R15 or something of similar size in metric form(305/75R16)
'01 XLT disguised as a '03 Fx4 Level II.