Fabtech 19-20 GM C/K1500 P/U w/Trail Boss/At4 Pkg 4in Perf Sys w/Dl 2.5 Resi & 2.25The Chevy Trail Boss and GMC AT4 both have a factory 2 in. lift compared to other GM 1500 trucks of the same year model. Fabtech's suspension system for these two trucks provide a 4 in. lift height on top of the factory 2 in. lift for clearance of 35 in. tall tires. Once a Trail Boss or AT4 is lifted with a Fabtech 4 in. system, the truck will sit at the same height as a 1500 with a 6 in. suspension and 35 in. tires. The near stock track width keeps