Fabtech 19-20 GM K1500 P/U w/Trail Boss/At4 Pkg 1.5in Budget Sys w/StealthFabtech's Upper Control Arm lift kit provides a 1. 5 in. increased ride height on Trail Boss and AT4 models without creating suspension bind at full droop. These vehicles have a factory 2 in. lift. With the addition of this 1. 5 in. lift kit, the vehicle will sit as high as a standard model with a 3. 5 in. lift kit and clear a 33 in. tall tire. This Part Fits: Year Make Model Submodel 2020 2021 Chevrolet Silverado 1500 Custom 2019 2021 Chevrolet