2wd, 1/2 ton, with 4 wheel disc, with hvy duty brakes. 4wd, 1/2 ton, with 4 wheel disc, with hvy duty brakes. Yukon XL, Suburban. Express, savana. All models. Hummer H2. 6.0l. 9,900 gvwr. , 4wd, 3/4 ton. , 2wd, 3/4 ton. 8500 & 8600 gvwr. Hydro boost system. Without silverado, sierra. 4wd, 1/2 ton, with crew cab. 2wd, 1/2 ton, with crew cab. 4wd, 3/4 ton, without heavy duty. 2wd, 3/4 ton, without heavy duty. 4wd, 2500 series, without heavy duty. Without awd, 3/4 ton, 8500 & 8600 gvw. 2wd, with coil springs, 2500 series, without heavy duty.