Front 1" to 3" Lift Adjustable Forged Steel Torsion Keys. Made from Heat Treated Forged Steel which resists corrosion.Pressure Forged & Extrude Honed from T6061 Billet Aluminum Stronger & Lighter than cast aluminum blocks, fabricated steel blocks or cheap cast or ductile iron steel blocks Blocks & 13 Square U-bolts with Hardware. Blocks are Tapered to correct pinion/driveshaft alignment to minimize driveline vibrations. GMC Sierra 1500 Classic Non HD. --- DONT CRUSH EM, CUSTOMIZE EM!!! The item "1988-2007 Silverado Sierra K 1500 4WD 3-3 Lift Kit Torsion Keys Leveling Kit" is in sale since Sunday, April 10, 2016. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Suspension & Steering\Lift Kits & Parts". The seller is "radz4rydz" and is located in W of LasVegas, NV. This item can be shipped to United States, Canada.