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 C/K 2500 3500 2 or 4 Wheel Drives.--- DONT CRUSH EM, CUSTOMIZE EM!!! The item "1988-2010 Chevy Silverado GMC Sierra C K 2500 3500 3 Lift Blocks Lift Kit" is in sale since Sunday, March 19, 2017. 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 Las Vegas Nv. This item can be shipped to United States, Canada.