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. Our Blocks are Tapered to correct pinion/driveshaft alignment to minimize driveline vibrations. GMC C/K/R1500 2 or 4 Wheel Drives. --- DONT CRUSH EM, CUSTOMIZE EM!!! The item "1988-2016 Chevy Silverado GMC Sierra C K 1500 4 Lift Blocks Leveling Lift Kit" is in sale since Thursday, October 29, 2015.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.