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Pro Comp Rear Block and U-Bolt Kits are the simplest and affordable way to lift the rear of your vehicle. This leveling kit won't interfere with your vehicle's ride quality. It is designed to correct the pinion angle and prevent driveline vibrations. Each block and u-bolt kit is customized to a particular application. It includes ductile rear blocks, u-bolts, and nuts. Pro Comp Rear Block and U-Bolt Kit is manufactured in the USA.