We have bundled everything you need in a lift kit for your Silverado/Sierra 2500/3500 2WD/4WD with high quality Cognito components. There is no guesswork. Cognito components are engineered, manufactured, and assembled in the USA.The Cognito Non-Torsion Bar Drop Front Lift kit is designed and engineered to offer superior ride quality and corrected CV joint anglesThe 2.0 Performance Series IFP smooth body shocks contain the latest in shock technology to transform the performance of your truck or SUV. They use our race-proven damping control to provide a comfortable on-road ride and predictable off-road handling in even the toughest conditions.The Cognito 4-inch Block and U-Bolt Kit includes 4-inch tall powder coated semi-gloss black cast steel blocks and heavy-duty zinc plated U-bolts.