We have bundled everything you need in a lift kit for your GMC/Chevy Sierra/Silverado 1500 2WD/4WD with high quality components. There is no guesswork. components are engineered, manufactured, and assembled in the USA. The Front Lift kit is designed and engineered to offer superior ride quality, corrected CV joint angles, and steering geometry. The front struct spacers and standard white body rear shocks offer an efficient and cost-effective way to lift your truck while maintaining factory ride quality. The 2.5-inch Block and U-Bolt Kit includes 2.5-inch tall powder coated semi-gloss black cast steel blocks and heavy-duty zinc plated U-bolts. Note: This kit is not compatible with, Chevy Trail Boss and GMC AT4/ Denali Models. Each Kit Features: 4-inch Front Lift Components 2.5-inch Rear Lift Block and U-Bolts Standard white body rear shocks Maintains Adequate Droop Travel for Superior Ride Quality Level vehicle stance front to rear Allows for up to a 34x12 Tire on a 9-Inch Wide Wheel with 4.5-Inch Backspacing 10-hour DIY install time Made in the USA Warning!-This product is not compatible with vehicles equipped with ARC Adaptive Ride Control (includes all 1500 Denali models). DOWNLOAD INSTALLATION GUIDE Cognito 110-P0949 Cognito 110-P0949