Vehicle Compatibility: This fits 1999-2006 Silverado Sierra 1500, 2007 Silverado Sierra 1500 Classic, and 2002 C1500 with 0" Lift; Coil Front Spring Type; Except 4 Wheel Steering and without Electronic Ride Control Package (ZX3) Improved Handling and Performance: Cross Tuned technology featuring exclusive rebound valving system and advanced compression phase improves overall handling and performance on and off road Built to Last: Low-friction, self-lubricating seal retains gas and oil for quicker rebound and smoother compression while the application-specific piston delivers heightened control of shock motion due to the expanded piston area Strong and Durable: Features a 16mm nitro-carburized piston rod to resist scuffs & corrosion, double-welded loops at stress areas, 35mm sintered iron piston for enhanced structural integrity and polyvinyl protective boot Buy with Confidence: This set of front and rear shocks is backed by Limited Lifetime Warranty The core of this new and innovative shock from Rancho is the unique and patented rebound valving system and an advanced compression phase of the shock absorber. This proprietary process developed by the ride engineers at Rancho will elevate the overall handling and performance of your vehicle on and off-road. Each RS5000X shock is gas pressurized to 150 PSI.* The twin tube, gas pressurized shock has a variety of advantages including minimizing air-to-oil mixture that can cause foaming and shock fade. Gas pressurization also provides a mild boost of spring rate to the vehicle. The RS5000X series features a 2-1/4-inch diameter shock body. A larger shock body allows for increased fluid capacity to operate cooler and to increase vehicle control and performance at varying speeds and terrains. The RS5000X series combines a larger shock body with all-weather fluid, allowing the shock to withstand internal temperatures between -40 and 248 degrees Fahrenheit. The Rancho RS5000X series design includes patented progressive rebound and compression discs. At lower speeds or in the earlier stages of the shock's travel, an eccentric disc in the valve shim stacks will engage the valving at lower frequencies, helping to control the energy of motion as the cycle of the shock increases or decreases in its action. When hitting a pothole, off-road trail obstacle or similar activity, Rancho's Progressive Engagement Valving allows for early flow of fluid, helping to reduce harsh initial impacts and to control the flow of fluid in a progressive, gradual manner through the valving. During on- or off-road driving activities like washboarding or when travelling a rough fire road, the early flow of fluid helps to minimize a "rough" ride as the piston movement is able to glide through the initial travel motion of the shock with minimal ground impact or force. If needed, the Progressive Engagement Valving will further engage to maintain control and stability. This set of front and rear shocks is backed by Limited Lifetime Warranty. Vehicle Compatibility: This fits 1999-2006 Silverado Sierra 1500, 2007 Sierra 1500 Classic, and 2002 C1500 with 0" Lift; Coil Front Spring Type; Except 4 Wheel Steering and without Electronic Ride Control Package (ZX3).