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 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 Smooth Performance: Polyurethane rebound bumper and rubber bushings help absorb ride harshness while the fluon-banded piston enhances responsiveness to changing road conditions for an overall smoother ride 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 Vehicle Compatibility: Compatible with 1988-1999 K1500/K2500 Model Vehicles with 2.5" Lift and OE Style Upper Ball Joints This set comes with two front and two rear Rancho RS5000X Shocks. Cross Tuned technology featuring an exclusive rebound valving system and advanced compression phase improves overall handling and performance on and off road. Exclusive Progressive Engagement Valving is custom-tuned for each vehicle to help reduce initial impacts at low speeds and minimizes a rough ride. The RS5000X Series shock 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. Large twin-tube body filled with all-weather fluid allows for cooler operation, increased vehicle control and ability to withstand internal temperatures of -40 to 248°F. Polyurethane rebound bumper and rubber bushings help absorb ride harshness while the fluon-banded piston enhances responsiveness to changing road conditions for an overall smoother ride. Nitrogen gas pressurized to 150 PSI to minimize air-to-oil mixture to reduce damping performance fade and foaming. The compression control valve is custom-tuned for each vehicle to regulate fluid transfer to absorb impacts without disc flutter and help maintain shock motion control. 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. Buy with confidence, the RS5000X comes with Rancho's limited lifetime warranty. This pair of RS5000X Series shocks are compatible with 1992-1994 Blazer 4WD, 1988-1999 K1500, 1992-1999 K1500 Suburban, 1988-2000 K2500, 1995-1999 Tahoe 4WD, 2000 Tahoe / Yukon 4WD (Old Body Style), and 1992-1999 Yukon 4WD. Do not Use with Aftermarket (Stamped Steel Housing) Ball Joints. Use Only with OE Style (Forged Housing Construction) Upper Ball Joints with 2.5" Lift. Not for use with aftermarket shock spacers or relocation brackets.