Nine Levels of Performance: Nine-position easy-to-adjust knob allows customized damping control and firmness for on-road and off-road flexibility Strong & Durable: Application-specific 16mm or 18mm hard chromed piston rod to resist scuffs and corrosion, integrated bottom mounts or double-welded loops at stress areas and 1.25-in. sintered iron piston for enhanced structural integrity Built to Last: Low-friction, self-lubricating seal retains gas and oil for quicker rebound and smoother compression while the long-lasting premium liquid metallic finish and polyvinyl protective boot ensures longer life Handles Extreme Temperature Changes: Up to 2.38-in. tri-tube body (application specific) filled with all-weather fluid allows for cooler operation, increased vehicle control and ability to withstand internal temperatures of -40 to 248°F Vehicle Compatibility: This fits your 1981-1986 K10 K20 Suburban, 1975-1986 K5 Blazer, 1987-1988 V10 Suburban and 1989-1991 V1500 V2500 Suburban with 0-2" Lift Recognized as the first nine-position manually adjustable ride control series in the off-road market, Rancho RS9000XL shocks deliver unprecedented control and performance. Ideal for on- and off-road use, towing and more, the adjustable damping enhances ride characteristics by counteracting the additional unsprung mass inherent in larger tire and wheel combinations. A large shock body (up to 2.75-in.) allows the RS9000XL to run cooler and more consistent even under the most demanding conditions. Polyurethane bushings enhance performance and durability while a boot protects the shock rod and oil seal. Rancho RS9000XL shocks and struts are ideal for on and off road use and towing. RS9000XL series shocks features 9 levels of performance that allows the driver to manually change the setting to produce a soft or firm ride. The 9 levels provide up to a 400% change in control from level 1 to level 9. To change your ride quality simple turn the adjustment knob. Rancho RS9000XL shocks and struts feature a 2.75" tri-tube body that increases fluid capacity and allows for cooler operation. This shock is nitrogen gas charged and utilizes a graphite filled Fluon banded piston for increased durability. RS9000XL series shocks and struts use a heavy duty 18mm nitro-carburized rod and rebound bumpers, these bumpers reduce harsh terrain felt in the vehicle. Rancho RS9000XL shocks and struts are built to last and are finished in a long lasting liquid metallic finish. Get your Rancho shocks and be prepared for any situation.