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Part Numbers RS55198 and RS999901 Front pair of Strut Spring assemblies with matched pair of two rear shocks. Shocks are extended length for 2front lift systems and up to 1.5rear lift systems. These parts fit models with front struts ONLY and will not fit “ClassicSilverado/Sierra 1500 models. Excludes HD Models. Designed for 4WD vehicles Front height not adjustable from specified height. Rancho 90-day Free Ride Guarantee Award-winning Rancho QUICKLIFT Loaded assemblies level and lift late-model trucks and SUVs providing an aggressive stance and allowing for the use of larger wheel and tire packages without the cost of a complete suspension system or the long installation time. Each Rancho quickLIFT Loaded unit is a gas charged complete modular assembly that includes an application-specific installed coil spring and upper mounting plate to simplify installation. Engineered with the globally renowned and exclusive RS9000XL nine position adjustability Rancho quickLIFT Loaded units improve performance and provide the ability to manually tune the vehicle’s ride to suit terrain and driver preference. RS5000X Gas Shock 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. 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. The RS5000X series combines a larger shock body with all-weather fluid allowing the shock to withstand internal temperatures between -40 and 248 degrees. 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.