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 Durable and Long-Lasting: Built to withstand the toughest of terrains and weather conditions, these Rancho products are made from high-quality materials that are built to last Improved Handling and Stability: Whether you're navigating rough terrain or taking on winding roads, the Rancho RS5000X shocks provide improved handling and stability, giving you better control of your vehicle Maintains Vehicle Control: 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 Vehicle Compatibility: This fits your 2011 F150 4WD Lariat Limited with 2.5 inch lift and 2010-2013 F150 4WD Platinum with 2.5 inch lift; Use with Rancho RS6519B, RS66519B System(s) An all-in-one solution, Rancho quickLIFT loaded assemblies level and lift late model trucks and SUVs. This complete assembly simplifies installation, levels the front suspension and provides additional lift to accommodate larger wheels and tires. Levels and lifts late model trucks and SUVs without the cost of complete suspension system. Complete assembly includes application-specific coil spring and upper mounting plate to simplify installation. Removes factory rake for an aggressive stance. Provides 2-in. of additional lift to accommodate up to 285x70x17 tires for a custom look and increased ground clearance. Includes RS9000XL strut with nine-position easy-to-adjust knob to allow customized damping control and firmness for on-road and off-road flexibility. Low-friction, self-lubricating seal retains gas and oil for quicker rebound and smoother compression and long-lasting premium liquid metallic finish and polyvinyl protective boot ensure long life. Nitrogen gas pressurized to 100 PSI to minimize air-to-oil mixture and reduce damping performance fade and foaming. From its humble beginnings in 1955 to the present, Rancho has been dedicated to delivering suspension systems, shock absorbers and accessories that deliver rugged on- and off-road performance for Jeeps, trucks and SUVs.