Improves Handling & Performance: RS5000X shocks improve overall handling and performance on and off road; RS5000 steering stabilizer reduces wheel shimmy, bump steer and vibration which helps minimize on or off-road driver fatigue Handles Extreme Temperature Changes: The shocks & stabilizers twin-tube cellular gas design filled with all-weather fluid allows for cooler operation, increased vehicle control & ability to withstand internal temperatures of -40 to 248 degrees fahrenheit Built to Last: RS5000X shocks low-friction, self-lubricating seal retains gas and oil for quicker rebound and smoother compression; RS5000 stabilizer features a protective boot to safeguard shock rod and oil seal Buy with Confidence: Knowing that Rancho RS5000X series shocks and RS5000 steering stabilizer are backed by Rancho’s limited lifetime warranty, you can purchase this set with confidence Vehicle Compatibility: These Rancho RS5000X shocks and stabilizer are designed to fit 1999-2004 F350 Super Duty 4WD with 0” lift & OEM steering damper mounts; Fits Crew Cab, Extended Cab & Standard Cab Pickups Enhance your driving dynamics with Rancho RS5000X series front and rear shocks! Equipped with a 16-millimeter nitro-carburized piston rod to resist scuffs and corrosion, double-welded loops at stress areas, and a 35-millimeter sintered iron piston for enhanced structural integrity, it also boasts a polyvinyl protective boot. The large twin-tube body, filled with all-weather fluid, allows for cooler operation, increased vehicle control, and the ability to withstand internal temperatures from -40 to 248 degrees Fahrenheit. A 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 minimizes air-to-oil mixture, reducing damping performance fade and foaming. The Compression Control Valve is custom-tuned for each vehicle to regulate fluid transfer, absorbing impacts without disc flutter and maintaining shock motion control. - The Rancho RS5000 steering stabilizer enhances a vehicle’s performance. Designed for vehicles with oversized tires and wheels, the RS5000 steering stabilizer minimizes on and off-road driver fatigue by reducing wheel shimmy, bump steer and vibration. Rancho's RS5000 series steering stabilizer features a protective boot to safegaurd shock rod and oil seal. - Backed by Rancho's limited lifetime warranty, you can purchase this set with confidence. - Vehicle Compatibility: Fits 1999-2004 F350 Super Duty 4WD with 0” lift & OEM steering damper mounts; Fits Crew Cab, Extended Cab & Standard Cab Pickups.