Rancho RS5000X Series Rear Shock for 1999-2016 Ford F-250/F-350 Super Duty (RS55045)

Fits select 1999-2016 Ford F-250 and F-350 Super Duty trucks. This Rancho RS5000X series rear shock (MPN: RS55045) is engineered to bridge the gap between street comfort and off-road control, featuring a nitrogen-charged twin-tube design for reduced damping fade and improved responsiveness.

Constructed with a 16mm nitro-carburized piston rod to resist scuffs and corrosion, this shock uses a 35mm sintered iron piston for structural integrity and double-welded loops at critical stress areas. The Cross Tuned technology uses an exclusive valving system to manage fluid transfer efficiently, while the Progressive Engagement Valving helps absorb low-speed impacts and harsh road vibrations. To ensure long-term performance, a low-friction self-lubricating seal retains gas and oil while a fluon-banded piston enhances consistency across changing conditions.

• Fitment: 1999-2016 Ford F-250/F-350 Super Duty models
• Construction: Twin-tube body with 16mm nitro-carburized piston rod and 35mm sintered iron piston
• Pressure: Nitrogen gas pressurized to 150 PSI to minimize foaming and fade
• Temperature Range: Rated for -40°F to 248°F via all-weather fluid
• Bushings & Boots: Includes polyurethane rebound bumper, rubber bushings, and polyvinyl protective boot
• Manufacturer Part Number: RS55045
• Warranty: Rancho Limited Lifetime Warranty