Rancho RS55045 RS5000X Rear Shock for Ford Super Duty 4.0"-6.0" Lift 99-16

Vehicle Fitment

• 1999-2016 Ford F-250 Super Duty 4WD (Rear, 4.0"-6.0" Lift)
• 2005-2010 Ford F-350 Super Duty 4WD (Rear, 4.0"-6.0" Lift)

Features

• Rancho RS5000X™ series gas-charged rear shock absorber
• Progressive Engagement valving for smoother ride control
• Tuned compression control valve enhances damping responsiveness
• Large 2.25" twin-tube body for increased fluid capacity
• 16 mm nitro-carburized piston rod for corrosion resistance
• Full-displaced 35 mm bore piston for improved performance
• Protective red accordion boot shields rod and seal
• Designed for lifted 4WD Super Duty applications

Specifications

• Part Number: RS55045
• Brand: Rancho
• Series: RS5000X™
• Position: Rear Shock Absorber
• Design: Gas-charged, twin-tube
• Compressed Length: ~19.76"
• Extended Length: ~33.79"
• Shock Travel: ~14.03"
• Mount Type: Upper & lower eyelet mounts
• Boot Included: Yes (red protective boot)
• Lift Range: Suitable for ~4.0"-6.0" rear lift setups

Included Components

• 1x Rancho RS5000X™ Rear Shock Absorber (RS55045)

Product Description

The **Rancho RS55045 RS5000X™ Rear Shock Absorber** is engineered for lifted Ford Super Duty trucks, specifically rear 4WD applications with approximately **4.0"-6.0" lift**. Built with Rancho's proprietary Progressive Engagement valving and tuned compression control, this gas-charged shock delivers improved damping performance over rough terrain, helping control rear suspension movement and improve ride comfort. Its 2.25" twin-tube design increases fluid capacity to better handle heat and sustained use.

Constructed with a nitro-carburized piston rod for corrosion resistance and a full-displaced bore piston for structural strength, the RS55045 also includes a protective red accordion boot to shield key components from debris. Direct-fit mounting and eyelet hardware make installation straightforward on compatible lifted Ford F-250 and F-350 Super Duty 4WDs from 1999-2016. Backed by Rancho's limited lifetime warranty, this shock absorber enhances ride quality and handling confidence on lifted trucks.