Smooth out the ride and keep body motion in check with the Rancho RS5000X Suspension Shock Absorber (RS55126), a REAR shock that drops in as a direct-fit replacement for the 1999-2004 Ford F-450 Super Duty, 1999-2004 Ford F-550 Super Duty, and 1983-2011 Ford Ranger. At its heart is Rancho's exclusive Cross Tuned technology, pairing a rebound valving system with an advanced compression phase for improved on- and off-road handling and performance.
- Progressive Engagement Valving: custom-tuned per vehicle to help reduce initial impacts at low speeds and minimize a rough ride.
- Strong and durable: 16 mm nitro-carburized piston rod resists scuffs and corrosion, double-welded loops at stress areas, a 35 mm sintered iron piston, and a polyvinyl protective boot.
- Twin-tube design: a large 2-1/4 in twin-tube body filled with all-weather fluid allows cooler operation and withstands internal temperatures of -40 to 248°F.
- Nitrogen charged: pressurized to 150 PSI to minimize air-to-oil mixing and help reduce damping fade and foaming.
A Compression Control Valve regulates fluid transfer to help maintain motion control, while a polyurethane rebound bumper, rubber bushings, and a fluon-banded piston work toward a smoother ride. Backed by Rancho's Limited Lifetime Warranty.
Interchange: 813032 · 37014 · RS5126
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does the RS55126 fit?
It is a direct-fit replacement for the 1999-2004 Ford F-450 Super Duty, 1999-2004 Ford F-550 Super Duty, and 1983-2011 Ford Ranger. See the Buyer's Guide tab to confirm your exact application.
Is this a front or rear shock?
This RS5000X shock is cataloged for the REAR position on the listed applications.
What is Cross Tuned technology?
It is Rancho's exclusive system pairing a rebound valving setup with an advanced compression phase, designed to improve overall handling and performance both on and off road.
How does it handle temperature extremes?
The large 2-1/4 in twin-tube body is filled with all-weather fluid for cooler operation and can withstand internal temperatures of -40 to 248°F.
How many should I order?
Shocks are sold individually. Replacing both sides of the axle together as a matched pair is recommended for balanced, even ride control.
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