Smooth out impacts and keep body motion under control with the Rancho RS5000X Suspension Shock Absorber (RS55273), a direct-fit rear shock for the 1999-2004 Ford F-250 Super Duty, 1999-2004 Ford F-350 Super Duty and 2008-2016 Ford F-450 Super Duty. See the Buyer's Guide tab for the full engine-level applications.
- Cross Tuned technology: an exclusive rebound valving system and advanced compression phase work to improve overall handling and performance on and off road.
- Progressive Engagement Valving: custom-tuned for each vehicle to help reduce initial impacts at low speeds and minimize a rough ride.
- Strong build: a 16mm nitro-carburized piston rod resists scuffs and corrosion, with double-welded loops at stress areas, a 35mm sintered iron piston and a polyvinyl protective boot.
- All-weather operation: a large twin-tube body filled with all-weather fluid handles internal temperatures from -40 to 248°F for cooler operation.
Nitrogen gas pressurized to 150 PSI minimizes air-to-oil mixing to reduce damping fade and foaming, while a polyurethane rebound bumper, rubber bushings and a fluon-banded piston help absorb harshness. A low-friction, self-lubricating seal retains gas and oil for quicker rebound and smoother compression. Backed by Rancho's Limited Lifetime Warranty.
Interchange: 813053 · 813096 · 342509 · 342510 · 342511 · 58406 · 58808 · 77810 · G63461 · G63810 · 344413 · 565091 · KG54332 · KG54333 · 210438 · 210440 · 34685 · 34687 · 911194 · 911196 · SH61654 · 76685 · RS5273 · 12140211 · N8060
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Which vehicles does the Rancho RS55273 fit?
It is a rear shock for the 1999-2004 Ford F-250 Super Duty, 1999-2004 Ford F-350 Super Duty and 2008-2016 Ford F-450 Super Duty. Check the Buyer's Guide tab to confirm your engine and configuration.
What is Cross Tuned technology?
It combines an exclusive rebound valving system with an advanced compression phase, tuned to improve overall handling and performance on and off road.
How does this shock handle temperature swings?
Its large twin-tube body is filled with all-weather fluid for cooler operation and is built to withstand internal temperatures from -40 to 248°F.
Why is it nitrogen gas pressurized?
The unit is charged with nitrogen gas to 150 PSI, which minimizes air-to-oil mixing to help reduce damping performance fade and foaming.
Should I replace shocks in pairs?
Shocks are sold individually, but replacing the pair on an axle together is recommended for balanced, even ride control. Order the quantity your vehicle requires.
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