Smooth out rough pavement and dial in composed off-road handling with the Rancho RS5000X Suspension Shock Absorber (RS55378). This front shock is a direct-fit replacement for the 2011-2025 Chevrolet Silverado 2500 HD, 2011-2025 Chevrolet Silverado 3500 HD, 2011-2025 GMC Sierra 2500 HD, and 2011-2025 GMC Sierra 3500 HD — see the Buyer's Guide tab for engine details.
Cross Tuned technology: Rancho's exclusive rebound valving system and advanced compression phase are designed 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 and durable build: 16mm nitro-carburized piston rod to resist scuffs and corrosion, double-welded loops at stress areas, a 35mm sintered iron piston, and a polyvinyl protective boot.
Twin-tube body: large twin-tube design filled with all-weather fluid for cooler operation and the ability to withstand internal temperatures of -40 to 248°F.
A polyurethane rebound bumper, rubber bushings, and a fluon-banded piston help absorb ride harshness, while nitrogen gas pressurized to 150 PSI is intended to reduce damping fade and foaming. Backed by Rancho's Limited Lifetime Warranty.
Interchange: RS5378 · 23155A
This part cross-references / interchanges with the following part numbers:
RS5378, 23155A
Frequently Asked Questions
What vehicles does the Rancho RS55378 fit?
It is a direct-fit replacement for the 2011-2025 Chevrolet Silverado 2500 HD and 3500 HD, and the 2011-2025 GMC Sierra 2500 HD and 3500 HD. Check the Buyer's Guide tab to confirm your vehicle.
Is this a front or rear shock?
Per the catalog, the RS55378 is cataloged for the front position on the listed applications.
What is Cross Tuned technology?
It is Rancho's exclusive rebound valving system combined with an advanced compression phase, designed to improve overall handling and performance on and off road.
How does it handle temperature changes?
The large twin-tube body is filled with all-weather fluid for cooler operation and is built to withstand internal temperatures of -40 to 248°F.
What are the interchange numbers for this shock?
This shock replaces RS5378 and 23155A. Matching a cross-reference number helps confirm it corresponds to your original part.
Take on rough terrain with the Rancho RS7MT RS77198 Rear Suspension Shock Absorber, an application-tuned monotube shock built for precision on-road and off-road handling. It installs as a direct-fit...
WARNING:
These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov.
