Sharpen on- and off-road handling with the Rancho RS5000X Suspension Shock Absorber RS55151, a front (front outer) damper built around Rancho's exclusive Cross Tuned technology — a rebound valving system and advanced compression phase engineered to improve overall control and performance. It installs as a direct-fit replacement for a wide range of Chevrolet and GMC 4x4 applications, including the 1969-1974 and 1987-1991 Chevrolet Blazer, 1975-1986 Chevrolet K10/K20, 1970-1991 GMC Jimmy, and 1979-1986 GMC K1500/K2500. See the Buyer's Guide tab for the full list of 38 applications and engine details.
- Improved handling: Progressive Engagement Valving is custom-tuned per vehicle to help reduce initial low-speed impacts and minimize a rough ride.
- Strong and durable: 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.
- Temperature handling: a large 2-1/4 inch twin-tube body filled with all-weather fluid allows cooler operation and withstands internal temperatures of -40 to 248°F.
- Reduced fade: nitrogen gas pressurized to 150 PSI helps minimize air-to-oil mixing to reduce damping fade and foaming.
A polyurethane rebound bumper, rubber bushings, and fluon-banded piston help smooth ride harshness. Backed by Rancho's Limited Lifetime Warranty.
Interchange: RS5151 · N8021
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What position does this shock mount in?
The catalog lists this RS55151 as a front (front outer) shock absorber for the covered applications.
What is Cross Tuned technology?
It is Rancho's exclusive rebound valving system paired with an advanced compression phase, designed to improve overall on- and off-road handling and performance.
How is the piston rod protected?
It uses a 16mm nitro-carburized piston rod to resist scuffs and corrosion, plus a polyvinyl protective boot and double-welded loops at stress areas.
Is this shock gas charged?
Yes. It is nitrogen gas pressurized to 150 PSI, which helps minimize air-to-oil mixing to reduce damping performance fade and foaming.
Which vehicles does it fit?
It fits many Chevrolet and GMC 4x4 models such as the Blazer, K10-K30, Jimmy, and V-series Suburbans. See the Buyer's Guide tab for all 38 applications.
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