Take on rough pavement and the trail with the Rancho RS5000X Suspension Shock Absorber RS55188, a front-position damper built around Rancho's exclusive Cross Tuned technology. It's a direct-fit replacement for the front of the 1986-1994 Nissan D21, 1998-2004 Nissan Frontier, and 2000-2004 Nissan Xterra — see the Buyer's Guide tab for engine-level fitment.
- Cross Tuned technology: an exclusive rebound valving system and advanced compression phase designed to improve overall on- and off-road handling and performance.
- Progressive Engagement Valving: custom-tuned for the application to help reduce initial impacts at low speeds and minimize a rough ride.
- Strong and durable: 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.
- All-weather twin-tube body: filled with all-weather fluid for cooler operation, rated to withstand internal temperatures of -40 to 248°F, and nitrogen gas pressurized to 150 PSI to help reduce damping fade and foaming.
A polyurethane rebound bumper, rubber bushings, and fluon-banded piston help absorb ride harshness, while a low-friction, self-lubricating seal retains gas and oil for quicker rebound and smoother compression. Backed by Rancho's Limited Lifetime Warranty.
Interchange: RS5188 · 23197D
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does the RS55188 fit?
It's a front-position shock for the 1986-1994 Nissan D21, 1998-2004 Nissan Frontier, and 2000-2004 Nissan Xterra. Check the Buyer's Guide tab to confirm your engine and configuration.
Is this a front or rear shock?
The catalog lists the RS55188 as a FRONT-position Suspension Shock Absorber for the applications shown.
What is Rancho's Cross Tuned technology?
It's Rancho's exclusive rebound valving system paired with an advanced compression phase, designed to improve overall on- and off-road handling and performance.
What does the nitrogen gas pressurization do?
The shock is nitrogen gas pressurized to 150 PSI to minimize air-to-oil mixing, which helps reduce damping performance fade and foaming.
Should I replace shocks in pairs?
This listing is for one shock. Replacing shocks as a matched axle pair is recommended for balanced, even ride control; sold individually.
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