Rancho RS5000X Rear Shock Absorber for 2004-2012 Chevrolet Colorado, GMC Canyon, and Isuzu i-350/i-370 RS55301

Fits select 2004-2012 Chevrolet Colorado, GMC Canyon, Isuzu i-350, and Isuzu i-370. The Rancho RS5000X RS55301 rear shock absorber is engineered to bridge the gap between street comfort and off-road capability. Featuring an advanced Progressive Engagement Valving (PEV) system, this twin-tube shock is custom-tuned to minimize initial impact harshness at low speeds while maintaining firm control during aggressive maneuvers or heavy loading.

• Precision Valving: Cross Tuned technology uses a progressive rebound valving system and an advanced compression phase to improve handling across varying terrain.
• Heavy-Duty Construction: Built with a 16mm nitro-carburized piston rod for superior corrosion resistance and a 35mm sintered iron piston for structural integrity.
• Fade Resistance: Nitrogen gas pressurized to 150 PSI reduces air-to-oil foaming, ensuring consistent damping performance under high-demand conditions.
• All-Weather Reliability: Filled with specialized fluid rated for internal temperatures ranging from -40 to 248°F.
• Ride Quality: Includes a polyurethane rebound bumper and rubber bushings to isolate road noise and vibrations, plus a fluon-banded piston for a tighter seal and smoother stroke.
• Durability Features: Double-welded loops at stress points and a polyvinyl protective boot for off-road longevity.

Each RS5000X shock absorber is backed by Rancho’s Limited Lifetime Warranty.