Rough Country N3 Rear Shock Absorbers 2.5–6" for 1999–2006 Chevy/GMC 1500 — Nitrogen‑Charged, 54mm Fast‑Cooling

Rough Country 2.5–6" N3 Rear Shock Absorbers (23158_A) are heavy‑duty, nitrogen‑charged rear shocks engineered to restore ride control and stability for 1999–2006 Chevy and GMC 1500 trucks with 2.5–6" lifts.

These rear shocks are designed to match Rough Country’s N3 front and rear system performance, providing progressive damping through 10-stage variable valving and fast‑cooling 54mm bodies. Built for lifted half‑ton trucks, they combine military‑grade fluid and robust construction to handle higher travel and loads while maintaining consistent response in a wide range of temperatures.

How do these shocks improve ride quality on a lifted 1500?

The N3 valving delivers progressive damping, smoothing out harsh impacts without making the truck feel floaty on pavement. The 54mm fast‑cooling body helps dissipate heat during extended use, preserving shock performance under stress.

• 10‑stage variable valving for controlled rebound and compression.
• Nitrogen charge reduces cavitation for consistent performance.
• Fast cooling 54mm shock body for extended duty and heat management.

What construction features make these shocks durable?

Rough Country builds these absorbers with high‑tensile materials and rubber bushings to resist wear and reduce noise. The spring‑loaded piston rod seal and military‑rated hydraulic fluid keep internal components protected and operational in demanding conditions.

• 36kN tensile strength components for structural durability.
• Rubber bushings to isolate vibration and minimize squeak.
• Spring‑loaded piston rod seal and military spec fluid rated to very low temperatures for reliable sealing.

Will these shocks work across temperature extremes and off‑road use?

Yes; the combination of nitrogen charging and military‑grade fluid allows the shocks to resist foaming and maintain damping across cold and hot conditions. They're built to withstand off‑road demands such as repeated impacts, washboard trails, and heavier payloads typical of lifted trucks.

• Military fluid rated to extremely low temperatures (spec sheet: -40 to -50°C performance range).
• Nitrogen pressurization to prevent aeration under heavy use.
• Design suited for both street driving and moderate off‑road excursions.

What comes with the shocks and what warranty applies?

Each shock arrives ready to install with rubber bushings and hardware compatible with OE mounting points on 1999–2006 Chevy/GMC 1500 rear suspension setups. Rough Country backs these absorbers with a limited lifetime replacement warranty, providing added peace of mind for long‑term ownership.

• Includes nitrogen‑charged shocks with rubber bushings installed.
• Direct‑fit for 1999–2006 Chevy/GMC 1500 trucks with 2.5–6" lift setups.
• Limited lifetime replacement warranty from Rough Country.

Who is this for: These Rough Country 2.5–6" N3 rear shocks are for owners of 1999–2006 Chevy or GMC 1500 trucks who have lifted their vehicle 2.5–6 inches and need durable, consistent rear damping. They suit truck drivers who split time between highway and off‑pavement routes, carry occasional loads or campers, and want a shock engineered to resist heat and cavitation while improving control and stability. If you require monotube performance, military‑grade fluid protection, and a backed warranty for lifted half‑ton trucks, these shocks are a practical upgrade option.