Bilstein B8 5160 Series Stock Mount Remote Reservoir Shock – 25-311891 (Rear)

Upgrade the rear suspension on your lifted GM heavy-duty truck with the Bilstein B8 5160 Series Stock Mount Remote Reservoir Shock (part #25-311891). This direct-fit monotube shock is specifically designed for trucks with 0–2" of rear lift and delivers superior heat dissipation, increased wheel travel, and consistent fade-free performance for both daily driving and serious off-road use.

Key Benefits

The remote reservoir significantly increases oil capacity for better cooling and damping sensitivity under heavy loads or sustained off-road conditions. Bilstein’s application-specific velocity-sensitive digressive valving provides precise control, while the 360° swivel banjo hose fitting allows a clean, low-profile installation. A durable zinc-plated finish and included billet reservoir clamp round out a ready-to-install package built for the demands of HD trucks.

Features

• Monotube gas-pressure design for consistent, fade-free performance
• Remote reservoir for increased cooling capacity and greater wheel travel
• Velocity-sensitive digressive valving tuned for this application
• 360-degree swivel banjo hose fitting
• Billet reservoir clamp included
• Zinc-plated finish for corrosion resistance
• Smooth body (non-coilover) design
• Direct stock-mount eyelet fitment
• Sold individually (quantity 2 required per vehicle)

Specifications

• Part Number: 25-311891
• Series: B8 5160
• Position: Rear
• Collapsed Length: 16.54" (420 mm)
• Extended Length: 27.04" (686.7 mm)
• Travel: 10.50"
• Piston Diameter: 46 mm
• Body Diameter: 2.0" OD
• Shaft Diameter: 14 mm
• Upper / Lower Mount: Eye 14.4 mm
• Adjustable Damping: No
• Finish: Zinc Plated
• Warranty: Limited 2-Year

Fitment

Primary Application (most common):
2001–2026 Chevrolet Silverado 2500HD / 3500HD (2WD & 4WD) – Rear, 0–2" lift
2001–2026 GMC Sierra 2500HD / 3500HD (2WD & 4WD) – Rear, 0–2" lift

Also Fits (with 0–2" rear lift where applicable):

• Chevrolet Avalanche 1500 / 2500 (2002–2006)
• Chevrolet Silverado 1500 HD (2001–2003, 2005–2006)
• Chevrolet Silverado 2500 (1999–2004)
• Chevrolet Silverado 2500 HD Classic (2007)
• Chevrolet Silverado 3500 (2001–2006)
• GMC Sierra equivalents of the above models
• Select Suburban, Yukon, Tahoe, and Hummer H2 applications

Important Fitment Notes:
Designed for vehicles with 0–2" of rear lift. Due to variations in aftermarket lift kits, always measure your current shock’s collapsed and extended lengths to confirm proper fitment before ordering. Replaces earlier Bilstein part numbers including 25-196481.