Bilstein 25-311877 B8 5160 Front Shock 4-6in Lift for 99-04 Ford F-250/F-350 4WD

Vehicle Fitment

• 1999-2004 Ford F-250 Super Duty (XL, XLT, Lariat - 4WD/4x4, 5.4L V8 Triton)
• 1999-2004 Ford F-250 Super Duty (XL, XLT, Lariat - 4WD/4x4, 6.8L V10 Triton)
• 1999-2003 Ford F-250 Super Duty (XL, XLT, Lariat - 4WD/4x4, 7.3L Power Stroke Diesel V8)
• 2003-2004 Ford F-250 Super Duty (XL, XLT, Lariat - 4WD/4x4, 6.0L Power Stroke Diesel V8)
• 2003-2004 Ford F-250 Super Duty (King Ranch - 4WD/4x4, 6.8L V10 Triton / 6.0L Power Stroke Diesel V8)
• 2004 Ford F-250 Super Duty (Harley-Davidson Edition - 4WD/4x4, 6.8L V10 Triton / 6.0L Power Stroke Diesel V8)
• 1999-2004 Ford F-350 Super Duty (XL, XLT, Lariat - 4WD/4x4, 5.4L V8 Triton)
• 1999-2004 Ford F-350 Super Duty (XL, XLT, Lariat - 4WD/4x4, 6.8L V10 Triton)
• 1999-2003 Ford F-350 Super Duty (XL, XLT, Lariat - 4WD/4x4, 7.3L Power Stroke Diesel V8)
• 2003-2004 Ford F-350 Super Duty (XL, XLT, Lariat - 4WD/4x4, 6.0L Power Stroke Diesel V8)
• 2003-2004 Ford F-350 Super Duty (King Ranch - 4WD/4x4, 6.8L V10 Triton / 6.0L Power Stroke Diesel V8)
• 2004 Ford F-350 Super Duty (Harley-Davidson Edition - 4WD/4x4, 6.8L V10 Triton / 6.0L Power Stroke Diesel V8)

Fitment Notes

• Fits 4WD (4x4) drivetrain only - does NOT fit 2WD (RWD) models.
• Designed for vehicles with 4-6 inches of front lift - not suitable for stock-height or 0-2.5 inch lift applications.
• Front position only - sold as a single unit (one shock per purchase); two required for a complete front installation.
• The 7.3L Power Stroke diesel was phased out mid-2003 model year and replaced by the 6.0L Power Stroke; both engines are supported within their respective production years.
• Front compression bump stop on the chassis may require modification to prevent contact with the shock body - verify clearance during installation.
• FX4 Off-Road Package equipped trucks are supported; verify lift height compatibility with FX4-specific suspension geometry before installation.

Features

• Remote reservoir design significantly increases oil volume and cooling capacity for consistent, fade-free damping during sustained off-road driving and high-load towing conditions.
• 46mm monotube construction provides superior heat dissipation and damping consistency compared to conventional twin-tube shock absorbers.
• Velocity-sensitive digressive valve settings are tuned specifically for the 1999-2004 Ford F-250/F-350 Super Duty 4WD platform with 4-6 inch lift configurations.
• 360-degree swivel banjo hose fitting allows clean, low-profile reservoir routing without hose binding or clearance conflicts.
• Increases available wheel travel beyond what standard or non-reservoir shocks can deliver, improving terrain compliance and traction on lifted trucks.
• Application-specific damping tune balances on-road composure with aggressive off-road capability for heavy-duty use.
• Billet reservoir mount bracket included for secure, rattle-free installation.
• High-pressure nitrogen gas charge prevents oil aeration (cavitation) and maintains consistent damping force under extreme loads and temperatures.
• Direct-fit design uses OE-style upper Eye 16mm and lower Eye 12mm mounting hardware for straightforward bolt-on installation.
• Built to handle the added stress of 4-6 inch suspension lifts, correcting shock geometry and travel on heavily modified Super Duty platforms.

Specifications

• Part Number: 25-311877
• Series: B8 5160 Remote Reservoir
• Position: Front (sold individually - one shock per unit)
• Piston Diameter: 46mm digressive monotube
• Lift Range Compatibility: 4-6 inches
• Collapsed Length: 15.96 inches
• Extended Length: 27.02 inches
• Upper Mount Type: Eye 16mm
• Lower Mount Type: Eye 12mm
• Reservoir Type: Remote (360° swivel banjo hose fitting)
• Gas Charge: High-pressure nitrogen monotube
• Warranty: 90-day limited against manufacturer defects (B8 5160 series)

Included Components

• 1x Bilstein B8 5160 Front Remote Reservoir Shock (25-311877)
• 1x Billet reservoir mount bracket

Product Description

The Bilstein 25-311877 B8 5160 front remote reservoir shock is engineered as a direct-fit performance solution for 1999-2004 Ford F-250 and F-350 Super Duty trucks running 4-6 inches of front suspension lift on a 4WD platform. Designed for the demands of serious off-road use and heavy-duty truck builds, the B8 5160 brings race-proven remote reservoir technology to a bolt-on package. The external reservoir dramatically increases the shock's oil volume, delivering the kind of sustained heat management that conventional shocks simply cannot provide under repeated hard use - whether that means desert trail running, rock crawling, or heavy payload hauling on rough roads.

At the core of the 25-311877 is Bilstein's 46mm monotube design, which keeps oil and gas permanently separated to prevent aeration (cavitation) and maintain consistent damping force across the full range of suspension travel. Velocity-sensitive digressive valve settings are tuned specifically for the lifted Super Duty platform, responding to slow and fast suspension inputs with the appropriate amount of damping force - firm and controlled at high speed, compliant and absorbent over sharp impacts. The 360-degree swivel banjo hose fitting on the reservoir line allows the hose to route cleanly without binding or chafing, and the included billet reservoir mount bracket ensures a rattle-free installation finish.

This shock fits all major trim levels of the first-generation Ford Super Duty - including XL, XLT, Lariat, King Ranch, and Harley-Davidson Edition - across all available 4WD powertrains: the 5.4L V8 Triton, 6.8L V10 Triton, 7.3L Power Stroke diesel (1999-2003), and 6.0L Power Stroke diesel (2003-2004). It is strictly a 4WD application and is sized specifically for 4-6 inch lifted front suspensions; it is not intended for stock-height or low-lift configurations. Two units are required for a complete front installation. Note that the front chassis bump stop may require modification to ensure proper shock clearance - verify during installation. For heavy-duty truck owners who have committed to a serious lift and demand more from their suspension than entry-level shocks can offer, the Bilstein B8 5160 is the definitive upgrade.