Description

1999–2016 Ford F-250/F-350/F-450/F-550 Super Duty Rear Fox 2.5 Factory Race Series Reservoir Shock

Upgrade your suspension with race-proven performance from FOX. The Factory Race Series 2.5 Reservoir smooth body shocks deliver enhanced ride quality and the control you need when heading off the pavement. Built using technology derived from FOX’s off-road race shocks, these dampers have been tested and refined in extreme conditions to provide consistent, reliable performance for your truck or SUV.

The external reservoir increases oil and nitrogen capacity, improving heat dissipation and damping consistency while also delivering a true race-inspired look. Designed for both stock and lifted applications, these bolt-on shocks provide precise control and improved handling across any terrain. Experience the confidence and performance that comes from FOX’s competition-driven engineering.

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Key Features

2.5” Smooth Body Shock Design
Large diameter body increases oil capacity for better cooling and consistent damping under heavy use.

External Reservoir
Improves thermal performance and reduces shock fade during aggressive driving or off-road use.

Race-Proven Performance
Derived directly from FOX off-road racing technology and tested in extreme conditions.

Application-Specific Valving
Tuned to maximize ride quality, control, and performance for your specific vehicle.

Bolt-On Installation
Designed for straightforward installation using factory mounting locations.

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Specifications

• Series: Factory Race Series
• Travel: 11.37″
• Body: 2.5″ smooth bore zinc-plated seamless steel body
• Body Plating: Zinc-plated and double clear coated for long-lasting finish
• Components: Black-anodized CNC-machined 6061-T6 billet aluminum
• Shaft: 7/8″ hard chrome plated heat-treated alloy steel
• Piston: Race-developed high-flow piston design
• Valving: Application-specific valving to maximize performance
• Seals: Redundant sealing pack system (main seal, wiper seal, scraper seal)
• Bearings: PTFE-lined, heat-treated alloy steel spherical bearings
• Extended Length: 29.83″
• Compressed Length: 18.46″
• Top Mount: Eyelet
• Bottom Mount: Eyelet

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Fitment

Ford F-250 Super Duty (1999–2016) – 4WD – Rear

• Fits 0″–1.5″ lift

Ford F-350 Super Duty (1999–2016) – 4WD – Rear

• Fits 0″–1.5″ lift (most applications)
• Fits 2.5″–4″ lift (2012–2013, 2016 models)

Ford F-450 Super Duty (2005–2016) – Rear

• Fits 4.5″–5.5″ lift (most applications)
• Fits 1.5″–2.5″ lift (2010, 2012, 2016 models)

Ford F-550 Super Duty (2005–2016) – Rear

• Fits 4.5″–5.5″ lift

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Installation

• Estimated Install Time: 1–2 hours
• Difficulty Level: Easy to Moderate
• Tools Required: Basic hand tools
• Hardware: Typically reuses factory mounting hardware unless otherwise specified

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Notes

• Designed for stock and lifted applications
• Sold individually unless otherwise noted
• External reservoir requires proper routing and mounting
• Always verify fitment before purchase

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