

Fox 2017-2026 Ford F-250/350 Super Duty 2.5 Performance Series Rear Shock 4-6in. Lift
2017–2026 Ford F-250/F-350 Super Duty Rear Fox Performance Elite Series 2.5 Reservoir Shock (4–6” Lift) 2wd & 4wd
Upgrade your suspension with race-proven performance and precision control. The Fox Performance Elite Series 2.5 Reservoir Shock is engineered to deliver exceptional ride quality both on and off the pavement. Drawing directly from FOX’s off-road racing heritage, these shocks are built to perform under extreme conditions—far beyond what most drivers will encounter—while giving your truck the confidence, control, and durability needed for any terrain.
Key Features
- Performance tuned for vehicle-specific applications
- 2.5" smooth body, impact-extruded and CNC-machined 6061-T6 aluminum construction
- Hard-anodized body for corrosion resistance and long-term durability
- External reservoir for improved cooling and consistent damping
- Increased oil and nitrogen capacity for fade resistance under heavy use
- Black-anodized CNC-machined 6061-T6 billet aluminum components
- 7/8" hard chrome plated heat-treated alloy steel shaft
- Race-developed high-flow piston design
- Application-specific valving for optimized performance
- Redundant sealing system (main seal, wiper seal, scraper seal)
- PTFE-lined, heat-treated alloy steel spherical bearings
- Eyelet upper and lower mounts
- Designed for 4–6" rear lift applications
- 13.58" travel
- Extended length: 34.93"
- Collapsed length: 21.35"
Construction & Design
Built with a smooth body 2.5-inch shock design, the Performance Elite Series features an external reservoir that significantly increases oil and nitrogen volume. This allows for better heat dissipation and more consistent damping during aggressive driving or extended use. The reservoir not only improves performance but also delivers a clean, race-inspired look.
Performance Benefits
- Superior ride quality on and off-road
- Increased suspension control in rough terrain
- Reduced shock fade during extended or aggressive use
- Confidence-inspiring handling for heavy-duty trucks
- Race-proven durability and reliability
Installation
Estimated Install Time: 1–2 hours
These shocks are designed as a direct bolt-on replacement, making installation straightforward with standard hand tools.
Fitment
Ford Super Duty Rear (4–6” Lift Applications):
Fits 2WD & 4WD Models
- 2025 Ford F-250 Super Duty (King Ranch, Lariat, Platinum, XLT)
- 2023–2026 Ford F-350 Super Duty (King Ranch, Platinum)
- 2018–2024 Ford F-350 Super Duty Limited
4WD Models Only
- 2017–2026 Ford F-250 Super Duty
Includes:
XL (2025), All Trims (2017–2024, 2026)
- 2017–2026 Ford F-350 Super Duty
Trims Include:
King Ranch (2017–2022),
Lariat (2017–2026),
Platinum (2017–2022),
XL (2017–2026),
XLT (2017–2026)
What’s Included
- (2) Fox Performance Elite Series 2.5 Reservoir Rear Shocks
Installation Notes
- Install on a properly supported vehicle
- Torque all hardware to manufacturer specifications
- Alignment may be recommended after installation

