FOX Race Series Reservoir Rear Shocks Ford Super Duty F-250/350 4-6" Lift
2017–2026 Ford F-250 / F-350 Rear Fox 2.5 Factory Race Series Reservoir Shocks (4–6” Lift)
Upgrade your Super Duty’s rear suspension with Fox Factory Race Series 2.5 Reservoir Shocks—engineered for serious performance both on and off the road.
Built from FOX’s race-proven off-road technology, these shocks deliver exceptional control, improved damping, and consistent performance under extreme conditions. The external reservoir design increases oil and nitrogen capacity, helping reduce fade while maintaining smooth, controlled ride quality even under heavy use.
Whether you're towing, daily driving, or pushing your truck off-road, these shocks provide the confidence and performance your suspension needs.
Key Features
- Fox Factory Race Series 2.5 remote reservoir shocks
- Designed for 4”–6” lifted Super Duty trucks
- External reservoir increases oil capacity and cooling
- Race-developed high-flow piston for improved damping control
- Application-specific valving for optimal ride quality
- 7/8" hard chrome plated shaft for strength and durability
- CNC-machined billet aluminum components with black anodized finish
- Zinc-plated seamless steel body with double-clear coat protection
- Bolt-on installation for rear suspension applications
Specifications
- Series: Factory Race Series
- Shock Type: 2.5 Reservoir Smooth Body
- Position: Rear
- Lift Range: 4"–6"
- Travel: 13.56"
- Extended Length: 35.01"
- Compressed Length: 21.45"
- Mounting: Eyelet / Eyelet
Construction Details
- Body: 2.5" smooth bore zinc-plated seamless steel
- Finish: Double clear-coated for long-term corrosion resistance
- Shaft: 7/8" heat-treated alloy steel with hard chrome plating
- Piston: Race-developed high-flow design
- Valving: Vehicle-specific tuning for maximum performance
- Sealing System: Multi-layer redundant seal pack (main, wiper, scraper)
- Bearings: PTFE-lined spherical bearings for smooth articulation
Fitment
2017–2026 Ford F-250 Super Duty (4WD)
2017–2025 Ford F-350 Super Duty (4WD)
- Fits rear suspension
- Designed for trucks with 4”–6” lift kits
- Compatible with most aftermarket lift systems
Installation
- Difficulty: Moderate
- Estimated Time: 1–2 hours
- Install Type: Direct bolt-on
Factory mounting hardware may be reused unless otherwise specified
What’s Included
- (2) Fox 2.5 Factory Race Series Rear Reservoir Shocks
- Reservoir mounting hardware (if applicable)
Built Right. Backed Right.
Our crew’s on call Monday–Friday, 9–5 EST. Hit us up at 865-983-5004 — real support, done right.
Why Fox Shocks
Fox shocks are well-regarded in the off-road and performance world because they combine durability, advanced damping technology, and customization options that suit a wide range of vehicles and driving styles. For 4WD trucks, the “best” Fox shocks depend on how you actually use the truck — daily driving, towing, trail riding, or hardcore off-road.
Performance Series
Yes
No
Fox Shocks FAQ's
Should I Get 2.0 or 2.5 Shocks
Choose Fox 2.0 if:
You prioritize a smoother daily ride.
You stick to moderate trails and lighter off-road use.
Budget-friendly performance is key.
Choose Fox 2.5 if:
You demand more from your suspension—like aggressive off-roading, towing, or extended high-speed use.
You need better heat management and durability.
You don’t mind paying a bit more for enhanced performance and longevity.
Why Monotube Shocks Excel on Lifted Trucks
Handles Added Unsprung Weight – Larger wheels/tires from a lift add rotational mass and stress to your suspension. Monotube designs have better damping control to keep those tires planted.
Better Heat Dissipation – The single-tube design allows oil and gas to cool more efficiently, preventing fade during towing, off-roading, or long highway runs.
More Precise Handling – They respond faster to suspension movement, which is critical when correcting for body roll in a taller truck.
Will Better Shocks Improve Ride Quality
Tightening Up a Floaty Vehicle
If your truck feels like it’s “floating” or wandering at highway speeds, new shocks will firm up the suspension, improve steering response, and keep the body from rolling excessively in turns.
This doesn’t necessarily make the ride softer — it makes it more controlled.
Reducing Harsh Bouncing & Jarring
If you’re feeling hard bounce after hitting a bump (especially front or rear “pogo stick” motion), your shocks likely have lost rebound damping.
New shocks restore that damping, keeping your tires on the ground and absorbing energy before it reaches you.
Why Measure Shocks and Lift Height
1. Improved Ride Comfort
Matching the right shocks to your truck’s lift height enhances ride comfort. Ill-fitting shocks can cause a harsh, bumpy ride and limit suspension travel.
2. Better Handling & Control
Shocks sized for your lift height improve steering stability, cornering, and overall control — especially on rough terrain or with larger tires.
3. Increased Safety
The right shocks keep your tires in consistent contact with the ground, reducing the risk of skids, loss of control, or suspension component damage.
4. Greater Durability
When shocks operate within their intended range, they last longer and protect other suspension parts from premature wear.
5. Optimal Performance
A well-matched suspension setup ensures your truck performs at its best, whether you’re off-roading, towing, hauling, or commuting daily.