ICON V.S. 2.5 Aluminum Series Rear Shock Absorbers for 1999-2026 Ford Super Duty, 3-6" Lift, Pair

The ICON V.S. 2.5 Aluminum Series Rear Shock Absorbers are a vehicle-specific, nitrogen-charged monotube pair built for 1999–2026 Ford Super Duty trucks running 3–6 inches of rear lift, sold as a matched set (SKU 37601P). Each shock is tuned in both length and damping specifically for this Super Duty application, and both are 100% rebuildable and 100% revalveable. These shocks are not compatible with Cab & Chassis models.

Shipping: ICON parts ship direct from ICON Vehicle Dynamics, mostly by UPS Ground. Lead times vary by part and some items are built to order, so please allow extra time. We email tracking as soon as your order ships.

Application-Specific Damping Tune

The V.S. 2.5 Aluminum Series shocks are configured for this exact Super Duty application, not adapted from a universal platform. The one-piece digressive piston carries vehicle-specific valving, which means the damping curve is calibrated for the Super Duty's weight, suspension geometry, and the 3–6 inch lift range. That specificity translates to predictable, consistent response whether the truck is loaded on the highway or working through rough terrain.

Larger Diameter for Better Heat Management

The 2.5-inch aluminum body provides greater oil volume and heat dissipation capacity than the 2.0 Aluminum Series IR shocks. On extended off-road runs or repeated hard compressions, excess heat degrades damping consistency. The larger bore keeps oil temperature lower and performance more stable across those conditions. Premium grade 5WT shock oil maintains consistent damping across a wide temperature range.

Rebuildable and Revalveable Construction

The one-piece impact-extruded 6061 aircraft-grade aluminum cylinder, CNC-machined components, and 7/8-inch induction-hardened chrome-plated shock shaft are all designed to be serviced rather than replaced. PTFE-lined spherical bearings and application-specific mounting hardware are included. When ride preferences or lift height change, the shocks can be revalved rather than replaced, a meaningful cost consideration over the life of a built truck.

Features

• Vehicle-specific valving: one-piece digressive piston tuned in length and damping for this Super Duty application
• 2.5" nitrogen-charged monotube with internal reservoir: greater oil volume and heat dissipation vs. 2.0 Series
• 6061 aircraft-grade aluminum body: impact-extruded one-piece cylinder for corrosion resistance and consistent finish
• 7/8" shock shaft: induction hardened and chrome plated
• PTFE-lined spherical bearings: included with application-specific mounting hardware
• 100% rebuildable and 100% revalveable: fully serviceable per Application Note #150

Specifications

Who This Is For and Isn't

These shocks suit 1999–2026 Ford Super Duty owners running 3–6 inches of rear lift who want a larger-diameter, rebuildable monotube shock tuned specifically for that application, whether the truck sees regular off-road use, towing on rough roads, or both.

These shocks do not fit Ford Super Duty Cab & Chassis models. They are not compatible with stock ride height or lift amounts outside the 3–6 inch rear range. Buyers seeking user-adjustable compression damping should consider ICON's CDC Valve shock option instead.

Common Questions

What Ford Super Duty years and configurations do these shocks fit?

The ICON V.S. 2.5 Aluminum Series Rear Shocks (37601P) fit 1999–2026 Ford Super Duty trucks with 3–6 inches of rear lift over stock. They do not fit Cab & Chassis models. All other Super Duty cab and bed configurations within those model years are the intended application.

What lift height range do these shocks require?

These rear shocks are designed and length-tuned for 3–6 inches of rear lift over stock on the 1999–2026 Ford Super Duty. Running them at stock height or outside that lift range is outside the intended application and may affect performance and fitment.

How do the 2.5 Series shocks differ from ICON's 2.0 Series?

The 2.5-inch body provides a larger oil volume and greater heat dissipation capacity compared to the 2.0 Aluminum Series IR shocks. That larger bore helps maintain more consistent damping during extended or repeated hard use where heat buildup would otherwise affect performance.

Can these shocks be rebuilt or revalved?

Yes. The ICON V.S. 2.5 Aluminum Series shocks are 100% rebuildable and 100% revalveable. The CNC-machined 6061 aluminum components, chrome-plated shaft, and PTFE-lined spherical bearings are designed to be serviced, so valving can be changed if lift height or use preferences change.

What is included in this purchase?

This listing includes a matched pair of ICON V.S. 2.5 Aluminum Series Rear Shock Absorbers with internal reservoirs (SKU 37601P), along with application-specific mounting hardware. An installation guide is available from ICON. No front shocks, springs, or other suspension components are included.