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

The ICON Vehicle Dynamics V.S. 2.5 Aluminum Series rear shocks (SKU 37701CP) are a vehicle-specific piggyback-reservoir shock pair engineered for 1999–2026 Ford Super Duty trucks running 3–6 inches of rear lift. Each shock is tuned in both length and damping specifically for this application, and the pair ships ready to install with application-specific mounting hardware and PTFE-lined spherical bearings.

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.

Bump Zone Technology and CDC Valve Adjustability

A 6061 billet aluminum manifold positioned just below the shock's top cap creates an internal Bump Zone that adds 20% more damping force as the shock approaches full compression. For Super Duty owners who load the bed, tow, or run technical terrain, that extra resistance at the end of the stroke means fewer harsh bottom-outs and more composed suspension behavior under high-velocity compression events. The ICON CDC Valve builds on that foundation with 10 externally adjustable compression damping levels: turn a knob to dial in a softer highway ride or a firmer off-road tune without removing the shock.

Aluminum Construction and Thermal Management

The shock body is machined from one-piece impact-extruded aluminum, which resists corrosion and holds tighter dimensional tolerances than welded steel alternatives. The piggyback reservoir separates the oil volume from the main shock body, improving heat dissipation during sustained off-road use and reducing the fade that builds up when shocks cycle repeatedly at high speed. Premium 5WT shock oil maintains consistent damping across a wide temperature range, so the tune that works on a cold desert morning still holds on a hot afternoon run.

Rebuildable and Revalveable Design

The V.S. 2.5 Aluminum Series shocks are 100% rebuildable and 100% revalveable. A 7/8-inch induction-hardened, chrome-plated shock shaft and CNC-machined 6061 aluminum components are built to be serviced rather than replaced, which matters on a work truck or expedition rig that accumulates serious miles. The nitrogen-charged monotube design with a one-piece digressive piston uses vehicle-specific valving rather than a generic tune, so the shock performs as intended across the full 3–6-inch lift range this application covers.

Features

• 10-Level CDC Valve: externally adjustable compression damping with a single knob turn
• Internal Bump Zone: 6061 billet aluminum manifold adds 20% damping force near full compression
• Piggyback Reservoir: separates oil volume for improved heat dissipation and reduced fade
• 7/8" Chrome Shaft: induction-hardened, chrome-plated for durability and corrosion resistance
• 100% Rebuildable and Revalveable: fully serviceable; application-specific valving throughout
• 5WT Shock Oil: premium grade for consistent damping across a wide temperature range

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 externally adjustable, rebuildable performance shocks capable of handling towing, hauling, and sustained off-road use.

These shocks do not fit F-350 or F-450 cab and chassis models. They are not compatible with stock ride height or lift amounts outside the 3–6-inch range stated for this application.

Common Questions

Which Ford Super Duty model years do these shocks fit?

These ICON V.S. 2.5 Aluminum Series rear shocks are fitment-specific to 1999–2026 Ford Super Duty trucks with 3–6 inches of rear lift. F-350 and F-450 cab and chassis configurations are explicitly excluded from this application.

What lift range do these shocks require?

The ICON 37701CP shocks are calibrated in length and damping tune for 3–6 inches of rear lift on the Ford Super Duty. Running them at stock height or outside that lift range is outside the stated application.

How does the CDC Valve work?

The ICON CDC Valve is an externally adjustable valve that restricts oil flow into the piggyback reservoir. Turning the knob cycles through 10 compression damping levels, letting the driver adjust ride firmness without removing or disassembling the shock.

Can these shocks be rebuilt or revalved?

Yes. The ICON V.S. 2.5 Aluminum Series shocks are 100% rebuildable and 100% revalveable, meaning worn seals, oil, and valving can all be serviced rather than requiring full shock replacement.

Does this listing include a pair of shocks or a single unit?

SKU 37701CP is sold as a pair. Two rear shocks are included, with application-specific mounting hardware and PTFE-lined spherical bearings.

California Residents: This product contains chemicals known to the State of California to cause cancer, birth anomalies, or other reproductive harm (Proposition 65).