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

The ICON V.S. 2.5 Aluminum Series Rear Piggyback Shock Absorbers are vehicle-specific performance shocks engineered for 1999–2026 Ford Super Duty trucks running 3–6 inches of rear lift, sold as a pair. Each shock is tuned in both length and damping specifically for this application, combining a nitrogen-charged monotube body with a piggyback reservoir and ICON's proprietary internal Bump Zone technology for controlled, fade-resistant performance on and off pavement.

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: More Control Where It Counts

A 6061 billet aluminum manifold positioned just below the shock's top cap creates an internal Bump Zone that generates an additional 20% of damping force as the shock approaches full compression. That extra resistance helps prevent harsh bottom-outs on rough terrain and keeps the suspension composed during high-velocity compression events. The effect is most noticeable on washboard roads, rocky trails, and the sudden compressions that come with a loaded truck bed.

Heat Dissipation and Consistent Damping

The piggyback reservoir separates the oil volume from the main shock body, giving heat generated during sustained off-road use somewhere to go. Reduced heat buildup means less shock fade on long descents or repeated trail sections. Damping character on mile ten stays closer to what it was on mile one. Premium-grade 5WT shock oil maintains consistent viscosity across a wide temperature range, so the tune holds whether the truck is running desert heat or mountain cold.

Rebuildable, Revalveable, and Upgradeable

Every V.S. 2.5 Aluminum Series shock is 100% rebuildable and 100% revalveable, which means the investment extends well past the initial install. When driving style or terrain changes, the valving can be changed to match rather than replacing the entire shock. For a more user-defined compression tune, the shocks are compatible with ICON's Compression Damping Control Valve (CDCV), available separately. The one-piece impact-extruded aluminum cylinder resists corrosion and holds a consistent finish over time.

Features

• Internal Bump Zone: 6061 billet aluminum manifold adds 20% damping force at full compression to resist bottom-outs
• Piggyback Reservoir: Nitrogen-charged monotube design with separate reservoir for improved heat dissipation and reduced fade
• Vehicle-Specific Valving: Length and damping tune configured specifically for 1999–2026 Ford Super Duty with 3–6" rear lift
• 7/8" Shock Shaft: Induction-hardened, chrome-plated for durability under heavy loads
• PTFE Spherical Bearings: Included with application-specific mounting hardware
• 100% Rebuildable and Revalveable: CDCV-upgradeable for a user-adjustable compression tune

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 vehicle-specific damping tune, fade-resistant performance on extended off-road runs, and a shock they can rebuild or revalve rather than replace outright.

These shocks do not fit F-350 or F-450 cab and chassis models. They are not a match for Super Duty builds outside the 3–6 inch rear lift range, and front shocks are not included. Front fitment requires a separate part.

Common Questions

Which Ford Super Duty model years and configurations do these shocks fit?

The ICON V.S. 2.5 Aluminum Series rear shocks (SKU 37701P) fit 1999–2026 Ford Super Duty trucks with 3–6 inches of rear lift over stock. They do not fit F-350 or F-450 cab and chassis models. Confirm your specific cab, bed, and lift configuration before ordering.

What is the Bump Zone and what does it do?

The Bump Zone is created by a 6061 billet aluminum manifold positioned just below the shock's top cap. As the shock approaches full compression, it generates an additional 20% of damping force. This extra resistance helps prevent harsh bottom-outs and keeps the suspension controlled during high-velocity compression events on rough terrain.

Can these shocks be rebuilt or retuned after installation?

Yes. The ICON V.S. 2.5 Aluminum Series shocks are 100% rebuildable and 100% revalveable. The valving can be changed to suit different terrain or driving styles without replacing the shock body. They are also compatible with ICON's Compression Damping Control Valve (CDCV), sold separately, for user-adjustable compression damping.

What is included with this purchase?

This listing includes two ICON V.S. 2.5 Aluminum Series rear piggyback shocks (a pair) with PTFE-lined spherical bearings and application-specific mounting hardware. The CDCV upgrade and any front shocks are sold separately.

Is there a California Proposition 65 warning for this product?

Yes. California residents should be aware that this product contains chemicals known to the State of California to cause cancer, birth anomalies, or other reproductive harm, as required under Proposition 65.