ICON V.S. 2.5 Aluminum Rear Piggyback Shocks with CDCV for 2019-2026 Silverado 1500 / Sierra 1500

The ICON Vehicle Dynamics V.S. 2.5 Aluminum Series rear shock absorbers (SKU 77703CP) are a vehicle-specific piggyback-reservoir pair built for 2019–2026 Chevrolet Silverado 1500 and GMC Sierra 1500 trucks running 0–2 inches of rear lift, combining a 2.5-inch aluminum monotube body with ICON's externally adjustable CDC Valve for 10 levels of compression damping. Sold as a pair, these shocks are application-tuned in both length and damping valving for this exact truck platform.

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Tunable Compression Damping On the Trail

The ICON CDC (Compression Damping Control) Valve is an externally adjustable valve that restricts oil flow into the piggyback reservoir, producing 10 distinct levels of compression damping force with a turn of a knob. No disassembly is required. That range lets a Silverado or Sierra owner dial in a softer setting for daily highway miles and step up to a firmer tune before a loaded haul or a rough dirt road, without swapping components or visiting a shop.

Bump Zone Technology Prevents Harsh Bottom-Outs

A 6061 billet aluminum manifold positioned just below the shock's top cap creates an internal Bump Zone that adds 20% of damping force as the shock approaches full compression. At high-velocity compression events (sharp whoops, sudden drop-offs, or a heavily loaded bed hitting a dip), that extra resistance absorbs the spike before it transfers to the frame, reducing the jarring bottom-out that wears on both the truck and the driver over a long day off-road.

Built to Last and Be Serviced in the Field

The 2.5-inch cylinder is a one-piece, hard-anodized, impact-extruded aluminum construction that resists corrosion and holds a consistent finish under prolonged exposure. The 7/8-inch shock shaft is induction-hardened and chrome-plated for durability against debris and side-loading. PTFE-lined spherical bearings handle articulation without binding. Premium 5WT shock oil maintains consistent damping across a wide temperature range. Every V.S. 2.5 Series shock is 100% rebuildable and 100% revalveable, so the unit can be serviced or retuned rather than replaced when it eventually needs attention.

Features

• CDC Valve: externally adjustable compression damping with 10 selectable force levels
• Internal Bump Zone: 6061 billet aluminum manifold adds 20% damping force near full compression
• Piggyback Reservoir: nitrogen-charged monotube design with external reservoir for improved heat dissipation and reduced shock fade
• 7/8" Hardened Shaft: induction-hardened, chrome-plated for durability and corrosion resistance
• Aircraft-Grade Aluminum Construction: CNC-machined 6061 components and hard-anodized impact-extruded cylinder
• Fully Rebuildable and Revalveable: 100% serviceable; PTFE-lined spherical bearings and vehicle-specific mounting hardware included

Specifications

Who This Is For and Isn't

These rear shocks suit 2019–2026 Chevrolet Silverado 1500 and GMC Sierra 1500 owners running 0–2 inches of rear lift who want externally adjustable compression damping and a rebuildable, reservoir-equipped shock for mixed on-road and off-road use. Trail Boss and AT4 owners running zero rear lift are also compatible.

These shocks are not compatible with the Silverado 1500 ZR2 or Sierra 1500 AT4X submodels. Trucks equipped with the factory Adaptive Ride Control system require additional parts (ICON part numbers 71021 and 71022) and concurrent installation of aftermarket front coilovers; this pair alone is not sufficient for an Adaptive Ride Control vehicle. This listing covers rear shocks only; front components are sold separately.

Common Questions

Will these fit my Silverado 1500 Trail Boss or Sierra 1500 AT4?

The ICON V.S. 2.5 rear shocks (SKU 77703CP) are compatible with Trail Boss and AT4 submodels, but only at zero inches of rear lift, not at the 0–2 inch range available on most other Silverado 1500 and Sierra 1500 configurations. Confirm your current lift height before ordering.

Are these compatible with the Silverado 1500 ZR2 or Sierra 1500 AT4X?

No. The ICON V.S. 2.5 Aluminum Series rear shocks (SKU 77703CP) are explicitly not compatible with the Silverado 1500 ZR2 or Sierra 1500 AT4X submodels. Owners of those trucks should contact TerrainVault to identify the correct ICON application.

My truck has the factory Adaptive Ride Control system. Can I install these?

Silverado 1500 and Sierra 1500 trucks equipped with Adaptive Ride Control require two additional components (ICON part numbers 71021 and 71022) and must also have aftermarket front coilovers installed at the same time. These rear shocks alone are not a complete solution for an Adaptive Ride Control vehicle.

How does the CDC Valve compression adjustment work?

The ICON CDC Valve is an externally mounted valve on the piggyback reservoir that restricts oil flow between the shock body and the reservoir. Turning the knob selects one of 10 compression damping force levels. Adjustment requires no disassembly of the shock.

What is the Bump Zone, and why does it matter?

The Bump Zone is an internal feature created by a 6061 billet aluminum manifold positioned just below the shock's top cap. As the shock nears full compression, oil is routed through this manifold, generating 20% more damping force than the baseline tune. The result is a progressive resistance that cushions hard bottom-outs rather than letting the suspension slam against its travel limit.

Can these shocks be rebuilt or revalved later?

Yes. Every ICON V.S. 2.5 Series shock is 100% rebuildable and 100% revalveable. When seals wear or a different damping tune is needed, the shock can be serviced or revalved rather than replaced, which extends the usable life of the unit and allows tuning adjustments as the truck's use case changes.

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