ICON V.S. 2.5 Aluminum Front Shocks Remote Reservoir CDXS for 2011-2026 Silverado/Sierra 2500/3500 HD

The ICON V.S. 2.5 Aluminum Series front shock absorbers with remote reservoir and CDXS are application-specific dampers built for 2011–2026 Chevrolet Silverado 2500/3500 HD and GMC Sierra 2500/3500 HD trucks running 0–3.5" of front lift over stock (0–2" on Silverado 2500 ZR2 and Sierra 2500 AT4X). Sold as a pair, each shock is length- and valving-tuned for this exact platform and requires aftermarket front upper control arms for installation.

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Bump Zone Control at High-Velocity Compression

A 6061 billet aluminum manifold positioned just below the top cap creates ICON's internal Bump Zone. As the shock approaches full compression at speed, this zone adds 20% more damping force, reducing harsh bottom-outs and keeping the suspension composed during aggressive off-road driving. For HD trucks that carry loads or tow, that added control at the limit of travel is the difference between a composed landing and a chassis-jarring impact.

Independent High- and Low-Speed Compression Tuning

ICON's CDXS (Compression Damping Dual Speed) valves give separate control over high-speed and low-speed compression damping. Ten detented positions on each adjustment knob let the driver dial in handling response independently from overall aggressiveness: tighten low-speed for body control on highway, open high-speed for compliance on rough terrain, or tune both for a specific load. That range of adjustment means one shock can serve daily driving and weekend trail use without compromise.

Built to Last and Be Serviced

The nitrogen-charged monotube body is machined from one-piece, hard-anodized, impact-extruded 6061 aircraft-grade aluminum for corrosion resistance and dimensional consistency. The 7/8" shock shaft is induction-hardened and chrome-plated. Premium 5WT shock oil maintains consistent damping across a wide temperature range. Every V.S. 2.5 Aluminum Series shock is 100% rebuildable and 100% revalveable, so the investment survives worn seals, a revalve for a new spring rate, or a change in use case. The shock body does not need to be replaced to service the internals.

Features

• Application-specific tune: length and damping calibrated for 2011–2026 Silverado/Sierra 2500/3500 HD with 0–3.5" front lift (0–2" on ZR2/AT4X)
• CDXS valving: 10-position independent adjustment for high-speed and low-speed compression force
• Internal Bump Zone: 6061 billet aluminum manifold adds 20% damping force near full compression
• Nitrogen-charged monotube: remote reservoir improves heat dissipation and reduces fade during extended use
• 7/8" hardened shaft: induction-hardened, chrome-plated for durability and corrosion resistance
• 100% rebuildable and revalveable: fully serviceable; press-in bonded rubber bushing/bar pin assembly for OE-type fitment

Specifications

Who This Is For and Isn't

These shocks suit 2011–2026 Chevrolet Silverado 2500/3500 HD and GMC Sierra 2500/3500 HD owners who have installed or plan to install aftermarket front upper control arms and are running up to 3.5" of front lift (up to 2" on ZR2 and AT4X variants). They are well matched to drivers who want independent compression tuning for mixed on-road and off-road use.

These shocks do not fit any other make, model, or generation. Aftermarket front upper control arms are required; the shocks are not compatible with stock front upper control arms. Upper control arms, springs, and all other suspension components are sold separately and are not included.

Common Questions

Do these shocks work with the factory front upper control arms?

No. The ICON V.S. 2.5 Aluminum Series front shocks for 2011–2026 Silverado/Sierra 2500/3500 HD require aftermarket front upper control arms. The extended travel length of these shocks exceeds what stock upper control arms can accommodate, so aftermarket arms must be installed before or alongside these shocks.

What lift heights are compatible with these shocks?

On most 2011–2026 Silverado 2500/3500 HD and Sierra 2500/3500 HD submodels, these shocks are compatible with 0–3.5" of front lift over stock. On the Chevrolet Silverado 2500 ZR2 and GMC Sierra 2500 AT4X specifically, compatibility is limited to 0–2" of front lift over stock.

What does CDXS mean and how is it adjusted?

CDXS stands for Compression Damping Dual Speed. On these ICON shocks, it refers to two separate adjustment knobs (one for high-speed compression and one for low-speed compression), each with 10 detented positions. Adjusting them independently lets the driver tune handling response and overall suspension aggressiveness separately without affecting rebound.

What is the Bump Zone and when does it activate?

The Bump Zone is created by a 6061 billet aluminum manifold positioned just below the top cap of each shock. As the shock approaches full compression during high-velocity impacts such as a hard landing or fast trail section, the Bump Zone increases damping force by 20%, helping prevent harsh bottom-outs and keeping the suspension controlled at the limit of travel.

Can these shocks be rebuilt or revalved?

Yes. Every ICON V.S. 2.5 Aluminum Series shock is 100% rebuildable and 100% revalveable. Worn seals can be replaced, and the valving can be changed if the truck's use case or spring rate changes. The shock body does not need to be replaced to service the internals.

How many shocks are included?

This listing includes a pair of two front shock absorbers. Upper control arms, coil springs, and any other suspension components are sold separately and are not included in this set.