ICON V.S. 2.5 Series 2011-2016 GM 2500/3500 HD 6-8 Inch Lift Front Extended Travel Shocks Pair

The ICON V.S. 2.5 Series Front Extended Travel Shocks (SKU 77608P, sold as a pair) are vehicle-specific monotube shocks built for 2011–2016 GM 2500/3500 HD trucks running 6–8 inches of front lift. Each shock is individually tuned in both length and damping for this exact application, delivering controlled off-road performance and a composed street ride without compromise.

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

Rather than adapting a generic shock to fit, ICON configures the V.S. 2.5 Series for each vehicle application in both physical length and internal valving. The one-piece digressive piston uses vehicle-specific porting so the shock responds differently at low shaft speeds (where ride quality lives) than at the high shaft speeds generated by sharp trail impacts. For a heavily loaded HD truck navigating washboard or rock, that distinction matters: the suspension stays active under the truck's weight instead of packing down and transmitting shock loads directly to the cab.

2.5 Inch Diameter Advantage Over the 2.0 Series

The larger 2.5 inch bore and increased oil volume of the IR (Internal Reservoir) design give these shocks a measurable heat-dissipation advantage over ICON's V.S. 2.0 Aluminum Series shocks. On extended off-road runs, the kind of sustained high-speed desert or forest-road driving that causes smaller shocks to fade, the additional fluid capacity keeps damping consistent longer. The nitrogen-charged monotube design also eliminates the aeration that causes fade in twin-tube shocks under repeated compression cycles.

Built to Be Serviced, Not Replaced

Both shocks in the pair are 100% rebuildable and 100% revalveable. The 7/8 inch induction-hardened, chrome-plated shock shaft resists scoring from trail debris, and the CAD-plated, precision-machined 1026 DOM steel shock body is built for corrosion resistance over years of use. When damping characteristics eventually need refreshing, or when the owner's use case changes, the shocks can be revalved rather than replaced, which matters on a product at this price point.

Features

• Vehicle-specific valving: length and damping tune set for 2011–2016 GM 2500/3500 HD at 6–8 inches of lift
• 2.5 in nitrogen-charged monotube with internal reservoir: greater oil volume and heat dissipation versus the V.S. 2.0 Series
• One-piece digressive piston: optimized low- and high-speed damping in a single piston assembly
• 7/8 in induction-hardened, chrome-plated shaft: resists corrosion and surface damage
• 6061 aircraft-grade aluminum CNC-machined components: with PTFE-lined spherical bearings and application-specific mounting hardware
• 100% rebuildable and 100% revalveable: premium 5WT shock oil for consistent damping across a wide temperature range

Specifications

Who This Is For and Isn't

These shocks suit 2011–2016 GM 2500/3500 HD owners who have installed or are installing 6–8 inches of front lift and want a rebuildable, application-tuned 2.5 inch monotube shock that performs on both paved roads and demanding off-road terrain.

These shocks do not fit GM 2500/3500 HD trucks outside the 2011–2016 model years, and they are not compatible with stock or mildly lifted trucks below the 6–8 inch lift range. Installation requires aftermarket upper control arms with a high-angle ball joint, which are not included and must be sourced separately. Buyers seeking a user-adjustable compression tune should consider ICON's CDC Valve or Omega Series bypass shocks instead.

Common Questions

Do these shocks fit my 2014 GMC Sierra 2500 HD?

The ICON V.S. 2.5 Series front shocks (77608P) are fitment-confirmed for 2011–2016 GM 2500/3500 HD trucks, which includes the 2014 GMC Sierra 2500 HD, provided the truck is running 6–8 inches of front lift. They are not validated for model years outside that range.

What additional parts are required for installation?

Aftermarket upper control arms with a high-angle ball joint are required to install these extended-travel front shocks on 2011–2016 GM 2500/3500 HD trucks. Those control arms are not included with the pair and must be purchased separately before installation can be completed.

Can these shocks be rebuilt or revalved if they wear out?

Yes. Both shocks in the pair are 100% rebuildable and 100% revalveable. That means worn seals and oil can be replaced, and the internal valving can be changed to suit a different use case or driving style, rather than replacing the entire shock assembly.

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

The V.S. 2.5 Series front shocks use a larger 2.5 inch bore and carry more shock oil than the V.S. 2.0 Aluminum Series IR shocks. The increased diameter and fluid volume improve heat dissipation and ride consistency during sustained off-road use, where smaller shocks are more prone to fade.