ICON V.S. 2.5 Series Front Long-Travel Secondary Shocks with Piggyback Reservoir for Toyota 4Runner / Tacoma / FJ Cruiser

The ICON Vehicle Dynamics V.S. 2.5 Series Front Long-Travel Secondary Shocks with Piggyback Reservoir and CDC Valve are application-tuned front secondary shocks sold as a pair, designed for 2003–2024 Toyota 4Runner, 2005–2023 Toyota Tacoma, and 2007–2014 Toyota FJ Cruiser builds running common aftermarket long-travel kits with secondary shock compatibility and a matching secondary shock hoop.

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

Each V.S. 2.5 Series shock is configured in both length and damping tune for its specific vehicle application rather than built to a generic spec. A one-piece digressive piston with vehicle-specific valving calibrates the shock for the actual suspension geometry and weight of the 4Runner, Tacoma, or FJ Cruiser it mounts to, not adapted from a universal platform. The result is predictable, consistent damping whether the truck is loaded for a trip or running empty on a trail.

Bump Zone and CDC Valve Adjustability

A 6061 billet aluminum manifold positioned below the top cap creates an internal Bump Zone that adds 20% of damping force as the shock approaches full compression. That additional resistance helps prevent harsh bottom-outs at high velocity without stiffening the mid-stroke ride. The ICON CDC Valve is an externally adjustable valve that restricts oil flow into the piggyback reservoir, giving 10 levels of compression damping adjustment with a turn of a knob. Selecting a damping level requires no disassembly of the shock.

Heat Management and Long-Term Serviceability

The piggyback reservoir increases oil volume and surface area to dissipate heat during sustained off-road use, reducing shock fade on long descents or repeated high-speed hits. Premium-grade 5WT shock oil maintains consistent damping across a wide temperature range. The nitrogen-charged monotube design uses one-piece impact-extruded aluminum cylinders for corrosion resistance. PTFE-lined spherical bearings and application-specific mounting hardware are included. Both shocks are 100% rebuildable and 100% revalveable, so the investment can be serviced and retuned rather than replaced.

Features

• 10-Level CDC Valve: externally adjustable compression damping with a turn of a knob
• Internal Bump Zone: 6061 billet aluminum manifold adds 20% damping force near full compression
• Piggyback Reservoir: increases oil volume and heat dissipation to reduce fade during prolonged use
• 7/8" Induction-Hardened Shaft: chrome-plated, induction-hardened shock shaft
• 100% Rebuildable and Revalveable: fully serviceable for long-term use
• Application-Specific Valving: length and damping tune set for each vehicle fitment

Specifications

Who This Is For and Isn't

These shocks are for 4Runner, Tacoma, and FJ Cruiser owners already running a common aftermarket long-travel front suspension kit that includes secondary shock compatibility and a matching secondary shock hoop, and who want externally adjustable, rebuildable damping with high-velocity bottom-out control.

These shocks will not fit the ICON S2 Secondary Shock System or any stock-width control arm kit with secondary shock compatibility, even if that kit is otherwise designed for secondary shocks. They are secondary shocks only and are not a replacement for primary front shocks.

Common Questions

Do these shocks replace the primary front shocks?

No. The ICON V.S. 2.5 Series 59701CP-CB are secondary front shocks designed to work alongside primary shocks in a long-travel suspension setup. They require a compatible aftermarket long-travel kit with a secondary shock hoop already installed on the vehicle.

Will these fit the ICON S2 Secondary Shock System?

No. These shocks are explicitly noted as incompatible with the ICON S2 Secondary Shock System. They also will not fit stock-width control arm kits that include secondary shock compatibility, even if those kits accept a secondary shock in another configuration.

What does the CDC Valve do and how is it adjusted?

The CDC Valve on these ICON V.S. 2.5 Series shocks is an externally adjustable valve that restricts oil flow into the piggyback reservoir. Turning the knob selects from 10 levels of compression damping force, allowing the driver to tune ride feel without removing or disassembling the shock.

What is the Bump Zone and why does it matter?

The Bump Zone is created by a 6061 billet aluminum manifold positioned below the top cap of the shock. As the shock approaches full compression, this zone increases damping force by 20%, helping prevent harsh bottom-outs during high-velocity suspension travel without affecting mid-stroke ride quality.

Can these shocks be rebuilt or revalved?

Yes. The ICON V.S. 2.5 Series shocks are 100% rebuildable and 100% revalveable, meaning they can be serviced, retuned, or rebuilt by a qualified shop rather than replaced when they reach the end of a service interval.

Is there a California Proposition 65 warning for this product?

Yes. This product contains chemicals known to the State of California to cause cancer, birth anomalies, or other reproductive harm. This warning is required under California Proposition 65.