ICON Vehicle Dynamics 2007-2021 Toyota Tundra Stage 1 S2 Secondary Shock Upgrade System

The ICON Vehicle Dynamics Stage 1 S2 Secondary Shock Upgrade System adds a vehicle-specific 2.5 Series piggyback reservoir secondary shock to an existing ICON coilover setup on 2007–2021 Toyota Tundra trucks, effectively doubling the front suspension's damping capacity for more confident performance over rough terrain. Note that welding is required at the lower control arm during installation.

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Doubled Damping Without a Long-Travel Overhaul

Adding a secondary shock alongside an existing ICON coilover means the front suspension has twice the damping oil volume and twice the damping force available when it matters most: on washboard roads, over large obstacles, or during high-speed desert running. That increase in damping ability translates directly to better vehicle stability both off-road and on, without the cost or complexity of a full long-travel conversion.

Modular Design, Mostly Bolt-On Installation

The S2 system is built around billet aluminum shock tower adapters, fabricated shock hoops, and steel lower shock mounts. It retains the factory lower control arms and maintains OE track width, so no geometry recalibration is required after installation. The modular approach lets Tundra owners add the secondary shock now and continue upgrading in stages rather than committing to a complete system rebuild at once. One lower control arm weld point is required; plan for that step before starting the install.

Fully Rebuildable 2.5 Series Shocks

The included 57722P 2.5 Series VS piggyback reservoir shocks are vehicle-specifically tuned for the Tundra application. Both shocks are fully rebuildable and revalveable, so valving can be adjusted for changing terrain preferences or the shocks can be serviced after high-mileage use rather than replaced outright.

Features

• 2.5 Series VS piggyback reservoir secondary shocks: vehicle-specifically tuned, increased damping and oil volume over a single-shock setup
• Billet aluminum shock tower adapters: included for a precise, repeatable fit
• Fabricated shock hoops and steel lower mounts: included hardware for a complete secondary-shock installation
• Factory lower control arm retention: maintains OE track width with no geometry changes
• Fully rebuildable and revalveable shocks: serviceable in the field or at a shop
• Modular upgrade path: compatible with a staged build rather than requiring a full system swap

Specifications

Who This Is For and Isn't

This system suits 2007–2021 Toyota Tundra owners who already run an ICON coilover setup on the front suspension and want to add meaningful damping capacity for off-road use without converting to a full long-travel kit. It is a good fit for a staged build where the owner plans to upgrade incrementally.

This system is not compatible with any other aftermarket suspension kit and must not be used in conjunction with non-ICON setups. An existing ICON coilover is required; this is not a stand-alone suspension system. Installation requires welding at the lower control arm; it is not a fully tool-free or drill-free install.

Common Questions

Does this system work without an existing ICON coilover already installed?

No. The Stage 1 S2 Secondary Shock Upgrade System is designed to add a secondary shock to an existing ICON coilover setup on 2007–2021 Toyota Tundra trucks. It is not a stand-alone suspension system and must not be used in conjunction with any other aftermarket suspension kit.

Is welding required to install this system?

Yes. The S2 Secondary Shock Upgrade System requires welding at the lower control arm. Plan for this step before beginning the installation; the system is otherwise a mostly bolt-on upgrade using the included billet aluminum shock tower adapters, fabricated shock hoops, and steel lower shock mounts.

Will the S2 system change the Tundra's track width or require new control arms?

No. The S2 Secondary Shock Upgrade System retains the factory lower control arms and maintains OE track width, so no geometry recalibration is needed after installation on 2007–2021 Toyota Tundra trucks.

Can the included shocks be rebuilt or revalved after extended use?

Yes. The 2.5 Series VS piggyback reservoir shocks included in the S2 system are fully rebuildable and revalveable, allowing valving to be adjusted for different terrain preferences or the shocks to be serviced after high-mileage use rather than replaced.

What tire size is recommended with this system?

The Stage 1 S2 system on the 2007–2021 Toyota Tundra is designed around a 35 x 12.50 inch tire. Larger tires may fit but could require fender trimming and additional modifications.