Icon Vehicle Dynamics K53121 Secondary Shock System Lift 0-3.5" Toyota 4Runner 10-24 Pair

ICON Vehicle Dynamics S2 Secondary Shock System

The ICON S2 Secondary Shock System upgrades the suspension performance of the 2010–2024 Toyota 4Runner and 2010–2014 Toyota FJ Cruiser by adding a secondary 2.5 Aluminum Series remote reservoir shock to an existing ICON coilover setup. The additional secondary shocks increase damping capacity and oil volume, improving off-road control and allowing the vehicle to better handle rough terrain and larger obstacles. The modular, mostly bolt-on design enables staged upgrades and straightforward installation.

The system retains factory lower control arms and OE track width while using billet aluminum shock tower adapters, fabricated shock hoops, and steel skid plates with integrated shock mounts. It is designed to avoid major alterations to the vehicle frame or factory suspension components and is fully removable. The skid plates can be installed standalone to protect the factory lower control arms from trail damage.

Key Features

• Increased off-road damping: Secondary shocks effectively double damping capacity for improved control over rough terrain.
• Improved on-road stability: Enhanced damping contributes to greater vehicle stability on pavement.
• Factory compatibility: Utilizes factory lower control arms and maintains OE track width.
• Vehicle-specific tuning: Secondary shocks are tuned for increased damping and oil volume to match vehicle dynamics.
• Durable construction: 2.5 Aluminum Series shocks feature one-piece impact-extruded aluminum cylinders for corrosion resistance and a consistent finish.
• Serviceable shocks: Shocks are fully rebuildable and revalveable.
• Modular, mostly bolt-on design: Enables straightforward installation and flexibility for staged upgrades.

Notes

• OEM wheels and tires fitment: Yes.
• Recommended aftermarket tire size: 33" x 11.50". Larger tires may fit but will require fender trimming and modifications.
• These are stand-alone kits and are not to be used in conjunction with other aftermarket kits.
• Remote reservoir mounting brackets may interfere with aftermarket bumper mounts or windshield washer bottles.
• Shocks are fully serviceable. Coilover heights indicated are for a stock-equipped vehicle.
• Welding required for lower shock tab and steering stop.
• Does not fit KDSS-equipped vehicles.
• Not compatible with TRD big brake kit.
• Maximum steering angle is reduced for secondary shock compatibility.
• Compatible with 0–3.5" of front lift over stock.

Icon Vehicle Dynamics K53121 Secondary Shock System Lift 0-3.5" Toyota 4Runner 10-24 Pair - Features