{"product_id":"icon-vehicle-dynamics-s2-stage-1-secondary-shock-upgrade-system-for-to","title":"ICON Vehicle Dynamics S2 Stage 1 Secondary Shock Upgrade System for Toyota 4Runner and FJ Cruiser","description":"\u003cp class=\"product-lead\"\u003eThe ICON Vehicle Dynamics S2 Stage 1 Secondary Shock Upgrade System adds a pair of 2.5 Aluminum Series remote reservoir shocks alongside an existing ICON coilover setup on 2010–2024 Toyota 4Runner and 2010–2014 Toyota FJ Cruiser, effectively doubling the vehicle's damping capacity for more demanding off-road terrain. The system is compatible with 0–3.5 inches of front lift over stock and is available as a standalone Stage 1 kit.\u003c\/p\u003e\n\u003cp class=\"product-shipping-note\"\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e 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.\u003c\/p\u003e\n\n\u003ch2\u003eDoubled Damping Without a Long-Travel Overhaul\u003c\/h2\u003e\n\u003cp\u003eAdding a secondary shock to each front corner means the suspension can absorb larger hits and sustain repeated impacts without the primary coilover reaching its limits. The S2 system achieves this without requiring a long-travel conversion: factory lower control arms are retained, OE track width is maintained, and no major frame modification is needed. The result is a meaningful step up in off-road capability at a fraction of the cost and complexity of a full long-travel build.\u003c\/p\u003e\n\n\u003ch2\u003eBuilt to Last and Easy to Move Between Vehicles\u003c\/h2\u003e\n\u003cp\u003eThe secondary shocks use one-piece impact-extruded aluminum cylinders, which resist corrosion and hold a consistent finish over time. Every shock in the S2 system is fully rebuildable and revalveable, so the investment carries forward through future service rather than requiring replacement. Because all S2 components are 100% removable, the system can be transferred to another compatible vehicle if the host truck is sold or traded.\u003c\/p\u003e\n\n\u003ch2\u003eModular Design Lets You Build in Stages\u003c\/h2\u003e\n\u003cp\u003eThe S2 kit's skid plates can be installed independently of the secondary shocks, giving 4Runner and FJ Cruiser owners the option to protect the factory lower control arms from trail damage right away and add the shocks later. Billet aluminum shock tower adapters, fabricated shock hoops, and steel skid plates with incorporated shock mounts make up the mounting hardware. The install is mostly bolt-on, with the exception that welding is required for the lower shock tab and steering stop.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSecondary 2.5 Aluminum Series shocks:\u003c\/strong\u003e remote reservoir design doubles front damping capacity over a coilover-only setup\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOne-piece impact-extruded aluminum cylinders:\u003c\/strong\u003e corrosion-resistant construction with a consistent finish\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFully rebuildable and revalveable shocks:\u003c\/strong\u003e serviceable for long-term use without full replacement\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFactory lower control arms retained:\u003c\/strong\u003e OE track width maintained; no major frame alteration required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e100% removable components:\u003c\/strong\u003e modular design allows transfer to another compatible vehicle\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandalone skid plate installation:\u003c\/strong\u003e LCA skid plates can be fitted independently for trail protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eDetail\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSKU\u003c\/td\u003e\n      \u003ctd\u003eK53121\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eVehicle Fitment\u003c\/td\u003e\n      \u003ctd\u003e2010–2024 Toyota 4Runner; 2010–2014 Toyota FJ Cruiser\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCompatible Lift Range\u003c\/td\u003e\n      \u003ctd\u003e0–3.5 inches of front lift over stock\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSecondary Shock Diameter\u003c\/td\u003e\n      \u003ctd\u003e2.5 in (Aluminum Series)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eShock Construction\u003c\/td\u003e\n      \u003ctd\u003eOne-piece impact-extruded aluminum cylinder with remote reservoir\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eIncluded Components\u003c\/td\u003e\n      \u003ctd\u003eLCA skid plate kit (56106, qty 1); S2 shock hoop kit (56102, qty 1); Toyota S2 secondary 2.5 VS RR pair (59706P, qty 1)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eOEM Wheels and Tires Fitment\u003c\/td\u003e\n      \u003ctd\u003eYes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eShipping Weight\u003c\/td\u003e\n      \u003ctd\u003e60 lb\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWho This Is For and Isn't\u003c\/h2\u003e\n\u003cp class=\"product-fit-yes\"\u003eThe S2 Stage 1 system suits 2010–2024 Toyota 4Runner and 2010–2014 Toyota FJ Cruiser owners who already run an ICON coilover setup and want to increase front damping capacity for more aggressive off-road use without converting to a long-travel suspension. It is compatible with 0–3.5 inches of front lift over stock and works with OEM wheel and tire sizing.\u003c\/p\u003e\n\u003cp class=\"product-fit-no\"\u003eThe S2 system does not fit KDSS-equipped 4Runner or FJ Cruiser vehicles and does not work with the TRD big brake kit. Installation requires welding for the lower shock tab and steering stop, so this is not a fully bolt-on system. Maximum steering angle is reduced as a result of secondary shock compatibility. This kit requires an existing ICON coilover setup and is not a standalone suspension system. California residents: this product contains chemicals known to the State of California to cause cancer, birth anomalies, or other reproductive harm (Proposition 65).\u003c\/p\u003e\n\n\u003ch2\u003eCommon Questions\u003c\/h2\u003e\n\u003ch3 class=\"product-faq-q\"\u003eDoes this system require an existing ICON coilover to be installed first?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eYes. The ICON S2 Stage 1 Secondary Shock Upgrade System adds secondary shocks alongside an existing ICON coilover setup. It is not a standalone suspension system and cannot replace a coilover on its own.\u003c\/p\u003e\n\n\u003ch3 class=\"product-faq-q\"\u003eWill the S2 system fit a 4Runner or FJ Cruiser with KDSS?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eNo. The ICON S2 Stage 1 system does not fit vehicles equipped with KDSS (Kinetic Dynamic Suspension System). Confirm your vehicle's suspension configuration before ordering.\u003c\/p\u003e\n\n\u003ch3 class=\"product-faq-q\"\u003eIs any welding required to install the S2 system?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eYes. Installation of the ICON S2 Stage 1 system requires welding for the lower shock tab and steering stop. The remainder of the install is mostly bolt-on using the included billet aluminum shock tower adapters, fabricated shock hoops, and steel skid plates.\u003c\/p\u003e\n\n\u003ch3 class=\"product-faq-q\"\u003eCan the skid plates be installed without the secondary shocks?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eYes. The modular design of the S2 kit allows the included LCA skid plates to be installed independently, providing protection for the factory lower control arms from trail damage without requiring the secondary shocks to be fitted at the same time.\u003c\/p\u003e\n\n\u003ch3 class=\"product-faq-q\"\u003eWhat lift range is the S2 Stage 1 system compatible with?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe ICON S2 Stage 1 Secondary Shock Upgrade System is compatible with 0–3.5 inches of front lift over stock. Coilover heights referenced in ICON's specifications are based on a stock-equipped vehicle.\u003c\/p\u003e","brand":"ICON Vehicle Dynamics","offers":[{"title":"Default Title","offer_id":50633113862214,"sku":"K53121","price":2153.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/2203\/1686\/files\/2ed83ac5762ceded699509cf5e093c40-sq.jpg?v=1791974776","url":"https:\/\/terrainvault.com\/products\/icon-vehicle-dynamics-s2-stage-1-secondary-shock-upgrade-system-for-to","provider":"TerrainVault","version":"1.0","type":"link"}