{"product_id":"icon-v-s-2-5-piggyback-cdc-rear-shocks-for-2007-2018-gm-1500-pair","title":"ICON V.S. 2.5 Piggyback CDC Rear Shocks for 2007-2018 GM 1500, Pair","description":"\u003cp class=\"product-lead\"\u003eThe ICON Vehicle Dynamics V.S. 2.5 Aluminum Series Piggyback Reservoir Shocks with CDC Valve are a vehicle-specific rear shock pair engineered for 2007–2018 GM 1500 trucks running 0–1.5 inches of rear lift. Each shock is tuned in both length and damping specifically for this application, combining a nitrogen-charged monotube body with a piggyback reservoir and ICON's externally adjustable CDC Valve for on-the-fly compression control.\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\u003eBump Zone Technology Prevents Harsh Bottom-Outs\u003c\/h2\u003e\n\u003cp\u003eA 6061 billet aluminum manifold positioned below the top cap creates an internal Bump Zone that increases damping force by 20% as the shock approaches full compression. For a GM 1500 used off-road at speed, that progressive resistance means the suspension slows down before it runs out of travel rather than slamming to a stop, reducing chassis stress and keeping the truck composed over repeated hits.\u003c\/p\u003e\n\n\u003ch2\u003eTen Levels of Compression Adjustment\u003c\/h2\u003e\n\u003cp\u003eThe CDC (Compression Damping Control) Valve is an externally adjustable knob that restricts oil flow into the piggyback reservoir, producing 10 distinct compression damping ranges. Dialing up adds resistance for loaded hauling or high-speed trail running; dialing down softens the ride for daily driving. No tools are required, and the shock does not need to be removed to make the adjustment. The piggyback reservoir also improves heat dissipation during prolonged off-road use, reducing shock fade when the suspension is working hardest.\u003c\/p\u003e\n\n\u003ch2\u003eBuilt to Be Rebuilt\u003c\/h2\u003e\n\u003cp\u003eThe V.S. 2.5 shocks use a one-piece digressive piston, a 7\/8-inch induction-hardened chrome-plated shaft, PTFE-lined spherical bearings, and one-piece impact-extruded aluminum cylinders. Premium 5WT shock oil maintains consistent damping across a wide temperature range. Every unit is 100% rebuildable and 100% revalveable, so the shock can be serviced and retuned rather than replaced when wear or a change in use case demands it.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCDC Valve:\u003c\/strong\u003e 10-level external compression damping adjustment with a single knob\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInternal Bump Zone:\u003c\/strong\u003e 6061 billet aluminum manifold adds 20% damping force near full compression\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePiggyback Reservoir:\u003c\/strong\u003e nitrogen-charged monotube with separate reservoir for improved heat dissipation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e7\/8\" Hardened Shaft:\u003c\/strong\u003e induction-hardened, chrome-plated for durability and corrosion resistance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePTFE Spherical Bearings:\u003c\/strong\u003e application-specific mounting hardware included\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRebuildable and Revalveable:\u003c\/strong\u003e fully serviceable; 5WT shock oil for wide-temperature consistency\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\u003e77700CP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eShock Body Diameter\u003c\/td\u003e\n      \u003ctd\u003e2.5 in\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eShaft Diameter\u003c\/td\u003e\n      \u003ctd\u003e7\/8 in\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eShaft Material\u003c\/td\u003e\n      \u003ctd\u003eInduction-hardened, chrome-plated steel\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBody Material\u003c\/td\u003e\n      \u003ctd\u003e6061 aircraft-grade aluminum (CNC machined)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eShock Oil\u003c\/td\u003e\n      \u003ctd\u003ePremium grade 5WT\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eCompression Adjustment\u003c\/td\u003e\n      \u003ctd\u003e10 levels (external CDC Valve)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBump Zone Damping Increase\u003c\/td\u003e\n      \u003ctd\u003e20% additional force near full compression\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eVehicle Fitment\u003c\/td\u003e\n      \u003ctd\u003e2007–2018 GM 1500\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eLift Range\u003c\/td\u003e\n      \u003ctd\u003e0–1.5 in rear lift\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eQuantity\u003c\/td\u003e\n      \u003ctd\u003ePair (2 shocks)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eShipping Weight\u003c\/td\u003e\n      \u003ctd\u003e25 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\"\u003eThese shocks suit 2007–2018 GM 1500 owners running 0–1.5 inches of rear lift who want adjustable, rebuildable performance shocks for mixed on-road and off-road use, including loaded hauling, high-speed trail driving, and daily driving where ride quality matters.\u003c\/p\u003e\n\u003cp class=\"product-fit-no\"\u003eThese shocks are not compatible with GM 1500 models equipped with Magnetic Ride Control, are not recommended for Hybrid model variants, and are not a fit for trucks with more than 1.5 inches of rear lift. Installation may require slight modifications to the rear shock absorber mounts. California residents: this product contains chemicals known to the State of California to cause cancer, birth anomalies, or other reproductive harm (Prop 65).\u003c\/p\u003e\n\n\u003ch2\u003eCommon Questions\u003c\/h2\u003e\n\u003ch3 class=\"product-faq-q\"\u003eWhat GM 1500 model years do these shocks fit?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe ICON V.S. 2.5 Piggyback CDC rear shocks (SKU 77700CP) are fitment-specific to 2007–2018 GM 1500 trucks with 0–1.5 inches of rear lift. They are not compatible with Magnetic Ride Control-equipped models and are not recommended for Hybrid variants of that generation.\u003c\/p\u003e\n\n\u003ch3 class=\"product-faq-q\"\u003eHow does the CDC Valve adjustment work?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe CDC (Compression Damping Control) Valve is an external knob on the piggyback reservoir that restricts oil flow between the shock body and reservoir. Turning it cycles through 10 distinct compression damping levels, with no tools required, allowing the driver to firm up for off-road or loaded use and soften for daily driving without removing the shock.\u003c\/p\u003e\n\n\u003ch3 class=\"product-faq-q\"\u003eWhat is the Bump Zone and why does it matter?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe Bump Zone is created by a 6061 billet aluminum manifold positioned below the shock's top cap. As the shock nears full compression, this manifold increases damping force by 20%, progressively slowing suspension travel before it bottoms out. For high-speed off-road use, that means less harsh impact on the chassis and better control through repeated compression events.\u003c\/p\u003e\n\n\u003ch3 class=\"product-faq-q\"\u003eAre these shocks rebuildable?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eYes. The ICON V.S. 2.5 Aluminum Series shocks are 100% rebuildable and 100% revalveable. The one-piece digressive piston, 5WT shock oil, and CNC-machined aluminum components are all serviceable, meaning the shocks can be rebuilt or retuned to a different valving specification rather than replaced outright.\u003c\/p\u003e\n\n\u003ch3 class=\"product-faq-q\"\u003eWhat mounting hardware is included?\u003c\/h3\u003e\n\u003cp class=\"product-faq-a\"\u003eThe ICON V.S. 2.5 Piggyback CDC rear shock pair includes PTFE-lined spherical bearings and application-specific mounting hardware for the 2007–2018 GM 1500 fitment. Slight modifications to the rear shock absorber mounts may be required during installation.\u003c\/p\u003e","brand":"ICON Vehicle Dynamics","offers":[{"title":"Default Title","offer_id":50630725435462,"sku":"77700CP","price":1525.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/2203\/1686\/files\/467f3a6a294ef2dad0b0a13fb67295ec_db889f78-f417-414e-ae89-b1d-sq.jpg?v=1791960227","url":"https:\/\/terrainvault.com\/products\/icon-v-s-2-5-piggyback-cdc-rear-shocks-for-2007-2018-gm-1500-pair","provider":"TerrainVault","version":"1.0","type":"link"}