{"product_id":"qa1-3-1-2in-id-tapered-spring-8in-length-x-600lbs-in-chrome-plated","title":"QA1 8MB600 Tapered Chrome Coil Spring 600 lb. 8 in. for Mustang II Coil-Over","description":"\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eUniversal - Designed for vehicles equipped with a Mustang II independent front suspension (IFS) coil-over conversion system using a 3.5 in. upper \/ 2.5 in. lower tapered coil-over seat.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment Notes\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eThis is a semi-universal spring designed for Mustang II coil-over systems - verify your shock's collapsed length, extended length, and seat I.D. before ordering to confirm compatibility.\u003c\/li\u003e \u003cli\u003eDesigned specifically for use with QA1 Mustang II Pro Coil coil-over kits featuring a 3.5 in. upper and 2.5 in. lower tapered spring seat.\u003c\/li\u003e \u003cli\u003eNot a direct vehicle-specific replacement spring - fitment depends on the coil-over system installed in the vehicle, not the vehicle's original OE spring spec.\u003c\/li\u003e \u003cli\u003eAvailable in multiple spring rates in the 8MB series: 8MB400, 8MB500, 8MB600, and 8MB700 - select rate based on vehicle weight, spring perch travel, and handling goal.\u003c\/li\u003e \u003cli\u003eFor LS1-heavy front ends or performance builds with heavier front-end weight, the 600 lb. rate is commonly paired with QA1 GS401 or equivalent Mustang II coil-over shocks.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFeatures\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eManufactured from chrome silicon steel (CrSi) for maximum strength, consistency, and long service life under high-stress coil-over use.\u003c\/li\u003e \u003cli\u003eCold wound, heat-treated, and shot-peened during production for precise rate accuracy and fatigue resistance.\u003c\/li\u003e \u003cli\u003eTapered design with 3.5 in. upper I.D. and 2.5 in. lower I.D. fits QA1 Mustang II coil-over seats without adapters.\u003c\/li\u003e \u003cli\u003eSquared and ground ends ensure straight, consistent spring operation and accurate rate delivery.\u003c\/li\u003e \u003cli\u003eChrome-plated finish provides a polished, show-quality appearance and corrosion protection.\u003c\/li\u003e \u003cli\u003eLifetime guaranteed to remain within 2% of original free height and rate under normal operating conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eSpring Rate: 600 lbs.\/in.\u003c\/li\u003e \u003cli\u003eFree Length: 8 in. (203.2 mm)\u003c\/li\u003e \u003cli\u003eUpper I.D.: 3.5 in. (88.9 mm)\u003c\/li\u003e \u003cli\u003eLower I.D.: 2.5 in. (63.5 mm)\u003c\/li\u003e \u003cli\u003eSpring Style: Tapered (Mustang II)\u003c\/li\u003e \u003cli\u003eMaterial: Chrome Silicon Steel (CrSi)\u003c\/li\u003e \u003cli\u003eFinish: Chrome Plated\u003c\/li\u003e \u003cli\u003eProgressive Rate: No (linear rate)\u003c\/li\u003e \u003cli\u003eQuantity: Sold Individually\u003c\/li\u003e \u003cli\u003eShipping Weight: 5.42 lbs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eIncluded Components\u003c\/h4\u003e\u003cul\u003e \u003cli\u003e1x Tapered Chrome Coil Spring (8 in., 600 lb.\/in.)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Description\u003c\/h4\u003e\u003cp\u003e The QA1 8MB600 is a tapered chrome silicon coil spring engineered for Mustang II independent front suspension coil-over conversion systems. With an 8 in. free length, 600 lb.\/in. linear rate, and a tapered profile measuring 3.5 in. at the upper seat and 2.5 in. at the lower seat, it fits directly into QA1 Mustang II Pro Coil coil-over kits without adapters or modification. Chrome silicon steel construction, combined with a cold winding, heat treating, and shot peening process, delivers a spring that holds its rate and free height with exceptional consistency - QA1 backs this with a lifetime guarantee to within 2% of the original free height and rate under normal use.\u003c\/p\u003e\u003cp\u003e The 600 lb.\/in. rate is a popular choice for heavier-nosed builds including big block or LS-swapped hot rods, street rods, and classic trucks where the front end carries more weight. The polished chrome plated finish gives the spring a show-quality appearance that pairs well with exposed front suspension builds. This spring is sold individually - most Mustang II IFS setups require two. The 8MB series is also available in 400, 500, and 700 lb.\/in. rates to match a wide range of build weights and handling targets.\u003c\/p\u003e","brand":"QA1","offers":[{"title":"Default Title","offer_id":53499712569663,"sku":"QAP8MB600","price":114.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/7308\/9343\/files\/665a5bd330dbaf79575d03c4d793356e.jpg?v=1780440328","url":"https:\/\/wcaperformance.com\/products\/qa1-3-1-2in-id-tapered-spring-8in-length-x-600lbs-in-chrome-plated","provider":"WCA Performance","version":"1.0","type":"link"}