{"product_id":"qa1-gm-pro-front-coil-over-system-double-adj-10in-x-550lbs-in-flat-aluminum","title":"QA1 GD401-10550B Front Pro Coil Double Adj Coilover Kit 1968-1972 GM A-Body 550","description":"\u003ch4\u003eVehicle Fitment\u003c\/h4\u003e\u003cul\u003e \u003cli\u003e1968-1972 Chevrolet Chevelle, Malibu, El Camino (GM A-Body) - Small Block\u003c\/li\u003e \u003cli\u003e1968-1972 Pontiac GTO, LeMans, Tempest (GM A-Body) - Small Block\u003c\/li\u003e \u003cli\u003e1968-1972 Oldsmobile Cutlass, 442 (GM A-Body) - Small Block\u003c\/li\u003e \u003cli\u003e1968-1972 Buick Skylark, GS (GM A-Body) - Small Block\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment Notes\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eSmall block engine applications - 550 lbs\/in is a stiffer spring rate suited for heavier front axle weight builds (approximately 2,001-2,100 lbs front axle weight); for lighter builds, consider the 400 lbs\/in kit (GD401-10400B)\u003c\/li\u003e \u003cli\u003eBolt-in compatible with both factory OE stamped steel control arms and QA1 tubular control arms - no control arm replacement required\u003c\/li\u003e \u003cli\u003eSome front applications may require the lower A-arm to be dropped for installation; shock body diameter may require enlarging the lower control arm shock opening\u003c\/li\u003e \u003cli\u003eIncludes stud upper \/ T-bar lower mount configuration\u003c\/li\u003e \u003cli\u003eProvides 0 to -2 inches of front ride height adjustability; for additional lowering beyond 2 inches, pair with drop spindles\u003c\/li\u003e \u003cli\u003eRegister shocks at QA1 before installation to activate Limited Lifetime Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFeatures\u003c\/h4\u003e\u003cul\u003e \u003cli\u003eDouble adjustable Pro Coil shock - 18 independent compression positions x 18 independent rebound positions for 324 total valving combinations\u003c\/li\u003e \u003cli\u003eProvides 0 to -2 inches of front ride height adjustability via threaded shock body - adjust with a simple turn of the spring seat nut\u003c\/li\u003e \u003cli\u003eIncludes a 10-inch tapered high travel chrome silicon spring at 550 lbs\/in - ideal for heavier small block A-Body builds needing stiffer front spring rates\u003c\/li\u003e \u003cli\u003eFewer coils and smaller wire diameter vs. conventional springs for increased travel and reduced unsprung weight\u003c\/li\u003e \u003cli\u003eBolt-in with both factory OE and QA1 tubular control arms for maximum build flexibility\u003c\/li\u003e \u003cli\u003eStud upper \/ T-bar lower mount configuration for stock-style front suspension integration\u003c\/li\u003e \u003cli\u003e100% dyno-tested and serialized for verified, consistent performance\u003c\/li\u003e \u003cli\u003eServiceable and rebuildable by QA1 Authorized Service Centers\u003c\/li\u003e \u003cli\u003eMade in the USA at QA1's Lakeville, Minnesota facility\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications\u003c\/h4\u003e\u003cul\u003e \u003cli\u003ePart Number: GD401-10550B\u003c\/li\u003e \u003cli\u003eType: Front Pro Coil Double Adjustable Coilover System\u003c\/li\u003e \u003cli\u003eApplication: 1968-1972 GM A-Body (Small Block)\u003c\/li\u003e \u003cli\u003eShock Model: GD401 Double Adjustable Pro Coil\u003c\/li\u003e \u003cli\u003eCompression Adjustment: 18 positions (independent)\u003c\/li\u003e \u003cli\u003eRebound Adjustment: 18 positions (independent)\u003c\/li\u003e \u003cli\u003eTotal Valving Combinations: 324\u003c\/li\u003e \u003cli\u003eSpring Length: 10 inches (tapered, Style SF - flat upper end)\u003c\/li\u003e \u003cli\u003eSpring Rate: 550 lbs\/in\u003c\/li\u003e \u003cli\u003eSpring Material: Chrome Silicon High Travel\u003c\/li\u003e \u003cli\u003eRide Height Adjustability: 0 to -2 inches\u003c\/li\u003e \u003cli\u003eUpper Mount: Stud Type\u003c\/li\u003e \u003cli\u003eLower Mount: T-Bar Type\u003c\/li\u003e \u003cli\u003eWarranty: Limited Lifetime (register before installation)\u003c\/li\u003e \u003cli\u003eQuantity: Pair (2 shocks + 2 springs)\u003c\/li\u003e \u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eIncluded Components\u003c\/h4\u003e\u003cul\u003e \u003cli\u003e2x QA1 GD401 Double Adjustable Pro Coil Front Shocks (100% Dyno-Tested and Serialized)\u003c\/li\u003e \u003cli\u003e2x 10-Inch Tapered High Travel Chrome Silicon Springs - 550 lbs\/in (Style SF, Black)\u003c\/li\u003e \u003cli\u003e1x Complete Hardware Kit (all required mounting hardware)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eProduct Description\u003c\/h4\u003e\u003cp\u003eThe QA1 GD401-10550B is a double adjustable front Pro Coil coilover system engineered as a bolt-in upgrade for 1968-1972 GM A-Body muscle cars - including the Chevelle, El Camino, GTO, Cutlass, and Skylark - powered by small block engines. This kit is the stiffer spring rate option in the A-Body Pro Coil lineup, pairing the double adjustable GD401 shock with a 550 lbs\/in 10-inch tapered high travel spring to suit heavier front axle weight builds where the 400 lbs\/in rate would be too soft. The double adjustable shocks deliver 324 valving combinations via independent 18-position compression and rebound knobs, accessible by turning the steering wheel to full lock.\u003c\/p\u003e\u003cp\u003eThe 10-inch tapered chrome silicon springs seat against a flat upper end (Style SF) to work with QA1's Pro Coil shock body geometry. This kit installs with both factory OE stamped steel control arms and QA1 tubular control arms - no mandatory control arm replacement needed. Ride height is adjustable from 0 to -2 inches via the threaded shock body spring seat. Each shock is 100% dyno-tested, serialized, and serviceable by QA1 Authorized Service Centers. Register at QA1 before installation to activate the Limited Lifetime Warranty.\u003c\/p\u003e","brand":"QA1","offers":[{"title":"Default Title","offer_id":53499714339135,"sku":"QAPGD401-10550B","price":964.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0832\/7308\/9343\/files\/33808c3c350cba7f8e291778f1f332afL_f5ac217e-244a-4a6a-b649-7bb0fc2d3162.jpg?v=1780440342","url":"https:\/\/wcaperformance.com\/products\/qa1-gm-pro-front-coil-over-system-double-adj-10in-x-550lbs-in-flat-aluminum","provider":"WCA Performance","version":"1.0","type":"link"}