{"product_id":"qa1-qapms303-ms303-mustang-ii-pro-front-coil-over-shock","title":"QA1 Ford Mustang II Pro Front Coil-Over Shock Absorber (7\/16in Bushing) - Single Adj. - 7.88in\/11in","description":"\u003ch4\u003eMustang II Front Coil-Over Conversion Shock for Hot Rods and Classic Fords\u003c\/h4\u003e\n\u003cp\u003eThe QA1 QAPMS303 MS303 Pro Front Coil-Over Shock is purpose-built for 1974-1978 Ford Mustang II front suspension setups and the countless custom hot rods, street rods, and kit cars that have adopted Mustang II front clip geometry. Using a 7\/16 inch lower bushing mount, the QAPMS303 drops directly into Mustang II-style spindles and control arms with no fabrication. The MS303 shock body is crafted from lightweight billet aluminum, features 18 single-adjustable valving positions, and a fully threaded body for 0 to 2 inches of ride height adjustment. At 7.88 inches compressed and 11 inches extended, the QAPMS303 is sized for proper travel geometry within Mustang II front suspension packaging. Sold as a single shock without springs. Every QA1 MS303 is 100% dyno tested, serialized, and backed by QA1's Limited Lifetime Warranty.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e7\/16 inch lower bushing mount for direct fitment on Mustang II-style front suspensions\u003c\/li\u003e\n\u003cli\u003eSingle adjustable valving with 18 settings for street, drag, or performance tuning\u003c\/li\u003e\n\u003cli\u003eLightweight billet aluminum shock body for reduced unsprung weight\u003c\/li\u003e\n\u003cli\u003eFully threaded body allows 0 to 2 inches of front ride height adjustment\u003c\/li\u003e\n\u003cli\u003e7.88 inch compressed length, 11 inch extended length for Mustang II geometry\u003c\/li\u003e\n\u003cli\u003eBolt-in installation at stock Mustang II mount locations, no welding required\u003c\/li\u003e\n\u003cli\u003e100% dyno tested and individually serialized at QA1's Minnesota facility\u003c\/li\u003e\n\u003cli\u003eServiceable and rebuildable by QA1 Authorized Service Centers\u003c\/li\u003e\n\u003cli\u003eMade in the USA\u003c\/li\u003e\n\u003cli\u003eLimited Lifetime Warranty from QA1\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eYear Range\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1974-1978\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003eMustang II\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1975-1980\u003c\/td\u003e\n\u003ctd\u003eFord\u003c\/td\u003e\n\u003ctd\u003ePinto\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003ctd\u003eVarious\u003c\/td\u003e\n\u003ctd\u003eCustom hot rods and street rods using Mustang II front clip\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eQAPMS303 \/ MS303\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePosition\u003c\/td\u003e\n\u003ctd\u003eFront\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShock Type\u003c\/td\u003e\n\u003ctd\u003ePro Coil, Billet Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eValving\u003c\/td\u003e\n\u003ctd\u003eSingle Adjustable, 18 settings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtended Length\u003c\/td\u003e\n\u003ctd\u003e11 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompressed Length\u003c\/td\u003e\n\u003ctd\u003e7.88 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLower Bushing\u003c\/td\u003e\n\u003ctd\u003e7\/16 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRide Height Adjustment\u003c\/td\u003e\n\u003ctd\u003e0 to 2 inches lowered\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody Material\u003c\/td\u003e\n\u003ctd\u003eBillet Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSprings Included\u003c\/td\u003e\n\u003ctd\u003eNo (shock only)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMade In\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLimited Lifetime\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003e806990096036\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1x QA1 MS303 Pro Front Coil-Over Shock Absorber (7\/16in bushing)\u003c\/li\u003e\n\u003cli\u003eInstallation hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eAbout QA1\u003c\/h4\u003e\n\u003cp\u003eQA1 is a Minnesota-based performance suspension manufacturer specializing in coil-over shocks, rod ends, and driveshafts for classic American vehicles and custom builds. The MS303 is part of their Mustang II-specific Pro Coil lineup, designed to make the popular Mustang II front suspension platform perform at the highest level. Every QA1 aluminum shock is 100% dyno tested, serialized, and designed to be rebuilt rather than replaced.\u003c\/p\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\n\u003cstrong\u003eWhat vehicles does the QAPMS303 fit?\u003c\/strong\u003e\n\u003cp\u003eThe QAPMS303 MS303 is designed for 1974-1978 Ford Mustang II front suspension applications. It is also widely used in custom hot rods, street rods, and kit cars that utilize Mustang II front clip geometry, which is one of the most popular front suspension swap packages in the custom car industry. The 7\/16 inch lower bushing interfaces directly with Mustang II-style lower spindle mounts.\u003c\/p\u003e\n\n\u003cstrong\u003eDoes the QAPMS303 come with springs?\u003c\/strong\u003e\n\u003cp\u003eNo. The QAPMS303 is the shock body only. QA1 Pro Coil springs must be purchased separately to complete the coil-over assembly. Spring rate selection depends on your front-end weight. Consult QA1's spring rate guide or their technical support team at QA1.net for the correct spring rate for your specific application.\u003c\/p\u003e\n\n\u003cstrong\u003eWhy is the Mustang II front suspension used in custom builds?\u003c\/strong\u003e\n\u003cp\u003eThe Mustang II front clip was designed in the early 1970s as a compact, lightweight IFS system with modern geometry compared to 1950s-1960s designs. Custom builders adopted it for pre-1965 cars, trucks, and rods because it offers rack-and-pinion steering, disc brakes, and geometry that can be adapted to almost any chassis with commercially available crossmembers and brackets. The QAPMS303 gives these builds proper adjustable coil-over performance.\u003c\/p\u003e\n\n\u003cstrong\u003eHow does the single adjustable valving work on the MS303?\u003c\/strong\u003e\n\u003cp\u003eThe MS303 features 18 simultaneous compression and rebound valving positions adjusted via the knob at the top of the shock body. Lower numbers give softer, more compliant damping for street cruising. Higher numbers firm up response for spirited driving or autocross. QA1 recommends starting in the middle range (position 9 of 18) and tuning from there based on road feel.\u003c\/p\u003e\n\n\u003cstrong\u003eWhat spring rate should I use with the QAPMS303?\u003c\/strong\u003e\n\u003cp\u003eSpring rate selection depends on front-end weight and intended use. Most Mustang II-based street car builds run 300 to 450 lb\/in front springs. High-performance and track-focused builds may run stiffer rates. QA1 offers their Pro Coil springs in multiple rates specifically sized for the MS303 shock travel dimensions. Contact QA1 technical support for a recommendation based on your build.\u003c\/p\u003e\n\n\u003cstrong\u003eIs the QAPMS303 rebuildable?\u003c\/strong\u003e\n\u003cp\u003eYes. Every QAPMS303 shock is individually serialized and designed to be serviced and revalved by QA1 Authorized Service Centers. This makes the QAPMS303 a long-term investment rather than a consumable part, which is especially valuable in custom builds where matching replacement shocks may be difficult to source years down the road.\u003c\/p\u003e\n\n\u003cstrong\u003eWhat is the ride height adjustment range on the MS303?\u003c\/strong\u003e\n\u003cp\u003eThe QAPMS303 provides 0 to 2 inches of front ride height adjustment via the fully threaded shock body. Turning the lower spring perch up or down on the threads changes the installed ride height. A spanner wrench (QA1 P\/N T114W or T115W) is required to make this adjustment.\u003c\/p\u003e\n\n\u003cstrong\u003eHow does the 7\/16 inch bushing on the QAPMS303 compare to other QA1 shocks?\u003c\/strong\u003e\n\u003cp\u003eThe 7\/16 inch lower bushing on the QAPMS303 is matched to the lower spindle bolt diameter used in Mustang II-style front suspension designs. Other QA1 Pro Coil shocks (such as those for GM applications) use different lower mount configurations. Always confirm your crossmember and spindle lower mount diameter before ordering to ensure proper fitment.\u003c\/p\u003e\n\n\u003cstrong\u003eWhat warranty does the QAPMS303 carry?\u003c\/strong\u003e\n\u003cp\u003eThe QAPMS303 is covered by QA1's Limited Lifetime Warranty for as long as the original purchaser owns the vehicle. Register your warranty at QA1.net\/Warranty after installation. The warranty covers defects in materials and workmanship under normal performance use conditions.\u003c\/p\u003e\n\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003col\u003e\n\u003cli\u003eVerify that your crossmember, spindles, and control arms are fully compatible with QA1 MS303 mount dimensions before starting\u003c\/li\u003e\n\u003cli\u003eSafely lift and support the vehicle, with front suspension hanging freely at full droop\u003c\/li\u003e\n\u003cli\u003eThread the spring perch collar to your desired ride height starting position before assembly\u003c\/li\u003e\n\u003cli\u003eSlide the QA1 Pro Coil spring onto the shock body and seat it on the lower perch\u003c\/li\u003e\n\u003cli\u003eInstall the QAPMS303 at the upper mount and lower 7\/16 inch bushing mount, torquing hardware to your crossmember manufacturer's specification\u003c\/li\u003e\n\u003cli\u003eSet final ride height using spanner wrench (QA1 P\/N T114W or T115W) with weight on the suspension\u003c\/li\u003e\n\u003cli\u003eStart valving at position 9 of 18 and test drive before adjusting further\u003c\/li\u003e\n\u003cli\u003eCheck and set alignment to your build's target caster, camber, and toe specifications after installation\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cp\u003e\u003cstrong\u003eWARNING:\u003c\/strong\u003e This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.\u003c\/p\u003e","brand":"QA1","offers":[{"title":"Default Title","offer_id":46022766985295,"sku":"QAPMS303","price":264.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/QA1_Mustang_II_Pro_Front_Coil-Over_Shock_7.88_11in.jpg?v=1783434866","url":"https:\/\/www.blackopsautoworks.com\/products\/qa1-qapms303-ms303-mustang-ii-pro-front-coil-over-shock","provider":"Black Ops Auto Works","version":"1.0","type":"link"}