Product Summary

03-11 Ford Crown Victoria, Front Position, Anodized

  • These QA1 Crown Victoria Pro Coil Systems are a great option for anyone looking for fully adjustable ride height and valving control
  • Choose a spring rate and adjustability that fits your driving style (sold as separate part numbers), adjust the valving to match, and you are on your way
  • These shocks also utilize a fully threaded body that allows you to adjust your ride height for the perfect stance or to finely tune the weight balance for superior handling
  • Specially designed for QA1's Pro Coil Systems, the American-made lightweight high travel springs have fewer coils and a smaller wire diameter, resulting in increased travel due to the larger distance between the coils
  • They reduce unsprung weight and react faster, optimizing suspension performance

Key Specs

MFG. Part #MD431-09550
Spring Rate550 lbs.
Shock AdjustabilityDouble Adjustable

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QA1 specializes in providing performance shocks, suspension components, carbon fiber driveshafts, rod ends, ball joints and more to a variety of automotive markets, including circle track racing, drag racing, street performance, and street rodding. With over 83,000 square feet of manufacturing space in Lakeville, MN, QA1 is proud to offer an extensive line of American-made suspension and driveline. Founded in 1993 by Jim Jordan, QA1 introduced rod ends and spherical bearings specifically for the performance racing industry, quickly becoming the #1 name in rod ends, spherical bearings, custom linkages and similar products to the motorsports industry. Always on the cutting edge of technology, QA1 recently introduced in-house filament winding of carbon fiber and similar materials to provide driveshafts and other products. With continued focus on fine-tuning and expanding its offering of American-made high performance suspension components and carbon fiber driveshafts, QA1 has grown to be a household name in the performance aftermarket.

  • Front Pro Coil double adjustable stock mount shock kit
  • Includes 9" spring with rating of 550 and a flat end.



MFG. Part #MD431-09550
Spring Rate550 lbs.
Shock AdjustabilityDouble Adjustable
Shock TypeTwin Tube
Shock Body MaterialAluminum
Upper Shock MountBracket
Lower Shock MountBushed Eyelet
Height AdjustableYes
Spring Length9 Inch
Mount PositionBody-Up
Number of Valving Selections324
Coilover Kit IncludedYes
Coilover Springs IncludedYes
Sold in QuantityKit
Hardware IncludedYes
Crossmember IncludedNo
Welding RequiredNo
Mounting Bracket IncludedYes
Spring FinishPowder Coated
Spring ColorBlack
GTIN Code806990159953