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QA1 Kit, Pro-Coil Aluminum D-Adj, 10-450 Tapered Flat Lrg MD402-10450C

QA1 Kit, Pro-Coil Aluminum D-Adj, 10-450 Tapered Flat Lrg MD402-10450C
$1,726.99 ea
NEWARRIVING SOONEstimated Ship Date 08/25/2025 (If Ordered Today)
Model: 5056654
Select a Vehicle or refer to the Vehicle Fitment Tab below to verify that this part fits your vehicle.
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QA1 Double Adjustable Pro-Coil kits are an excellent choice for any Classic Mustang owner looking for a better stance, ride quality and performance. These easy-to-install bolt-in kits are a great solution for adjustable ride height, and the double adjustable valving provides ample range of tunability from the street to the track.  

QA1 coil over benefits: easily adjust your stance, performance, and comfort; USA-made quality

DIAL IN THE PERFECT STANCE 

Achieving the perfect, level stance is critical for the overall look and appearance of your car. Mustang Pro-Coil kits offer 0 to –2 inches of ride height adjustability. Adjustments within this range can be made with a simple turn of the spring seat nut. For an additional drop beyond 2 inches, consider adding drop spindles to your car. 

TUNE YOUR RIDE COMFORT & PERFORMANCE

Double-adjustable coilovers are ideal for drivers looking for great performance on the street or track. Independent tuning of compression and rebound allows you to fine-tune the handling or straight-line performance of your vehicle for any driving condition. Accessing the 18-position knob is easy, and by turning the steering wheel to full lock, you can reach in and make your tuning adjustments at the base of the shock.  

QA1 Pro-Coil kits feature high-travel, USA-made coil springs built to deliver optimal performance. Spring rates are tailored to your vehicle's weight and driving style. Need help choosing the correct spring rate? Watch this video

EASY, BOLT-IN INSTALLATION

Mustang Pro-Coil Kits seamlessly bolt-in with Original Equipment (OE) control arms.

MADE IN THE USA

QA1 shocks are proudly made in Lakeville, Minnesota. See a complete video on the manufacturing process. 

FEATURES AND BENEFITS

  • Up to 2” of ride height adjustment allows you to dial in the perfect stance. 
  • Achieve the ultimate balance of ride quality and performance with with independent tuning of rebound and compression valving. 
  • Limited Lifetime Warranty for peace of mind. 
  • Proudly made in the USA

BEST-IN-CLASS WARRANTY

QA1 Single Adjustable Pro-Coil Kits are eligible for a Limited Lifetime Warranty. For peace of mind, simply register your shocks at QA1.net/Warranty to ensure coverage for as long as you own your vehicle. 

FITMENT NOTES

Spanner wrench: P/N T114W or T115W (required) Thrust Bearing Kits (optional): P/N 7888-109 

RECOMMENDED FRONT SPRING RATE CHART

YEAR MODEL SMALL BLOCK SPRINGS BIG BLOCK SPRINGS
1964-1966 Mustang 350 450
1967-1973 Mustang 400 500
About Qa1 Precision Products

From bolt-on products that get you behind the wheel faster, to experienced technicians available to help increase your 60’ times or handle curves with confidence, everything we do is designed to get you out on the road.

Whether your goal is a Saturday night sprint across the checkered flag or a slow, easy cruise down main street, we have the suspension and driveline products you need for the experience you want.

No matter what you drive, we want you to #goDRIVEit!

Downloads:

Download Name File Size
9919-255_REV_12-12-19_64-73 Mustang Pro Coil.pdf903.41KB

Vehicle Fitment:

The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make Model Years
Ford Mustang 1964 - 1973

Specifications:

Part Type Shock Absorber and Coil Spring Assembly
Proposition 65 www.P65Warnings.ca.gov
Warranty Time 1 YR

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QA1 Kit, Pro-Coil Aluminum D-Adj, 10-450 Tapered Flat Lrg MD402-10450C: