MD401-10450C Front Pro Coil Shock System, Double Adjustable, Ford, 10in. Spring, 450lb./in.

MD401-10450C Front Pro Coil Shock System, Double Adjustable, Ford, 10in. Spring, 450lb./in.

QA1

SKU
MD401-10450C
$1,079.95
Estimated Shipping Date: Jun 25, 2026
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Installation Guide
California Prop 65
Emissions Code 4

Unlock maximum performance and adjustability for your classic Mustang with QA1’s Pro Coil System. Designed specifically for 1964–1966 Mustangs, this double adjustable coilover kit gives you total control over ride quality, stance, and handling. Featuring 10” coil springs with a 450 lb./in. spring rate, this setup is perfect for aggressive street performance and track-style handling.

COMPLETE TUNING CONTROL

QA1 double adjustable shocks provide independent rebound and compression adjustment, with 18 clicks each. This lets you precisely tune how your Mustang responds to bumps, body roll, and cornering forces. Whether you’re dialing in settings for cruising, carving corners, or competition driving, you’ll have full suspension control at your fingertips.

CUSTOMIZABLE RIDE HEIGHT

Achieve the stance you want with ride height adjustment from factory stock height down to 2” lower. Perfect for lowering your Mustang for a more aggressive look or fine-tuning ride height to match wheels, tires, or handling preferences.

EASY BOLT-IN INSTALLATION

No cutting. No welding. The QA1 Pro Coil System bolts directly into place, making it a straightforward upgrade that delivers modern suspension performance without fabrication.

FEATURES & BENEFITS

  • Application-specific fit for 1964–1966 Ford Mustangs
  • Double adjustable shocks with 18 clicks each for rebound and compression
  • Includes 10” coil springs with a 450 lb./in. spring rate
  • Ride height adjustable: factory to –2”
  • Direct bolt-in installation - no welding required
  • Premium powder-coated springs and durable hardware
  • Works seamlessly with QA1 tubular control arms and sway bars

FITMENT NOTES

  • Fits 1964–1966 Ford Mustangs
  • Ride height adjustable: factory to –2”
  • Includes double adjustable shocks and 10” 450 lb./in. springs
  • Works with factory control arms or QA1 tubular control arms and sway bars
  • Bolt-in installation - no welding required

RECOMMENDED FRONT SPRING RATE CHART

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

Specifications

  • Spring Rate450lb/in.
  • Springs IncludedYes
  • Shock ValvingDouble Adjustable
  • Vehicle PositionFront

FREQUENTLY ASKED QUESTIONS (FAQ’s)

What spring rate comes with the QA1 MD401-10450C coilover kit?

This kit includes 10” front coil springs with a 450 lb./in. spring rate, offering the firmest option in QA1’s lineup for sharper handling and reduced body movement.

What is the advantage of double adjustable QA1 coilovers?

Double adjustable shocks let you control rebound and compression independently, allowing precise suspension tuning for comfort, performance, or track conditions.

How much ride height adjustment do QA1 Pro Coils provide?

Ride height can be adjusted from factory stock height down to 2 inches lower, letting you set the ideal stance while maintaining geometry.

Do these coilovers require modifications to install?

No. QA1 Pro Coil Systems are designed for bolt-in installation with basic tools - no welding or cutting needed.

Is the 450 lb./in. spring rate too stiff for street use?

The 450 lb./in. spring is firmer than the 350 or 400 lb./in. options, making it best for aggressive street driving or cars that see occasional track use. Thanks to the double adjustable shocks, you can still dial in softer settings for cruising.

Can QA1 Pro Coils be used with other suspension upgrades?

Yes. For maximum results, pair coilovers with QA1 tubular control arms and sway bars to create a complete suspension package.

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