MD402-10400C Front Pro Coil Shock System, Double Adjustable, Ford, 10in. Spring, 400lb./in.

MD402-10400C Front Pro Coil Shock System, Double Adjustable, Ford, 10in. Spring, 400lb./in.

QA1

SKU
MD402-10400C
$1,079.95
Estimated Shipping Date: Jun 10, 2026
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Installation Guide
California Prop 65
Emissions Code 4

Bring modern suspension technology to your classic Mustang with QA1’s Front Pro Coil System. Designed for 1967–1973 Mustangs, this double adjustable coilover kit delivers unmatched handling, ride quality, and stance control. Featuring 10” coil springs with a 400 lb./in. rate, it provides the ideal balance for performance street cars and restomod builds, giving you precision tuning for both comfort and control.

PRECISION HANDLING & ADJUSTABILITY

QA1’s double adjustable coilovers feature independent rebound and compression controls with 18 clicks each. This allows you to fine-tune your Mustang’s ride and handling for daily driving, spirited cruising, or track use - giving you total control over how your car feels on the road.

RIDE HEIGHT FLEXIBILITY

Dial in your stance with ride height adjustability from factory stock height down to 2” lower. Perfect for achieving the aggressive look you want while maintaining suspension geometry and drivability.

EASY BOLT-IN INSTALLATION

No welding or cutting is required. The QA1 Pro Coil System is engineered as a direct bolt-in upgrade, making installation simple with basic tools while delivering professional-level results.

FEATURES & BENEFITS

  • Application-specific fit for 1967–1973 Ford Mustangs
  • Double adjustable shocks with 18 rebound and 18 compression settings
  • Includes 10” coil springs with a 400 lb./in. spring rate
  • Ride height adjustable: factory to –2”
  • Easy bolt-in installation - no welding required
  • Premium hardware and powder-coated springs for durability
  • Works seamlessly with QA1 tubular control arms and sway bars

FITMENT NOTES

  • Fits 1967–1973 Ford Mustangs
  • Ride height adjustable: factory to –2”
  • Includes double adjustable shocks and 10” 400 lb./in. springs
  • Works with factory control arms or QA1 tubular control arms and sway bars (available for 67-70 Mustangs only)
  • Bolt-in installation — no welding required
  • Sold as a pair

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 Rate400lb/in.
  • Springs IncludedYes
  • Shock ValvingDouble Adjustable
  • Vehicle PositionFront

FREQUENTLY ASKED QUESTIONS (FAQ’s)

What spring rate comes with the QA1 MD402-10400C kit?

This system includes 10” front coil springs with a 400 lb./in. spring rate, a balanced option for sharper handling and comfortable street performance.

What’s the advantage of double adjustable shocks?

Double adjustable shocks provide independent rebound and compression control with 18 clicks each, giving you greater flexibility to dial in handling and comfort compared to single adjustable shocks.

How much ride height adjustment do these coilovers allow?

Ride height can be adjusted from factory stock height down to 2 inches lower, giving you stance and handling flexibility.

Do I need to weld or cut anything to install QA1 coilovers?

No. The kit is engineered as a direct bolt-in upgrade and installs with standard tools.

Are QA1 double adjustable coilovers good for street driving?

Yes. They’re designed for both street performance and track use, giving you comfort for cruising and the adjustability needed for serious cornering.

What other suspension parts should I upgrade with QA1 Pro Coils?

For maximum handling improvement, pair them with QA1 tubular control arms and sway bars. (available for 67-70 Mustangs only)

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