MD401-10400C Front Pro Coil Shock System, Double Adjustable, Ford, 10in. Spring, 400lb./in.

MD401-10400C Front Pro Coil Shock System, Double Adjustable, Ford, 10in. Spring, 400lb./in.

QA1

SKU
MD401-10400C
$1,079.95
Estimated Shipping Date: Jun 12, 2026
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Installation Guide
California Prop 65
Emissions Code 4

Bring modern suspension performance to your classic Mustang with QA1’s Pro Coil System. Specifically designed for 1964–1966 Mustangs, this double adjustable coilover kit delivers full control over ride quality, stance, and handling. With 10” coil springs rated at 400 lb./in., this setup strikes the ideal balance between ride comfort and sharper performance for aggressive street driving or entry-level competition builds.

FULL CONTROL WITH DOUBLE ADJUSTABILITY

QA1’s double adjustable shocks feature independent rebound and compression control with 18 clicks each. This allows you to fine-tune how your Mustang handles bumps, weight transfer, and cornering grip. Whether you’re cruising, carving backroads, or setting up for a track day, this system puts you in complete control.

RIDE HEIGHT FLEXIBILITY

Easily dial in the perfect stance with ride height adjustment from factory stock height down to 2” lower. Lower your Mustang for an aggressive look, improve handling balance, or fine-tune for wheel and tire clearance without sacrificing geometry.

EASY BOLT-IN INSTALLATION

No welding, no cutting. The Pro Coil System installs with basic hand tools as a direct bolt-in upgrade, making it an accessible DIY-friendly solution for classic Mustang owners.

FEATURES & BENEFITS

  • Application-specific fit for 1964–1966 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”
  • Direct bolt-in installation - no welding required
  • Premium powder-coated springs and high-quality hardware for long-lasting durability
  • Pairs perfectly with QA1 tubular control arms and sway bars for a complete suspension system

FITMENT NOTES

  • Fits 1964–1966 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
  • 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 Rate400lb/in.
  • Springs IncludedYes
  • Shock ValvingDouble Adjustable
  • Vehicle PositionFront

FREQUENTLY ASKED QUESTIONS (FAQ’s)

What spring rate comes with the QA1 MD401-10400C coilover kit?

This system includes 10” front coil springs with a 400 lb./in. spring rate, offering a firmer ride than 350 lb./in. springs while still being comfortable for street use.

What is the benefit of double adjustable coilovers compared to single adjustable?

Double adjustable shocks provide independent rebound and compression control, giving you more precise tuning for handling, comfort, and performance. Single adjustable shocks adjust both together with one knob.

How much ride height adjustment do QA1 Pro Coils provide on a 1964–1966 Mustang?

They allow ride height adjustment from factory stock height down to 2 inches lower, making it easy to fine-tune stance and handling.

Do QA1 double adjustable coilovers require modifications to install?

No. They’re designed for direct bolt-in installation with standard tools - no cutting or welding required.

Is the 400 lb./in. spring rate good for daily driving?

Yes. The 400 lb./in. spring offers a firmer, more responsive feel than 350 lb./in. springs while still being very street-friendly, making it a popular choice for drivers who want sharper handling without a harsh ride.

Can this QA1 Pro Coil kit be combined with other suspension upgrades?

Yes. For maximum performance, pair coilovers with QA1 tubular control arms and sway bars, which further improve geometry, strength, and cornering ability.

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