MS401-10450C Front Pro Coil Shock System, Single Adjustable, Ford, 10in. Spring, 450lb./in.

MS401-10450C Front Pro Coil Shock System, Single Adjustable, Ford, 10in. Spring, 450lb./in.

QA1

SKU
MS401-10450C
$854.95
Estimated Shipping Date: Jun 25, 2026
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Installation Guide
California Prop 65
Emissions Code 4

Transform your classic Mustang’s suspension with QA1’s Pro Coil System. Designed for 1964–1966 Mustangs, this single adjustable coilover kit offers modern ride quality, handling, and stance adjustability in an easy bolt-in package. Featuring a 10” coil spring with a 450 lb./in. rate, this system is ideal for drivers who want a firmer ride and enhanced cornering performance without going to a full track setup.

MODERN HANDLING & CONTROL

Stock suspensions were never built for today’s performance demands. With QA1’s single adjustable coilovers, you can fine-tune rebound and compression together across 18 settings. A single adjustment knob makes it easy to soften the ride for the street or firm it up for more spirited driving.

RIDE HEIGHT FLEXIBILITY

Get the stance you want without sacrificing drivability. This system allows you to adjust ride height from factory stock height down to 2” lower, perfect for dialing in wheel/tire fitment or achieving a more aggressive look.

EASY BOLT-IN INSTALLATION

No welding or cutting required. QA1 Pro Coils are designed as direct bolt-in replacements for factory, or QA1 tubular components, making them one of the easiest suspension upgrades you can install at home.

FEATURES & BENEFITS

  • Application-specific fit for 1964–1966 Ford Mustangs
  • Single adjustable shocks with 18 rebound/compression settings
  • Includes 10” coil springs with a 450 lb./in. spring rate
  • Adjustable ride height: factory to –2”
  • Direct bolt-in installation - no welding required
  • Powder-coated springs and premium hardware for durability
  • Complements QA1 tubular control arms and sway bars for a full suspension upgrade

FITMENT NOTES

  • Fits 1964–1966 Ford Mustangs
  • Ride height adjustable: factory to –2”
  • Includes single adjustable shocks and 10” 450 lb./in. springs
  • Works with 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 ValvingSingle Adjustable
  • Vehicle PositionFront

FREQUENTLY ASKED QUESTIONS (FAQ’s)

What spring rate comes with the QA1 MS401-10450C coilover kit?

This kit includes 10” front coil springs with a 450 lb./in. spring rate, designed for firmer handling and sharper cornering response.

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

The system allows ride height adjustment from factory stock height down to 2 inches lower, giving you full stance and fitment control.

How do single adjustable QA1 coilovers work?

Single adjustable shocks use one knob to control rebound and compression together, offering 18 settings to fine-tune comfort and performance.

Do QA1 coilover kits require modifications?

No. The MS401-10450C system is designed for direct bolt-in installation with basic tools - no cutting or welding required.

What’s the difference between 350, 400, and 450 lb./in. QA1 springs?

The 350 lb./in. spring is the softest for comfort, the 400 lb./in. is a balanced street performance option, and the 450 lb./in. spring offers the firmest feel with sharper handling response for aggressive street driving or light competition.

Are QA1 single adjustable coilovers good for daily driving?

Yes. While the 450 lb./in. springs are firmer, the 18-position adjustment knob lets you soften the ride for cruising and stiffen it when performance matters.

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