MS402-10500C Front Pro Coil Shock System, Single Adjustable, Ford, 10in. Spring, 500lb./in.

MS402-10500C Front Pro Coil Shock System, Single Adjustable, Ford, 10in. Spring, 500lb./in.

QA1

SKU
MS402-10500C
$854.95
Estimated Shipping Date: Jun 10, 2026
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Installation Guide
California Prop 65
Emissions Code 4

Upgrade your 1967–1973 Mustang with QA1’s Pro Coil System for modern performance and stance adjustability. This single adjustable coilover kit delivers sharper handling, ride quality, and durability in a direct bolt-in package. Featuring 10” coil springs with a 500 lb./in. rate, this system is specifically tailored for the heavier weight of ‘67-‘73 Mustangs with big block engines, giving you the right balance of support, comfort, and control.

MODERN HANDLING & ADJUSTABILITY

QA1’s single adjustable coilovers provide 18 settings of rebound and compression control combined in one knob. Easily dial softer settings for cruising or firmer settings for aggressive cornering, letting you tune your Mustang for any driving style.

RIDE HEIGHT FLEXIBILITY

Adjust ride height from factory stock height down to 2” lower. Whether you want to preserve a factory stance, achieve a more aggressive look, or fine-tune for wheel/tire fitment, QA1 Pro Coils let you make changes without compromising suspension geometry.

EASY BOLT-IN INSTALLATION

Direct-fit design means no cutting or welding required. QA1’s Pro Coil System bolts in with standard tools, making it one of the most straightforward suspension upgrades available for your classic Mustang.

FEATURES & BENEFITS

  • Application-specific fit for 1967–1973 Ford Mustangs
  • Single adjustable shocks with 18 combined rebound/compression settings
  • Includes 10” coil springs with a 500 lb./in. spring rate tailored to heavier ’67–’73 Mustangs
  • Ride height adjustable: factory to –2”
  • Easy bolt-in installation - no welding required
  • Durable powder-coated springs and premium hardware
  • Complements QA1 tubular control arms and sway bars for a full suspension solution

FITMENT NOTES

  • Fits 1967–1973 Ford Mustangs
  • Ride height adjustable: factory to –2”
  • Includes single adjustable shocks and 10” 500 lb./in. springs
  • Springs are tailored to the heavier weight of ’67–’73 Mustangs
  • Works with factory control arms or QA1 tubular control arms and sway bars (available for 67-70 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 Rate500lb/in.
  • Springs IncludedYes
  • Shock ValvingSingle Adjustable
  • Vehicle PositionFront

FREQUENTLY ASKED QUESTIONS (FAQ’s)

What spring rate comes with the QA1 MS402-10500C coilover kit?

This kit includes 10” front coil springs with a 500 lb./in. spring rate, designed to match the heavier weight of 1967–1973 Mustangs with big block engines.

Is a 500 lb./in. spring rate too stiff for the street?

No. While 500 lb./in. springs are firmer than 400, or 450 lb./in. options, they are tailored for the heavier ’67-‘73 Mustangs with big block engines. This ensures proper balance and handling while still being street-friendly.

How much ride height adjustment do QA1 Pro Coils provide?

Ride height is adjustable from factory stock height down to 2 inches lower, giving flexibility for stance, geometry, and wheel/tire fitment.

How do QA1 single adjustable coilovers work?

A single adjustment knob controls rebound and compression together, with 18 settings to fine-tune ride comfort and performance.

Do QA1 coilover kits require modifications to install?

No. They’re designed as direct bolt-in upgrades for classic Mustangs - no cutting or welding required.

What other suspension upgrades work best with QA1 Pro Coils?

Pair coilovers with QA1 tubular control arms and sway bars to improve geometry, strength, and cornering stability. (available for 67-70 Mustangs only)

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