QA1 R223-130 Four Link Kit, 64-66 Mustang, Double Adjustable

QA1 R223-130 Four Link Kit, 64-66 Mustang, Double Adjustable

QA1

SKU
R223-130
$2,597.95
Estimated Shipping Date: Jul 15, 2026
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Installation Guide
California Prop 65
Emissions Code 4

Transform the way your early Mustang handles with QA1’s rear four-link kit. Designed for 1964–1966 Mustangs, this single adjustable four-link replaces the factory leaf springs with a modern suspension system that delivers improved traction, adjustability, and ride quality. Whether you’re building a street machine or a track-capable restomod, QA1’s four-link gives you the control and confidence you need.

MODERN HANDLING FOR YOUR CLASSIC MUSTANG

Factory leaf springs were never designed for today’s performance expectations. QA1’s four-link suspension eliminates axle wrap, controls wheel hop, and keeps the tires planted under hard acceleration and cornering. The double adjustable shocks allow you to fine-tune performance and handling, giving your Mustang a balance of comfort and control.

RIDE HEIGHT & ADJUSTABILITY

This kit offers a ride height adjustment range from the stock ride height to 3” lower than factory. That means you can dial in the perfect stance for your build, whether you’re looking for a lowered, aggressive look or stock-like ride height with modern performance benefits.

WELD-IN INSTALLATION

For maximum strength and durability, this kit requires welding during installation. QA1 engineered the brackets to be self-fixturing, making the process as straightforward as possible. Once installed, the system integrates seamlessly into your Mustang chassis.

FEATURES & BENEFITS

  • Fits 1964–1966 Ford Mustangs
  • Double adjustable shocks for outstanding performance
  • Eliminates axle wrap and wheel hop
  • Provides predictable traction and stability
  • Ride height adjustability: 3” of adjustment
  • Works with factory axle housings or QA1 9” housings
  • Self-fixturing weld-in brackets for easier installation
  • Polyurethane bushings reduce noise while maintaining strength
  • Powder-coated components for durability
  • Complete kit includes shocks, brackets, hardware, and links

FITMENT NOTES

  • Fits 1964–1966 Ford Mustangs
  • Designed for use with factory or QA1 9” rear housings
  • Welding required for installation
  • Double adjustable shocks included

Specifications

  • Vehicle PositionRear
  • Shock ValvingDouble Adjustable
  • Springs IncludedYes
  • Spring Rate130lb/in.

FREQUENTLY ASKED QUESTIONS (FAQ’s)

What makes a four-link better than leaf springs on a classic Mustang?

A four-link eliminates axle wrap and wheel hop, keeping the tires planted under acceleration and cornering. This results in more consistent traction, improved stability, and modern handling performance.

Does the QA1 four-link kit require welding?

Yes. To ensure maximum strength, the included brackets must be welded to the chassis. The kit uses self-fixturing brackets to simplify installation.

What is the ride height range of this kit?

The QA1 R223-130 kit offers 3” of ride height adjustability, allowing you to fine-tune stance and suspension geometry.

Can I use this kit with my factory axle housing?

Yes. The kit is designed to work with either factory axle housings or QA1’s 9” housings.

What suspension parts pair well with this four-link?

QA1 recommends pairing the four-link with tubular control arms, QA1 Pro Coil coilovers, and sway bars for a fully modern suspension system.

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