# QA1 64-66 Ford Mustang Rear Suspension Conversion System - Single Adj. 130lb/in

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 18-click, single adjustable shocks allow you to fine-tune ride quality and handling, giving your Mustang a balance of comfort and performance. 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.

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

This Part Fits:

Year

Make

Model

Submodel

1964-1966

Ford

Mustang

Base

1965-1966

Ford

Mustang

Shelby GT-350

1966

Ford

Mustang

Shelby GT-350H

## Details

- **Price:** 3327.18 CAD
- **Vendor:** QA1
- **Type:** Suspension Packages

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 3327.18 CAD | In stock |

## Images

- Photo - Primary
- Photo - Close Up
- Photo - Close Up
- Photo - out of package
- Photo - out of package
- Logo Image

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/qa1-64-66-ford-mustang-rear-suspension-conversion-system-single-adj-130lb-in)
> Updated: 2026-06-27