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

Transform the way your early Mustang handles with QA1’s rear four-link kit. Designed for 1964–1966 Mustangs, this double 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, double 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.

FEATURES & BENEFITS

• Fits 1964–1966 Ford Mustangs
• Double adjustable shocks for fine-tuning ride and handling
• 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

Specifications

• Vehicle Position: Rear
• Shock Valving: Double Adjustable
• Springs Included: Yes
• Spring Rate: 130lb/in.