QA1 R224-150S Four Link Kit w/ 9" Ford, 67-70 Mustang, Dbl. Adj.

Transform your 1967–1970 Mustang’s rear suspension with QA1’s complete bolt-in 4-link system, featuring a custom QA1 9-inch rear housing. This all-inclusive kit delivers modern handling, improved traction, and the durability to handle serious horsepower - all while retaining a clean, factory-style fit. Perfect for restomod builds and performance street cars, this setup eliminates the compromises of leaf-spring suspension for good.

MODERN HANDLING FOR YOUR CLASSIC MUSTANG

QA1’s triangulated 4-link system replaces leaf springs with a geometry-optimized setup that improves traction, stability, and ride quality. By eliminating axle wrap and keeping pinion angle consistent under load, your Mustang will launch harder, corner flatter, and drive smoother - whether you’re cruising or carving corners.

DOUBLE ADJUSTABLE COILOVERS

This system includes QA1’s double adjustable shocks, offering 18 clicks of rebound and compression adjustment together. Two knobs makes it easy to fine-tune comfort and performance, giving you complete control over how your Mustang rides and handles.

BUILT TO HANDLE BIG POWER

QA1’s fabricated 9-inch housing is designed to take abuse. Fully formed trailing arm brackets minimize flex, while 3” OD, ¼” wall axle tubes and 31-spline alloy axles provide the strength to handle up to 650 HP (housing rated to 800 HP). The result is a rigid, predictable suspension that’s ready for modern horsepower levels.

RIDE HEIGHT ADJUSTABILITY

Easily adjust ride height from factory level to 3” lower. Fine-tune your stance and handling without compromising geometry, tire clearance, or comfort - all with simple, tool-free adjusters.

FEATURES & BENEFITS

• Application-specific fit for 1967–1970 Ford Mustangs
• Complete system includes 9” rear housing, triangulated 4-link, and coilover shocks
• Double adjustable shocks with 18 clicks of rebound/compression control
• Adjustable ride height: factory to –3”
• Eliminates axle wrap and wheel hop for improved traction and control
• Heavy-duty fabricated 9” housing with 3” OD, ¼” wall axle tubes
• 31-spline 1541H alloy axles rated to 650 HP (housing rated to 800 HP)
• Big Ford “New Style Torino” flanges (2.5” offset) for easy brake compatibility
• 5x4.5” bolt pattern fits most aftermarket Mustang wheels
• Includes drain plug, fill plug, vent port, and jack pad for easy serviceability
• Weld-in installation with self-fixturing brackets for perfect geometry alignment
• Made in the USA with premium materials and hardware

EASY INSTALLATION

The QA1 4-link kit is designed for self-fixturing weld-in installation, ensuring accurate alignment with minimal fabrication. The included QA1 9” housing bolts in cleanly, providing a precise fit with QA1’s brackets and coilovers.

SPECIFICATIONS

• Vehicle Position: Rear
• Shock Valving: Double Adjustable
• Springs Included: Yes
• Spring Rate: 150lb/in.
• Axle Shaft Splines: 31
• Width (Wheel mounting surfaces): 59 3/8in
• Brake Flange: Big Ford "New Style Torino"
• Brake Offset: 2.5"
• Bolt Pattern: 5x4.5 in