QA1 R124-150S Four Link Kit w/ 9" Ford, 67-70 Mustang, Sng. 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.

SINGLE ADJUSTABLE COILOVERS

This system includes QA1’s single adjustable shocks, offering 18 clicks of rebound and compression adjustment together. A single knob 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
• Single 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: Single 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