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. 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.
- Application-specific fit for 1967–1970 Ford Mustangs
- Includes drain plug, fill plug, vent port, and jack pad for easy serviceability
- Weld-in installation with self-fixturing brackets for perfect geometry
- 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
Attributes:
- Brand Name: QA1
- GTIN: 00806990234667
- Air Adjustable: No
- Bushing Color: Black
- Bushing Material: Polyurethane
- Coil Spring Color: Silver
- Coil Spring Compressed Length: 8
- Coil Spring Insulator(s) Included: No
- Coil Spring Material: Chrome Silicon Alloy
- Coil Spring Relaxed Length: 12
- Grade Type: Performance
- Manufacturer Part Number: R124-150S
- Rear Shocks Compressed Length: 11.13
- Rear Shocks Relaxed Length: 16.38
- Strut Mount Insulator(s) Included: No
- Suspension Type: Spring
- UPC: 806990234667
Extended Information:
- Country of Origin: United States
- Emissions : Emissions Compliance Exempt
- Life Cycle Status: Available To Order
Packing Information:
- Quantity of Each: 1
- Package UOM: EA
- Dimension: 9.5 x 63 x 8 inches
- Weight: 75 POUNDS