Already running one of QA1’s 4-Link Suspension Kits on your 1967–1970 Mustang? Upgrade your build with QA1’s fabricated 9” rear housing — engineered for seamless integration, improved strength, and simplified serviceability. This housing is purpose-built to withstand modern horsepower levels while maintaining precise suspension geometry and a clean, bolt-on installation.
ENHANCE YOUR EXISTING QA1 4-LINK
QA1’s 9” rear housing is designed to bolt directly to QA1 4-link systems, eliminating the need for custom fabrication. It features fully formed trailing arm brackets that reduce flex under hard acceleration and cornering, ensuring your suspension performs consistently under load. Whether you’re upgrading your street car or finishing a restomod project, this housing provides the perfect combination of strength, alignment precision, and OEM-level fit.
FEATURES & BENEFITS
- Fabricated steel center section engineered for maximum rigidity and long-term durability
- Fully formed trailing arm brackets reduce flex for consistent suspension geometry
- Heavy-duty 3” OD, ¼” wall axle tubes for high-performance street and strip builds
- 31-spline 1541H alloy axles rated for up to 650 HP; housing rated to 800 HP
- Big Ford “New Style Torino” flanges (2.5” axle offset) for wide brake compatibility
- Standard 5x4.5” bolt pattern fits popular Ford wheel options
- Integrated drain plug, fill plug, vent port, and jack pad for simplified servicing
- ½” x 3” wheel studs for secure wheel fitment
- Factory wheel mounting surface width for proper tire clearance – 1967–1970: 59 3/8”
- Durable semi-gloss powder coat finish resists corrosion and looks great
- Includes T-bolts, housing studs, and roller bearings for smooth, quiet operation
EASY INSTALLATION & SERVICEABILITY
QA1’s bolt-in design means no cutting or welding is required. Every detail - from the formed brackets to the integrated jack pad and fill/drain ports - is built to simplify installation and maintenance. If your Mustang already runs a QA1 4-link system, this housing bolts directly in for a precise, trouble-free upgrade.
HELPFUL SPECIFICATIONS
- Fits QA1 4-Link kits for 1967–1970 Ford Mustangs
- Factory wheel mounting surface: 59 3/8”
- Big Ford “New Style Torino” flanges with 2.5” axle offset
- 5x4.5” bolt pattern (standard Ford fitment)
- ½” x 3” wheel studs
- 2.770” hub diameter
- Requires third member for Ford 9” housings with 31-spline axles
FITMENT NOTES
- For use with QA1 4-link suspension systems only
- Center section (third member) sold separately
- Stock width housing recommended for use with stock wheel tubs
- Verify wheel and tire fitment on vehicle before installation
- Wheel studs are 1/2in-20 thread with 0.615in knurl
Specifications
- Axle Shaft Splines31
- Width at wheel mount surfaces59 3/8in
- Brake FlangeBig Ford "New Style Torino"
- Brake Offset2.5"
- Bolt Pattern5x4.5 in
