67-70 Mustang QA1 9 Inch Rear Housing for QA1 4-Link

Built to Maximize Your QA1 4-Link Performance

This QA1 9” housing is purpose-built to integrate seamlessly with QA1 Mustang 4-Link suspension kits. Fully formed trailing arm brackets are welded directly to the housing to reduce deflection under load, keeping suspension geometry consistent during hard acceleration and aggressive driving.

Whether you’re increasing horsepower or simply want long-term reliability, this housing delivers a noticeable improvement in traction, responsiveness, and driveline durability—all while maintaining factory wheel fitment.

Features & Performance Benefits

• Fabricated steel center section engineered for exceptional strength and rigidity

• Fully formed trailing arm brackets minimize flex and improve suspension control

• Heavy-duty 3” OD axle tubes with ¼” wall thickness for high-performance use

• 31-spline 1541H alloy axles rated for up to 650 horsepower

• Housing strength rated up to 800 horsepower

• Big Ford “New Style Torino” brake flanges with 2.5” axle offset for broad brake compatibility

• Standard 5x4.5” Ford bolt pattern fits most classic and modern wheels

• Factory wheel mounting surface width for correct tire clearance

  • 1967–1970 Mustang: 59 3/8” Track width (Brake Rotor Hub to Brake Rotor Hub)

• ½” x 3” wheel studs ideal for aftermarket alloy wheels

• Integrated fill plug, drain plug, vent port, and jack pad for simplified maintenance

• Semi-gloss black powder coat finish resists corrosion and enhances appearance

• Includes T-bolts, housing studs, and roller bearings for smooth, reliable operation

Straightforward Installation & Easy Serviceability

This QA1 rear housing is designed for true bolt-on installation when used with QA1 4-Link suspension systems. No cutting, welding, or fabrication is required.

Serviceability is also a major advantage. The built-in jack pad, along with dedicated fill and drain plugs, makes fluid changes clean and convenient—perfect for street-driven Mustangs and high-performance builds alike.

If your Mustang already has a QA1 4-Link installed, this housing bolts directly in place for a clean, hassle-free upgrade.

Key Specifications

• Vehicle Fitment: 1967–1970 Ford Mustang (QA1 4-Link equipped)

• Wheel Mounting Surface Width (track width): 59 3/8” (hub face to hub face)

• Axle Splines: 31

• Axle Tube Diameter: 3” OD, ¼” wall

• Brake Flange: Big Ford “New Style Torino”

• Brake Offset: 2.5”

• Bolt Pattern: 5 x 4.5”

• Wheel Studs: ½” x 3”

• Hub Diameter: 2.770”

Fitment Notes & Important Information

• Designed exclusively for QA1 4-Link suspension systems

• Third member (center section) sold separately

• Stock-width housing recommended for vehicles with factory wheel tubs

• Always verify wheel and tire fitment before installation

Why Choose QA1 Rear Housings from Stang-Aholics?

At Stang-Aholics, we focus on performance parts that actually improve how your classic Mustang drives. This QA1 fabricated 9” rear housing is the ideal solution for enthusiasts who demand strength, precision, and reliability—without compromising fitment or serviceability.

If you’re pushing your Mustang beyond stock power levels, this rear housing ensures your drivetrain is ready to handle it.