QA1 Launches New Ford 9-Inch Rearend Upgrade for F-Body & X-Body
For enthusiasts and performance builders with 1967-69 and 1970-81 GM F-body (Camaro and Firebird) or 1968-1972 GM X-body vehicles, QA1’s new Ford 9-inch rearend and 4-link suspension kits offer a complete, one-click solution to outfit your vehicle with a direct-fit modern suspension and highly capable driveline package. Known for their durability and modular design, Ford 9-inch rearends have long been a top choice for high-performance applications, from the street to the track. QA1 enhances this platform with precision-engineered housings designed for superior strength and ease of installation, alongside fully adjustable 4-link suspension kits that improve handling and support wide tire setups.
QA1’s Ford 9-Inch
QA1’s 9-inch housing is fabricated with a focus on strength and lightweight performance, rated to handle up to 800 horsepower. The housing features 3-inch axle tubes with a 1/4-inch wall thickness, delivering exceptional rigidity without unnecessary weight. The housing is designed to accommodate both stock and mini-tubbed builds, with an available narrowed width option that provides maximum clearance for wider tires. The housing includes pre-welded QA1 brackets, engineered for direct compatibility with F-body and X-body 4-link systems, reducing installation time and eliminating guesswork.
The removable third member, a key feature of the Ford 9-inch design, simplifies gear swaps and maintenance. This modularity allows builders to adjust gear ratios quickly, providing flexibility for different performance setups without removing the entire rear assembly. QA1’s 9-inch housing and axle package is ready for you to drop your third member in and go. Combined with QA1’s focus on high-quality components and user-friendly features, such as integrated fill and drain ports, the 9-inch housing is an ideal solution for high-performance applications requiring robust, easy-to-maintain hardware.
Seamless Integration with QA1’s 4-Link Suspension
QA1’s 9-inch rearend system saves time by eliminating the need to research component compatibility and acquire parts from multiple sources. QA1 has configured these systems to best benef
The 4-link suspension kit included with QA1’s 9-inch rearend system provides substantial upgrades over stock leaf spring setups. Designed for direct bolt-in installation, this system offers full adjustability for ride height, ride quality, and handling characteristics, allowing for precise tuning. The triangulated 4-link eliminates the need for a locating device, improving handling dynamics and minimizing potential obstructions under the vehicle, simplifying the installation process. QA1’s narrowed housing option pairs seamlessly with the 4-link kit, allowing builders to maximize wheel and tire fitment, especially in mini-tubbed cars.
This rearend and suspension system offers a cohesive, performance-focused package, designed to improve cornering, traction, and overall responsiveness while supporting a wide range of brake and wheel configurations.
Brake Compatibility and Axle Specifications
The 9-inch rearend platform is known for its flexibility in accommodating various brake setups. QA1’s design retains this advantage by using Big Ford “Torino” style ends, compatible with a range of aftermarket brake options. Builders can easily integrate high-performance disc brakes, including larger rotors and multi-piston calipers, without additional modifications. The housing’s 2.5-inch axle offset ensures proper fitment with most brake kits, making it a versatile choice for street or track applications.
The included 31-spline axle shafts are rated for up to 650 horsepower, providing durability and reliability in high-stress environments. QA1 further simplifies the installation process by pre-installing roller bearings and pressing in wheel studs, reducing assembly time.
Key Features & Specifications
Complete Kit: Includes QA1’s 9-inch rear housing and triangulated 4-link, designed for a perfect fit in F-body and X-body vehicles.
Adjustable Coilovers: Fine-tune your ride height and handling for a perfect stance and performance.
Fabricated Ford 9-Inch Housing: Engineered for strength, rated for 800 horsepower, with 3-inch axle tubes and 1/4-inch wall thickness.
Stock and Narrowed Width Options: Stock width at 60 inches WMS-to-WMS, narrowed option at 54.75 inches for wider tire fitment in mini-tubbed builds.
31-Spline Axles: Rated for 650 horsepower, durable and compatible with a wide range of third member options.
Big Ford “Torino” Style Ends: Ensures compatibility with most aftermarket brake systems, including large rotor and multi-piston caliper setups.
Brake Compatibility: Supports both drum and disc brake options with a 2.5-inch axle offset for proper alignment.
Pre-Welded QA1 Trailing Arm & Sway Bar Brackets: Specifically designed for use with QA1’s 4-link suspension system, no additional welding required.
Pre-Installed Roller Bearings: Ready to install out of the box, reducing setup time for builders.
Wheel Studs: 5x4.75 bolt pattern, 3-inch studs for thicker alloy wheels, pressed in for ease of installation.
User-Friendly Design: Integrated fill and drain ports, vent port, and jack pad come standard for simplified maintenance.
Great Looks: QA1’s 9-inch rearend housing comes powdercoated for a refined appearance and long-lasting finish.
Available Configurations
Offered as housing-only, housing with axles and 4-link suspension kit, or part of a complete vehicle kit.
Standard width option
– 60” WMS (1st Gen F-body and '68-72 X-body)
– Easy to fit option
Narrowed width option
– 54-3/4” WMS
– Narrowed ~2.5” per side
– Allows for maximum width wheel and tire packages in mini tubbed cars
– Narrows further than leaf spring housings
Required Additional Components
Brakes: Source a brake kit for a 9-inch rear with Big Ford "Torino" Flanges and 2.5-inch axle offset
Third member: 31 spline
Driveshaft: potentially
Wheels (If Changing): 5x4-3/4-inch pattern
- Larger diameter depending on brake choice
- Housing width can determine appropriate wheel offset
- Stock width will be direct fit with any wheel offset that works with factory
- Note: Narrowed option moves WMS inboard by 2.5-inch per side
QA1’s Ford 9-inch rearend and 4-link suspension kits provide an all-in-one solution that combines superior strength, precise handling, and flexible brake and wheel options. For builders looking to take their GM F-body or X-body project to the next level, this product delivers the performance and ease of installation needed to support modern high-horsepower builds.