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Strengthen Your QA1 Four-Link Rear Suspension
The QA1 R901N custom Ford 9-inch rear housing adds a durable, bolt-on rear housing solution for compatible F-Body and GM X-Body vehicles already equipped with a QA1 four-link suspension system.
Key Features
- QA1 R901N custom fabricated Ford 9-inch rear housing
- Designed to bolt to an existing QA1 four-link suspension system
- Narrowed wheel mounting surface width of 54-3/4 inches
- Narrowed 2-1/2 inches per side for use with mini tubs and wider wheels and tires
- 3-inch outside diameter axle tubes with 1/4-inch wall thickness
- Formed trailing arm brackets help minimize flex under heavy loads
- Big Ford New Style Torino Flanges with a 2.5-inch axle offset
- Standard 5 x 4-3/4-inch bolt pattern
- 31-spline 1541H alloy axles support up to 650 horsepower
- Housing supports up to 800 horsepower
- Semi-gloss powder coat finish with high-quality roller bearings
- Made in the USA
Fitment
| Year Range | Make | Model | Fitment Notes |
|---|---|---|---|
| 1967-1969 | Chevrolet | Camaro | Requires an existing QA1 four-link suspension system. Ford 9-inch third member is required and not included. Verify wheel and tire fitment before installation. Narrowed housing is recommended with custom offset wheels and mini tubs. |
| 1967-1969 | Pontiac | Firebird | Requires an existing QA1 four-link suspension system. Ford 9-inch third member is required and not included. Verify wheel and tire fitment before installation. Narrowed housing is recommended with custom offset wheels and mini tubs. |
| 1968-1972 | Chevrolet | Nova | Requires an existing QA1 four-link suspension system. Ford 9-inch third member is required and not included. Verify wheel and tire fitment before installation. Narrowed housing is recommended with custom offset wheels and mini tubs. |
Specifications
| Detail | Value |
|---|---|
| Model | R901N |
| Housing type | Custom fabricated Ford 9-inch rear housing |
| Wheel mounting surface width | 54-3/4 inches narrowed |
| Narrowing | 2-1/2 inches per side |
| Axle tubes | 3-inch outside diameter with 1/4-inch wall thickness |
| Axles | 31-spline 1541H alloy axles |
| Axle capacity | Up to 650 horsepower |
| Housing capacity | Up to 800 horsepower |
| Flanges | Big Ford New Style Torino Flanges |
| Axle offset | 2.5 inches |
| Bolt pattern | 5 x 4-3/4 inches |
| Wheel studs | 1/2 x 3 inches |
| Wheel stud thread | 1/2-20 |
| Wheel stud knurl | 0.615 inch |
| Hub diameter | 2.770 inches |
| Finish | Semi-gloss powder coat |
| Suspension compatibility | QA1 four-link suspension system only |
| Third member | Required for Ford 9-inch housings with 31-spline axles and not included |
| Country of manufacture | USA |
| Warranty | 1 year against manufacturer defects |
What's Included
- 31-spline 1541H alloy axles
- T-bolts
- Housing studs
- High-quality roller bearings
- Drain plug
- Fill plug
- Jack pad
- Vent port
- Jack plate
About QA1
QA1 develops performance suspension and chassis components for demanding automotive applications. The QA1 R901N is engineered as a custom Ford 9-inch rear housing that integrates with a compatible QA1 four-link system and includes formed trailing arm brackets for added rigidity.
FAQ
What is the R901N?It is a custom fabricated, narrowed Ford 9-inch rear housing designed to bolt to an existing QA1 four-link suspension system.
Which vehicles fit this rear housing?It fits 1967-1969 Chevrolet Camaro and Pontiac Firebird vehicles, along with 1968-1972 Chevrolet Nova vehicles.
Can this housing be used with another suspension system?No. It is compatible only with a QA1 four-link suspension system.
Is the Ford 9-inch third member included?No. A Ford 9-inch third member for 31-spline axles is required and must be supplied separately.
How wide is the narrowed housing?The wheel mounting surface width is 54-3/4 inches, and the housing is narrowed 2-1/2 inches per side.
What horsepower can the axles support?The included 31-spline 1541H alloy axles support up to 650 horsepower. The housing supports up to 800 horsepower.
What bolt pattern does it use?It uses the standard 5 x 4-3/4-inch factory bolt pattern with 1/2 x 3-inch wheel studs.
Does it include brake components?No brake kit is included. The Big Ford New Style Torino Flanges provide brake compatibility.
Are custom wheels or mini tubs recommended?Yes. The narrowed housing is recommended for custom offset wheels and mini tubs. Wheel and tire fitment should be verified before installation.
Installation Instructions
- Confirm that the vehicle is one of the listed F-Body or GM X-Body applications.
- Verify that the vehicle has an existing QA1 four-link suspension system. This housing is designed for that system only.
- Check wheel and tire clearance before installation. Plan for custom offset wheels and mini tubs when required by the narrowed configuration.
- Obtain a compatible Ford 9-inch third member for 31-spline axles because the third member is required and is not included.
- Position the QA1 R901N housing in the existing QA1 four-link system and use its formed trailing arm brackets for the bolt-on installation. Custom fabrication is not required according to the product specifications.
- Install the supplied 31-spline alloy axles, T-bolts, housing studs, and roller bearings using the applicable QA1 installation procedures.
- Complete brake installation using compatible components for the Big Ford New Style Torino Flanges. No brake kit is supplied with the housing.
- Use the fill port, drain plug, vent port, and jack plate for filling and servicing the rear housing.
- Verify wheel, tire, suspension, and brake clearances before operating the vehicle.
QA1
QA1 suspension parts are stocked at Black Ops Auto Works for American muscle cars and classic trucks. Shop coilover kits, shock absorbers, springs, handling kits, four link systems, sway bars, strut kits, rod ends, and suspension hardware for the Mustang, Camaro, Corvette, Challenger, Charger, and GM B-Body, F-Body, and G-Body platforms. Every product is filterable by year, make, model, trim, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 536 QA1 SKUs across coilovers, shocks, springs, and handling kit categories. What This Brand Covers QA1 is a suspension manufacturer known for adjustable coilover systems, shock absorbers, and complete handling kits built for muscle cars, classic trucks, drag cars, and pro touring builds. The lineup covers everything from single component shock replacement to full vehicle handling packages. Brand Focus QA1 concentrates on American muscle car and classic truck platforms, with deep coverage of GM, Ford, and ...
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