9in Aluminum Case - 3.250in Bore

The Strange 9in Aluminum Case with 3.250in Bore (Model N1904) is a lightweight differential case engineered for Ford 9-inch rear axle assemblies. Constructed from aluminum, this case reduces unsprung weight compared to cast-iron alternatives while maintaining structural integrity under load. The 3.250-inch bore specification accommodates standard pinion gear configurations common in street and performance applications where weight savings directly impact acceleration and fuel efficiency.

This 9in differential case arrives complete with adjuster nuts, bearing caps, and pinion support bolts—eliminating the need to source hardware separately. At 15.7 lbs, the aluminum construction delivers measurable weight reduction over traditional iron housings, a critical advantage in drag racing, autocross, and off-road applications where rotational mass directly influences performance. The natural finish allows for custom painting or coating to match existing drivetrain aesthetics or provide corrosion protection suited to your environment.

Builders restoring classic Ford platforms, upgrading independent rear suspensions, or constructing performance-oriented drivetrain systems rely on Strange Engineering components for consistent fitment and durability. The included fasteners and bearing hardware simplify assembly, reducing downtime and ensuring proper preload and alignment during installation. This case is ideal for street rods, muscle car restorations, off-road trucks, and competition vehicles where reliability and weight optimization are equally important.

The Ford 9-inch remains the industry standard for rear axle applications due to its robust design, aftermarket support, and proven track record. Strange Engineering's aluminum case option modernizes this classic architecture for contemporary performance demands. Verify bearing size, pinion support configuration, and any custom modifications required for your specific build before purchase.