Rear Differential Assembly 3.73 Ratio 12mm Studs Ford 9.75-Inch

The Zumbrota Drivetrain RAA435-2040C is a remanufactured rear differential axle assembly engineered for Ford 9.75-inch axles. This unit comes with a 3.73 gear ratio and 12mm wheel studs, and is specified for rear disc brakes. It is designed without Posi Traction and includes the differential cover, but does not include fluid. Each Zumbrota axle assembly is rebuilt to stringent quality standards, ensuring precision and reliability. The remanufacturing process involves a comprehensive inspection of the entire assembly for straightness, cracks, and surface wear. All internal components, including the ring and pinion gears, internal gears, and clutches, are meticulously inspected and tested. To guarantee longevity and optimal performance, all bearings and seals are replaced, and the gears are checked for proper tooth contact patterns and rolling torque. Backlash is precisely set for quiet operation and adequate gear lubrication, while the axle tubes are verified to meet OEM straightness standards. Zumbrota employs an exclusive cleaning process that includes hydro-blasting and sandblasting of both internal and external parts. This is followed by a proprietary deep cleaning method using shot enticement, which sets a high standard for remanufactured axle assemblies. The HOLLANDER number for this assembly is 435-24C. This axle assembly is specifically designed for the 1999-2000 Ford Expedition models equipped with a 9.75-inch ring gear and a 3.73 ratio. Buyers should 'Check Tag' to ensure compatibility. It is an semi-floating axle type.