Remanufactured Axle Assembly 3.73 Ratio 9.75-Inch Ring Gear

The Zumbrota RAA435-2031D is a remanufactured axle assembly meticulously rebuilt for the 1999 Ford F-150 model equipped with a 9.75-inch ring gear and a 3.73 gear ratio, featuring rear disc brakes. Zumbrota Drivetrain prioritizes precision and reliability, ensuring each axle assembly undergoes thorough inspection for straightness, cracks, and surface wear. Internal components, including ring and pinions, gears, clutches, and carriers, are fully inspected and tested. All bearings and seals are replaced as standard. The assembly features gears set for optimal tooth contact patterns and correct rolling torque, measured in inch-pounds for precise setup and longevity. Proper gear backlash is maintained to ensure adequate gear lubrication and quiet operation, with axle tubes inspected to meet OEM standards for straightness. Zumbrota employs an exclusive hydro-blast rinse and sandblasting procedure on both internal and external parts, followed by a proprietary shot-enticed deep cleaning process. This rigorous cleaning method sets a high standard for remanufactured axle assemblies. Key specifications include a 9.75-inch ring gear, Ford build, Hollander No. 435-231D, a 3.73 gear ratio, rear disc brakes, 12mm wheel studs, 2.533 OD wheel bearings, and it is without Posi Traction. The axle type is semi-floating, and a cover is included, though fluid is not.