3.73 Gear Ratio Rear Axle Assembly

The Zumbrota Drivetrain RAA435-213A is a meticulously remanufactured axle assembly, engineered to meet the highest standards of precision and reliability for your Ford 9.75" differential. This unit is specifically built for 2009-2011 Ford F-150 models equipped with the Heavy Duty Payload Package featuring 7-lug axles. It comes with a 3.73 gear ratio and is designed for trucks without Posi Traction. During the remanufacturing process, each axle assembly undergoes a thorough inspection for straightness, cracks, and surface wear. All internal components, including ring and pinions, internal gears, clutches, and carriers, are fully inspected and tested. Critically, all bearings and seals are replaced with new parts. The gears are carefully inspected to ensure optimal tooth contact patterns and precise rolling torque, using inch-pound measurements for optimal setup and longevity. Correct gear backlash is set to guarantee proper gear lubrication and quiet operation. Zumbrota Drivetrain employs an exclusive hydro-blast rinse and sandblasting procedure on both internal and external parts, followed by a proprietary shot-peened deep cleaning process. This comprehensive cleaning and inspection regimen sets the standard for axle assembly remanufacturing, ensuring a quality component ready for installation. The axle tubes are also inspected to meet OEM standards of straightness. This assembly includes the differential cover but does not include axle fluid.