3.55 Posi-Traction Differential Carrier

The Zumbrota Drivetrain RAA435-2023B-P is a remanufactured complete axle assembly designed for the Ford 9.75-inch rear axle. This unit comes with a 3.55 gear ratio, is configured for rear disc brakes, and includes a Posi-Traction (LSD) limited-slip differential. The tag number associated with this assembly is S933D. This axle assembly is rebuilt to exacting standards, ensuring precision and reliability. Zumbrota Drivetrain thoroughly inspects all internal components, including ring and pinions, internal gears, clutches, and carriers, for wear and proper function. As part of the remanufacturing process, all bearings, seals, crush sleeves, pinion nuts, and shims are replaced with new components. The gears are meticulously set to achieve optimal tooth contact patterns and correct rolling torque, measured in inch-pounds for precision and longevity. Gear backlash is set to OEM specifications to ensure proper lubrication and quiet operation. Zumbrota employs an exclusive cleaning process that includes hydro-blasting and sandblasting of internal and external parts, followed by a proprietary deep cleaning method. This ensures the housing is returned to an OEM finish. Additionally, axle tubes are inspected and straightened to meet OEM standards for straightness, and housings are tested for surface wear and cracks. It is important to note that this assembly does not include hubs, brakes, backing plates, or axle shafts. The wheel studs are 12 mm, and the wheel bearing surface diameter is 1.71 inches.