3.73 Posi Rear Axle Assembly

The Zumbrota Drivetrain RAA435-201B-P is a remanufactured rear axle assembly designed for specific 2009-2011 Dodge Ram 3500 Dual Rear Wheel (DRW) Cab Chassis applications. This unit features an 11.5-inch AAM ring gear, a 3.73 gear ratio, and a Posi Limited Slip Differential for enhanced traction. Each Zumbrota axle assembly is meticulously rebuilt to exacting quality standards. The remanufacturing process includes thorough inspection of all internal components—ring and pinions, gears, clutches, and carriers—for wear and damage. All bearings and seals are replaced with new parts. Gears are set for optimal tooth contact patterns, correct rolling torque measured in inch-pounds, and proper backlash to ensure longevity and quiet operation. Axle tubes are also inspected to meet OEM straightness specifications. Zumbrota employs a rigorous cleaning procedure, starting with hydro-blasting and sandblasting of internal and external parts, followed by a proprietary shot-enticing deep cleaning process. This ensures a clean foundation for the rebuilt assembly, setting a high standard for remanufactured axle assemblies. This specific axle assembly is compatible with 2009, 2010, and 2011 Dodge Ram 3500 models configured as Cab Chassis with Dual Rear Wheels and the 11.5-inch rear axle. It is explicitly stated to have a 3.73 gear ratio and a Posi Traction (Limited Slip) differential. A cover is included, but fluid is not.