3.42 Ratio Differential Gear Set

The Zumbrota Drivetrain RAA440-1478 is a remanufactured axle assembly engineered for specific GM 8.25-inch IFS applications. This unit comes equipped with a 3.42 gear ratio, identified by the GU6 ratio option, and is specifically designed for 2013-2014 GMC 1500 models, including the Sierra 1500. Each Zumbrota axle assembly is rebuilt to exacting standards, ensuring precision and reliability. The remanufacturing process involves a thorough inspection of all internal components, including ring and pinions, internal gears, clutches, and carriers. All bearings, seals, crush sleeves, pinion nuts, and shims are replaced with new parts. The gears are meticulously inspected for optimal tooth contact patterns and set to correct rolling torque using inch-pound measurements for maximum setup precision and longevity. Proper gear backlash is also set to ensure adequate lubrication and quiet operation. Internal and external parts undergo a rigorous cleaning process, including hydro-blasting and sandblasting, followed by a proprietary shot-peening deep cleaning procedure. Axle tubes are inspected to confirm they meet OEM standards for straightness. Units are shipped in high-density plastic totes to minimize transit damage. This assembly is backed by a 2-year limited warranty.