GM 8.6 4.88 Open Differential Rear Axle Assembly

The Zumbrota RAA435-208X2 is a performance-grade rear axle assembly specifically designed for GM 8.6, '09-'13 GM 1500 Pickup trucks featuring an open differential and a 4.88 gear ratio. Zumbrota remanufactures these axle assemblies to exacting standards, ensuring precision and long-term reliability. The process includes comprehensive inspection of all housing tubes for straightness, as well as thorough testing of housings for surface wear and cracks. Internally, all components, including ring and pinions, internal gears, clutches, and carriers, undergo rigorous inspection and testing. To guarantee optimal performance and longevity, all bearings and seals are replaced with new ones. The gear setup is meticulously calibrated, with a focus on achieving perfect tooth contact patterns and correct rolling torque, measured precisely in inch-pounds. This specific assembly features an open differential and a 4.88 gear ratio, offering a significant upgrade for demanding driving conditions. Zumbrota utilizes an exclusive hydro-blast rinse and sandblasting procedure, followed by a proprietary shot-enticed deep cleaning process on both internal and external parts, setting a high benchmark for remanufactured axle assemblies.