Rear Axle Assembly 4.88 Grizzly Locker

The Zumbrota Drivetrain RAA435-1957X2-L is a performance-grade rear axle assembly engineered for 1999-2007 GM 2500 Pickups, including the 2007 Classic model. It features a robust 10.5-inch 14-bolt full float design with a 4.88 gear ratio and a Grizzly locker, built to enhance traction, support higher speeds, and improve towing capabilities when OE replacements are insufficient for demanding lifestyles. Zumbrota Drivetrain emphasizes precision and reliability in their remanufacturing process. Each axle assembly undergoes rigorous inspection for straightness, cracks, and surface wear. Internal components such as ring and pinions, gears, clutches, and carriers are meticulously inspected and tested. All bearings and seals are replaced as a standard procedure. The gear setup is fine-tuned for optimal tooth contact patterns and correct rolling torque, ensuring longevity and performance. While the differential is performance-grade and includes a locker, it is specified as not pre-filled with oil, requiring the user to add the appropriate lubricant upon installation.