GM 8.6-Inch Posi Limited Slip Differential

The Zumbrota Drivetrain RAA435-209A-P is a remanufactured complete axle assembly designed for GM 8.6-inch rear differentials. This unit comes with a 3.23 gear ratio and includes a Posi Limited Slip Differential (LSD) for enhanced traction. It is specifically built for 2009-2013 GMC 1500 models and is configured to exclude the active brake control and hybrid brake options (JF3, JF4, or JG4). During the remanufacturing process, each Zumbrota axle assembly undergoes thorough inspection for straightness, cracks, and surface wear. All internal components, including ring and pinions, gears, clutches, and carriers, are meticulously inspected and tested. New bearings and seals are installed in every unit. The gears are set up for optimal tooth contact patterns, correct rolling torque, and proper backlash to ensure quiet operation and longevity. Zumbrota employs a unique hydro-blast rinse and sandblasting procedure, followed by a proprietary shot-peened deep cleaning process, to prepare the internal and external parts, establishing a high standard for axle assembly remanufacturing. This axle assembly has an 8.6-inch ring gear size and a semi-floating axle type. The differential cover is included, but fluid is not. The Hollander number for this unit is 435-29A-P.