Ford 8.8 in. IRS 3.73 Posi Limited Slip Differential Axle

The Zumbrota Drivetrain RAA440-1384D is a remanufactured axle assembly engineered for Ford 8.8-inch Independent Rear Suspension (IRS) differentials. This specific unit features a 3.73 gear ratio and a Posi Limited Slip Differential, designed to enhance traction and performance. Each Zumbrota Drivetrain axle assembly undergoes a rigorous remanufacturing process. The housings are meticulously inspected for straightness, cracks, and surface wear to ensure structural integrity. Internally, all components—including the ring and pinion gears, internal gears, clutches, and carriers—are subjected to comprehensive inspection and testing. To guarantee longevity and optimal performance, all bearings, seals, crush sleeves, pinion nuts, and shims are replaced with new parts. The gears are carefully inspected for precise tooth contact patterns, and correct rolling torque is established using inch-pound measurements. Gear backlash is precisely set to ensure proper lubrication and quiet operation. Zumbrota employs an exclusive hydro-blast rinse and sandblasting procedure on both internal and external parts, followed by a proprietary shot-enticed deep cleaning process. This advanced cleaning method restores the housings to an OEM finish and prepares them for optimal reassembly. Units are shipped in high-density plastic totes to minimize the risk of in-transit damage. This remanufactured axle assembly is compatible with the 2002-2005 Ford Explorer models equipped with the 8.8 IRS differential and a 3.73 ratio with Posi LSD.