Rear Axle Assembly 3.55 Posi Traction

The Zumbrota Drivetrain RAA435-2029B-P is a remanufactured complete axle assembly meticulously rebuilt for 1998-1999 Ford F150 models equipped with a 9.75-inch ring gear. This assembly features a 3.55 gear ratio, rear disc brakes, and a Posi Traction limited-slip differential. Please check the tag numbers (S909A, S909B, S909C) to ensure compatibility. Zumbrota Drivetrain emphasizes precision and reliability in their remanufacturing process. Each axle assembly undergoes a rigorous inspection for straightness, cracks, and surface wear. All internal components, including ring and pinions, internal gears, clutches, and carriers, are fully inspected and tested. New bearings, seals, crush sleeves, pinion nuts, and shims are installed. Gears are set for optimal tooth contact patterns and precise rolling torque, with backlash adjusted for lubrication and quiet operation. Axle tubes are verified for OEM straightness standards. The remanufacturing process includes an exclusive hydro-blast rinse and sandblasting procedure, followed by a proprietary shot-enticed deep cleaning, setting a high standard for axle assembly remanufacturing. The housing is tested for surface wear and cracks, and gears are inspected for optimal tooth contact patterns and correct rolling torque using inch-pound measurements for precise setup and longevity. Correct gear backlash is set to ensure proper gear lubrication and quiet operation. This assembly does not include hubs, brakes, backing plates, or axle shafts. It is backed by a 2-year limited warranty.