Dana 60 SRW Rear Axle Assembly 3.55 Posi LSD

The Zumbrota Drivetrain RAA435-2121C-P is a remanufactured axle assembly built to deliver reliable performance for Dana 60 applications. This specific unit is configured with a 3.55 gear ratio, designed for Single Rear Wheel (SRW) Ford E350 models from 2003-2004, and features a Posi Limited Slip Differential (LSD) for enhanced traction. It begins with a thorough inspection of all axle tubes to ensure they are straightened to OEM specifications. The housing itself is meticulously tested for surface wear and cracks to guarantee structural integrity. Internally, every component, including the ring and pinion, gears, clutch packs, and carrier, is subjected to a 100% inspection. To ensure longevity and performance, Zumbrota Drivetrain replaces all bearings, seals, crush sleeves, pinion nuts, and shims with new parts. The housings are then cleaned using a state-of-the-art hydro blasting and rinsing process, restoring them to an OEM finish. Finally, the correct rolling torque is precisely established using inch-pound measurements, guaranteeing optimal setup and extended service life for the remanufactured axle assembly.