VAALLEY FRONT DIFFERENTIAL DS404

The DS404 forward axle is designed to work as part of a tandem set, typically paired with an RS404 rear differential. It uses single-reduction hypoid gearing rated for a 40,000 lb GAWR and is commonly rebuilt or replaced when the gear set, bearings, or power divider internals wear out—symptoms include noise, vibration, or loss of power to the rear axle. The part number suggests a 3.36:1 gear ratio and 41-spline axle shafts, a combination often found in line-haul, vocational, and dump applications.