This comprehensive repair kit for a two speed gear box in the Atlas 55 family consolidates the essential components required for a thorough refurbishment and reassembly. Included are items such as hex lock boss, O ring, jack shaft, groove pins, output gear, idler gear, the gear box housing, grease fitting, self tapping screws, input gears low and high, shift shaft, groove pins, and boss bearing. The assembly enables restoration of gear mesh accuracy, shift quality, and overall torque transfer between the input drives and the output stage, helping to recover original performance and service life. VMRS code 077-003-059 classifies this gear box related repair kit within the maintenance taxonomy, while category 42728 places it among power transfer and drivetrain components used in heavy duty applications. Practically, technicians can conduct a complete rebuild with confidence that all critical components are matched to OEM tolerances, reducing downtime, extending component life, and improving reliability in on road and depot scenarios where Atlas 55 gear boxes are deployed.