This tapered roller bearing supports the axle shaft within the rear final drive housing. It handles combined radial and thrust loads from the drive train, maintaining correct gear mesh between the differential and the planetary reduction set. A worn bearing produces a low rumble that increases with vehicle speed and load, followed by gear whine as the mesh pattern shifts. The original-specification raceway profile and roller geometry match the housing bore and shaft journal, so no shimming or adapter sleeves are required for installation.