Genuine OEM Volkswagen flange shaft, part number 0AZ409355A. This shaft is a key component in the drivetrain, facilitating the transfer of power from the transmission or transfer case to the axle. It is located within the drivetrain assembly. Genuine OEM flange shafts are manufactured with specific heat-treated steel to ensure durability and precise spline engagement, which is essential for preventing drivetrain vibration and ensuring a secure fit.