Genuine OEM Audi Flange Shaft, part number 0B4409809C. This component serves as a critical link in the drivetrain, responsible for transferring power from the transmission to the axle assembly. It is engineered to withstand high rotational forces and torque loads. Genuine OEM parts ensure the correct spline geometry and material hardness required for a vibration-free service life and long-term durability within the transmission system.