Genuine OEM Volkswagen Driveshaft, part number 3D7521101K. This driveshaft, also known as a propeller shaft, is responsible for transmitting torque from the transmission or transfer case to the differential. It is a long, rotating shaft that connects these components, allowing for the transfer of power to the wheels. Manufactured to exact specifications, this driveshaft ensures smooth power delivery and proper alignment. Genuine OEM driveshafts are crucial for maintaining the correct balance, strength, and universal joint angles to prevent vibrations and ensure a long service life.