Genuine OEM Volkswagen Gear Housing, part number 01P321102D. This is the main external casing that encloses and protects the internal components of the transmission. It ensures the precise alignment of gears, bearings, and shafts, and provides a sealed environment for lubrication. Genuine OEM gear housings are manufactured to exact tolerances, ensuring proper sealing, structural integrity, and resistance to transmission operating stresses for long-term durability.