Genuine OEM Volkswagen Differential Housing, part number 0A4409021AC. This housing is a critical structural component of the transmission, enclosing and protecting the differential gears. It ensures proper alignment of the gears and maintains the integrity of the transmission assembly. The housing weighs 6.677 kg. Genuine OEM differential housings are cast and machined to exact tolerances, ensuring the precise meshing of gears and the smooth transfer of power to the drive wheels.