Torque Converter
WARNING: This page is about a different car, the 2009 Volkswagen CC. However, it is still accessible from the selected car via links, so may be relevant.
The torque converter is equipped with a slip controlled torque converter lock up clutch. The lockup clutch closes depending on load and speed. The 2nd, 3rd, 4th, 5th and 6th gears can be mechanically driven (without slip).