whats a torque converter - Learn about the function and importance of torque converters, how they work, and how to maintain them. Find out how a torque converter can enhance your vehicle's performance and improve fuel efficiency. A torque converter is a type of fluid coupling that's used in automatic transmissions. It's responsible for transmitting power from the engine to the transmission and ultimately to the wheels. The torque converter consists of three primary components: the impeller, the turbine, and the stator.