The torque converter is a doughnut-shaped assembly located between the engine and the transaxle inside the bellhousing. The torque converter transmits engine output to the transmission, and also multiplies engine torque at low vehicle speeds. The torque converter is a fluid coupling. Curved impeller vanes inside the housing set up a flow of ATF that drives another vaned wheel opposite it, called the turbine. The turbine drives a hollow shaft that transmits power to the planetary gear system in the transmission. The central set of vanes in the torque converter is called the stator. At low speeds, a one-way clutch keeps the stator stationary so that its curved vanes will redirect the flow of ATF in such a way that torque is multiplied. At higher speeds, when there is no longer a speed differential between the impeller vanes and the turbine, the stator free-wheels and torque multiplication ceases.