Torque converter can take benefit of the centrifugal force and throws the oil from it. It works like an oil pump. Fluid from inside the converter casing spreads throughout the turbine. The turbine absorbs this fluid and starts rotation. It is actually instantly hooked up towards the output shaft. https://gearbox20741.pointblog.net/the-smart-trick-of-gearbox-that-no-one-is-discussing-77385641