Torque converter takes advantage of the centrifugal pressure and throws the oil out of it. It really works like an oil pump. Fluid from inside the converter casing spreads through the turbine. The turbine absorbs this fluid and starts rotation. It is actually straight attached to your output shaft. https://gearbox89011.bloggazza.com/32826542/the-smart-trick-of-gearbox-that-no-one-is-discussing