Using the 3-passage torque converter, two passages are useful for transmission oil (ATF) movement from the torque converter and for clutch cooling, while the 3rd passage is utilised independently to control the lock and unlock of the clutch. The torque converter is positioned between the motor as well as transmission. https://rowanahlmn.eedblog.com/34351468/the-smart-trick-of-torque-converter-clutch-that-no-one-is-discussing