Together with the three-passage torque converter, two passages are used for transmission oil (ATF) circulation from the torque converter and for clutch cooling, although the 3rd passage is made use of independently to regulate the lock and unlock from the clutch. The tables down below summarises the definition of each https://torque-converter-clutch82530.actoblog.com/34660605/little-known-facts-about-torque-converter-clutch