Along with the 3-passage torque converter, two passages are useful for transmission oil (ATF) movement through the torque converter and for clutch cooling, though the third passage is utilised independently to control the lock and unlock on the clutch. Bear in mind, for those who suspect a foul torque converter, https://cruzltwxw.jaiblogs.com/61253708/the-best-side-of-torque-converter-clutch