Using the 3-passage torque converter, two passages are useful for transmission oil (ATF) movement in the torque converter and for clutch cooling, although the third passage is used independently to manage the lock and unlock on the clutch. The pump part of your torque converter is attached for the housing. https://torqueconverterclutch17272.blogofchange.com/34847265/a-review-of-torque-converter-clutch