While using the a few-passage torque converter, two passages are useful for transmission oil (ATF) flow through the torque converter and for clutch cooling, though the 3rd passage is employed independently to regulate the lock and unlock in the clutch. On the other hand,  I strongly advise versus ignoring these https://torqueconverterclutch68912.wizzardsblog.com/33923812/new-step-by-step-map-for-torque-converter-clutch