The engagement and disengagement with the lock-up clutch depends on the direction the fluid enters the torque converter. The automatic transmission fluid can enter either through the front of the lock-up clutch or between the impeller and turbine, behind the clutch. The impeller (1) is rotated because of the crankshaft https://torqueconverterclutch18394.csublogs.com/41294741/top-guidelines-of-torque-converter-clutch