The torque converter clutch comes into action to mitigate the inherent inefficiency with the fluid coupling at better speeds. Launch oil exiting from your turbine shaft forces the clutch off the cover floor. The two-path converter then has stream when the discharge oil has separated the clutch from the quilt. https://deanbhfdz.aioblogs.com/87250829/5-simple-statements-about-torque-converter-clutch-explained