This implies that there's a great deal of electricity dropped within the torque converter, dissipated as heat. So as to boost its efficiency, brands added a lock-up clutch towards the torque converter. Slippage consumes power in the coupling stage. Locking the converter shell to your turbine shaft prevents this slippage https://zanderqxcei.rimmablog.com/33130692/a-simple-key-for-torque-converter-clutch-unveiled