The primary automotive software of the lock-up principle was Packard's Ultramatic transmission, released in 1949, which locked up the converter at cruising speeds, unlocking in the event the throttle was floored for swift acceleration or as being the car or truck slowed. Slippage consumes electrical power throughout the coupling phase. https://martinopomj.wizzardsblog.com/33923410/5-simple-statements-about-torque-converter-clutch-explained