The first automotive application on the lock-up principle was Packard's Ultramatic transmission, launched in 1949, which locked up the converter at cruising speeds, unlocking once the throttle was floored for rapid acceleration or since the car or truck slowed. Finally, galling with the mating components takes place, which triggers seizure. https://torque-converter-clutch60135.activoblog.com/36909863/fascination-about-torque-converter-clutch