The main automotive application on the lock-up theory was Packard's Ultramatic transmission, introduced in 1949, which locked up the converter at cruising speeds, unlocking if the throttle was floored for speedy acceleration or since the motor vehicle slowed. Nevertheless, Like all mechanical element, torque converters can don out or malfunction https://torque-converter-clutch42963.thezenweb.com/torque-converter-clutch-an-overview-72019315