The 1st automotive software in the lock-up principle was Packard's Ultramatic transmission, launched in 1949, which locked up the converter at cruising speeds, unlocking in the event the throttle was floored for swift acceleration or as the car or truck slowed. The lifespan of the failing torque converter is unpredictable. https://alexisiypim.ssnblog.com/33065254/an-unbiased-view-of-torque-converter-clutch