The first automotive application of your lock-up basic principle 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 as the motor vehicle slowed. M (utmost efficiency point): With this issue the torque converter hits https://milovnbny.bloggazzo.com/33061638/considerations-to-know-about-torque-converter-clutch