The first automotive software from the lock-up basic principle was Packard's Ultramatic transmission, launched in 1949, which locked up the converter at cruising speeds, unlocking when the throttle was floored for rapid acceleration or as the car slowed. So, you suspect your torque converter is likely to be acting up. https://riveryxvrr.get-blogging.com/34505941/5-simple-statements-about-torque-converter-clutch-explained