A lock-up torque converter includes a constructed-in locking clutch mechanism. When the transmission senses a selected velocity or engine RPM, the torque converter will make use of the clutch to lock in a very immediate relationship in between the enter and output shafts for much better performance. Stator clutch breakage: https://torque-converter-clutch40470.thelateblog.com/34483632/details-fiction-and-torque-converter-clutch