A lock-up torque converter has a constructed-in locking clutch mechanism. Once the transmission senses a particular velocity or engine RPM, the torque converter will make use of the clutch to lock in a very direct relationship among the input and output shafts for much better effectiveness. M (most effectiveness point): https://kameronnomlk.frewwebs.com/34506787/new-step-by-step-map-for-torque-converter-clutch