A lock-up torque converter has a created-in locking clutch system. After the transmission senses a selected velocity or engine RPM, the torque converter will utilize the clutch to lock in the immediate link involving the input and output shafts for greater performance. Visible Inspection:  Start with a standard Visible inspection. https://torque-converter-clutch20741.dailyhitblog.com/39401608/fascination-about-torque-converter-clutch