The torque converter is a kind of fluid coupling that is widely used as a start-up device for automobiles equipped with an automatic transmission. A lock-up clutch is often incorporated in the torque converter in order to improve vehicle fuel economy in the higher speed ratio range. This improvement is obtained because the lock-up clutch can reduce fluid losses by engaging the input a... https://www.roneverhart.com/Black-Sabbath-Purple-Logo-Metal-Pin/