What is the difference between a lock up and non lock up torque converter? When the converter is "locked up" this clutch is forced against the front of the converter creating a direct drive from engine to transmission. If you're working with an older mechanically controlled automatic with a lock up converter there are several variations of lock up kits available on the market today. The kits are available to fit most mechanical transmissions and will provide you with step-by-step instructions for installation as well as parts and complete instructions. Lock up torque converter s are an aftermarket product and are a great option for those who are looking to add some additional performance and power to their vehicle. https://www.totalperformance.net.au/ls-4l60e-torque-converters-for-sale