If you are going to be towing, you want a lock-up torque converter. Towing will add heat to the transmission. A non-lock-up torque converter will add more heat. With a lock-up when you get to speed, the torque converter will lock-up, which creates a direct drive from engine to transmission.Click to see full answer. Furthermore, what’s the difference between lock up and non lockup transmission?non lock up. Torque converters are an internal fluid pump that pressurizes and moves fluid across a stator to multiply torque at low speeds. At high speeds they become increasingly efficient, but still slip. “lockup” refers to a clutch in the converter that when pressure is applied locks and eliminates converter slip.Secondly, how do I know if my torque converter is locking up? You can see this by looking at the RPM’s, once moving at steady speed give the car a little gas, you will see the RPM’s rise but the car will not speed up much. When a lock up torque converter locks the and you give it a little gas the RPM’s will not rise until the car starts moving faster. Just so, what is a lockup converter? In a vehicle with an automatic transmission, the torque converter connects the power source to the load. Some of these devices are also equipped with a “lockup” mechanism which rigidly binds the engine to the transmission when their speeds are nearly equal, to avoid slippage and a resulting loss of efficiency.What happens when torque converter locks up?It allows the engine to turn at a lower RPM when the vehicle is traveling at higher speeds. However, when the engine turns more slowly it causes the torque converter to slip, creating heat. The solution is to lock the converter. Lock-up eliminates the slippage, which reduces heat and improves fuel economy.