[Low69CST]

maybe if someone is going to tow a big trailer but want their RPM's up, they will have it so the converter locks up once they are cruizing down the highway. If this is what your after, the adjustable mph switch is exactly what you want. It will lock up the conveter at a certain mph no matter what gear your in. For instance, say your transmission always shifts into od no later than 50mph. So you set the switch to lock up at 55mph. No matter if you keep your selector in Drive instead of overdrive your converter will still lock up at 50mph in Drive. That way you can lock your converter and keep the rpm's up.