Overdrive Switch: Description and Operation

The Transmission Control Switch (TCS) is a driver-controlled momentary contact switch mounted on the end of the transmission range selector lever. When the TCS is activated, 4th gear operation (overdrive) is canceled, coast clutch is applied, and engine braking is provided in 1st, 2nd, 3rd and reverse gears. The Transmission Control Indicator Lamp (TCIL) will illuminate indicating that the transmission control switch (TCS) has been depressed and 4th gear has been cancelled.