External Controls

External Controls
The transmission shift cable transfers the transmission operating mode from the gearshift lever to the automatic transmission. The indicated position of the transmission control selector lever is transferred to the transmission through the steering column shift selector on the 4R70W transmission, or the floor shifter mechanism on the 4R100 transmission, then to the cable and down to the manual control lever on the transmission.

Shift Interlock System
The shift interlock system prevents the shifting from PARK unless the brake pedal is depressed. The shift interlock system consists of a shift lock actuator mounted at the base of the steering column or on the floor shifter mechanism. If the ignition switch is in the RUN position, the shift lock actuator is on unless the brake pedal is depressed.

Transmission Control Switch (TCS)
The Transmission Control Switch (TCS) is a momentary contact switch that is located on the end of the column transmission control selector lever or on the floor shifter knob. Pushing the TCS will either disengage or engage the overdrive function of the automatic transmission. If the OVERDRIVE is disengaged, the word OFF will illuminate on the instrument panel.