Which of the following signals the transmission to go into passing gear?

The mechanism for shifting into passing gear in an automatic transmission is typically initiated by an electrical switch or mechanical linkage. In many modern vehicles, the transmission control module (TCM) receives information from the accelerator pedal position sensor. When the driver accelerates to pass another vehicle, this sensor sends a signal to the TCM. The TCM then engages the passing gear by activating the appropriate electrical switch or adjusting a mechanical linkage. This allows the transmission to downshift, providing the engine with more power for increased acceleration.

The role of electrical components and mechanical connections is crucial because they translate the driver's intention to accelerate quickly into a suitable action within the transmission, ensuring a timely and effective response.