Park the vehicle in a safe location and turn off the engine.
Engage the parking brake.
Locate the overdrive switch. This may be located on the gearshift lever or on the dashboard, near the gear selector.
Disconnect the electrical connector from the overdrive switch.
Remove the old overdrive switch. This may require removing a few screws or clips.
Install the new overdrive switch.
Reconnect the electrical connector to the overdrive switch.
Test the overdrive switch to ensure it is working properly.
The level of difficulty and time required for this task can vary depending on the specific vehicle model and the accessibility of the overdrive switch. It is recommended to consult a repair manual or seek assistance from a qualified mechanic if you are not comfortable performing this repair yourself.