When overdrive is engaged, the transmission uses a larger gear ratio than the other gears. This means that the wheels turn more times for each revolution of the engine. As a result, the engine can run at a lower RPM without losing speed.
Overdrive is typically used on highways or other roads where the vehicle can maintain a steady speed. It is not recommended for use in city driving or other situations where the vehicle frequently stops and starts.
Most modern vehicles have an overdrive button on the gearshift lever. When the overdrive button is pressed, overdrive is engaged. When the overdrive button is released, overdrive is disengaged.
Some vehicles also have an automatic overdrive feature. With automatic overdrive, the transmission automatically engages and disengages overdrive based on the vehicle's speed and engine RPM.
Overdrive can be a valuable tool for improving fuel efficiency and reducing engine wear. However, it is important to use it correctly to avoid damaging the transmission.
