The transmission is probably one of the most complicated components in your vehicle. The transmission is a metal case that houses a series of gears – which explains its nickname of “gearbox”.
The transmission takes power from the engine and delivers it to the wheels to help power your vehicle. It is responsible for making sure the right amount of power goes to the wheels so it can operate at a given speed.
Each gear operates within a specific ratio to ensure that the wheels and engine don’t spin at the same speed. When you take off from a dead stop, your vehicle uses a lower gear ratio to get the car moving using more power and less speed. At higher speeds, your transmission uses a higher gear ratio to move the vehicle while keeping the RPMs at a low level.