The 123 gears are an important part of the car's transmission. They help to change the gear ratio between the engine and the wheels. This allows the car to accelerate and decelerate smoothly, while also providing power when needed.
Without these gears, the car would not be able to function properly. It is important to make sure that they are well-maintained and in good working order. If you notice any problems with your 123 gears, it is best to take your car to a mechanic for further inspection.