It also lets you speed up as soon as you are out of the curve. And Auxiliary Transmissions Multi-speed rear axles and auxiliary transmissions are used on many vehicles to provide extra gears. You usually control them by a selector knob or switch on the gearshift lever of the main transmission. There are many different shift patterns. Learn the right way to shift gears in the vehicle you will drive.
Some vehicles have automatic transmissions.
You can select a low range to get greater engine braking when going down grades. It is very important to use this braking effect when going down grades. Retarders help slow a vehicle, reducing the need for using your brakes. They reduce brake wear and give you another way to slow down. All retarders can be turned on or off by the driver.