The Commercial Drivers License (CDL) Study Guide

 

Multi-Speed Rear Axles 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.

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Special conditions where you should downshift are:

Automatic Transmissions

Retarders

You can click on the safety tips for more information.

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