When driving a commercial vehicle with multi-speed rear axles and auxiliary transmissions, drivers can access the extra gears by using the selector switch that is located:

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When driving a commercial vehicle with multi-speed rear axles and auxiliary transmissions, the control switch is located on the gearshift lever. This switch is usually flipped up or down, depending on which gear range the driver needs. All drivers must understand that the shifting pattern may vary from one maker of vehicle to the next and should spend time learning the pattern of a new vehicle before attempting to drive it on the road.

When Driving a Commercial Vehicle with Multi-Speed Rear Axles and Auxiliary