View shift patterns for semi-truck?

Gears six to ten (and high speed reverse) are accessed by a Lo/High range splitter; gears 1-5 are Lo range; gears 6-10 are High range using the same shift pattern. A Super-10 transmission, by contrast, has no range splitter; it uses alternating "stick and button" shifting (stick shifts 1-3-5-7-9, button shifts 2-4-6-8-10). 13,15 and 18 speed transmission have the same basic shift pattern, but include a splitter button to access to additional ratios found in each range.

Some may have 12. Another difference between semi-trucks and cars is the way the clutch is set up. On an automobile, the clutch pedal is depressed full stroke to the floor for every gear shift to ensure the gearbox is disengaged from the engine.

On a semi-truck with constant mesh transmission (non synchronized), such as by the Eaton Roadranger series, not only is double clutching required, but a clutch brake is required as well. The clutch brake stops the rotation of the gears, and allows the truck to be put into gear without grinding when stationary. The clutch is pressed to the floor only to allow smooth engagement of low gears when starting from a full stop; when moving, the clutch pedal is pressed only far enough to break torque for gear changes.

An electrical connection is made between the tractor and the trailer through a cable often referred to as a "pigtail.".