Automatic Transmission in Semi Trucks. It is worth noting that the most common kind of automatic transmission uses hydraulic power in order to shift gears. The device seamlessly combines a torque or, sometimes, a fluid coupling converter with suitable gearsets,.. A gearbox that works semi-automatically (also known as automated manual) requires the driver to make gear changes themselves, like with a manual gearbox. The key difference is that while a manual 'box requires the use of a clutch pedal, a semi-automatic removes this part from the driver's reach and completes its function electronically.

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Semi-automatics still have a manual gearbox just like a manual transmission. This gearbox must be used to shift gears too. But, the difference is that you don't need to depress a clutch before you use the gearbox. The electronic components will automatically manage the clutch for you. This is how you can shift smoothly and quicker.. A semi-automatic transmission is a manual transmission that does not use a clutch. Instead, the gears shift as the driver gives a command that gets sent through electronic sensors and processors. These sensors replace the clutch pedal, which would normally be depressed by the driver before shifting gears. Now the electronics tell the clutch.