Shifting and Operating Transmissions

Shifting Patterns

What is the shifting pattern in a semi-truck?  There are several different shifting patterns in manual transmission semi-trucks based on the type of transmission.  It is important to review the shifting pattern in your vehicle before you begin the operation.  Two of the most common transmission shifting patterns are the 10 speed transmission and the 13 speed transmission.  This is the 10 speed transmission shifting …

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How to synchronize the engine

What are synchronizing skills when shifting?  A non-synchronous transmission is a form of transmission based on gears that do not use synchronizing mechanisms. To synchronize means to mesh or match.  A manual transmission in a car is synchronized, so you simply push in the clutch and shift.  Non-synchronized transmissions — like in most commercial trucks — require the driver to manually synchronize so that the transmission’s input gearing speed (engine speed …

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Gauges and Other Systems Used When Shifting

What gauges on the dashboard are used in shifting?  The speedometer and tachometer are both necessary for shifting gears.  The speedometer measures the road speed in miles per hour (MPH). The tachometer measures the engine speed.  The tachometer displays the engine speed in revolutions per minute (RPMs) for each gear.  When your vehicle reaches the maximum speed for a gear, you must upshift.  When your vehicle reaches …

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Non-Synchronized Transmissions

What is a non-synchronized transmission?  A non-synchronized transmission requires the driver to manually synchronize the transmission’s input speed (engine RPM) and output speed (driveshaft speed).  When done properly, there should be no grinding of gears.  To properly shift a manual transmission, a driver needs to learn how to “double clutch.”  What is double clutching?  When driving a non-synchronized transmission, …

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Manual Transmission Shift Controls

What controls are needed to shift gears?  A “manual” transmission is one that the driver controls the transmission gears.  The transmission is a case of gears located behind the engine and clutch.  It transmits engine power so the truck has the right speed and torque.   When you drive a manual transmission, three controls are needed to shift gears: the fuel pedal, clutch and gearshift …

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