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Manual transmission
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=== Non-synchronous transmission === {{Main|Non-synchronous transmission}} [[File:Crash gearbox 3gears and reverse.gif|thumb|right|3-speed non-synchronous "crash" gearbox; used in automobiles pre-1950s and semi-trailer trucks]] Another design of transmission that is used in older [[car]]s, [[Semi-truck|trucks]], and [[tractor]]s, is a non-synchronous transmission (also known as a crash gearbox). Non-synchronous transmissions use a sliding-mesh (or constant-mesh, in later years) design and have the nickname "crash" because the difficulty in changing gears can lead to gear shifts accompanied by crashing/crunching noises. {{clear}}
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