Transmissions and transaxles are an assembly of gears and shafts designed to transmit power to the drive wheels of vehicles. Power from the engine is provided in the form of torque, or twisted force. The amount of this force varies a great deal, depending on the individual characteristics of the engine and the speed at which the engine is running.
When the driver shifts a manual transmission of transaxle, some gears disengage and others engage inside the transmission. However, these gears are moving at different speeds and could grind during shifting. Synchromesh components are used to resolve this possible gear-grinding situation. A synchromesh system equalizes the speed of each gear for smooth shifting without gear grinding.
Some older manual transmissions do not have synchronizers, requiring them to be "double clutched." The statement "If you cannot find 'em, grind 'em" typically applies to non-synchromesh transmissions common to older cars, school busses and
heavy-duty equipment.
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