gear box

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Noun1.gear box - the shell (metal casing) in which a train of gears is sealed
casing, shell, case - the housing or outer covering of something; "the clock has a walnut case"
transmission system, transmission - the gears that transmit power from an automobile engine via the driveshaft to the live axle
transmission shaft - rotating shaft that transmits rotary motion from the engine to the differential
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