Noun
the shell (metal casing) in which a train of gears is sealed
Source: WordNetgear-box
Both HMMWV copies rely heavily on imported U.S.-made parts, including the chassis, gear box, and diesel engine. Source: Internet
This can be a traditional gear box, coaxial planetary gears or a transmission with belts or chains. Source: Internet
Put the stuff in it that I lost because it is a manual gear box. Source: Internet
These work superbly with the Tamiya dual gear box. Source: Internet