The term GEARBOX, FOR SHORT can be solved by two different crossword solutions: TRAN (4 letters) and TRANS (5 letters). GEARBOX is a mechanical device used to change the speed or direction of a motor or vehicle. It is usually composed of several gears and other components, and is used in many types of machinery, including cars, trucks, and bicycles. The term GEARBOX, FOR SHORT is often used as an abbreviation for the full term, which is typically used in engineering and automotive contexts.