noun
gearbox; gear box
A mechanical component that houses gears, used in vehicles and machinery to transmit power and change speed or torque.
この車のギアボックスは5速マニュアルです。
This car's gearbox is a 5-speed manual.
ギアボックスから異音がするので点検してもらった。
I had the gearbox inspected because it was making a strange noise.