Gear box: It is the place where the different "gears" of the cars are located.
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There is a shaft that comes from the engine and then there is another one that comes out of it and goes to the wheels. Through a set of gears, it moves at different speeds even when the engine moves at just one constant speed, so it takes advantage of the engine's power. They may be manual or automatic.
Rear hatch might be closed imperfectly causing the beeping alert sound when in motion. When the sound occurs pay close attention to the diagram of your vehicle on the dsh above the speedometer, this will verify if this is the issue by a flashing red light indicating the hatch is open.
Had an issue with my previous gearbox and I changed it and now when the car in on motion and want to select from gear 1 to gear 2 we feel and hear a heavy vibration with a deep sound. What will be the issue