In a gearbox fitted to a front-engine, rear-wheel-drive vehicle, the three shafts are the input shaft, output shaft, and countershaft. The input shaft transmits power from the engine to the gearbox, enabling the transfer of engine torque. The countershaft, which is connected to the gears, facilitates the gear changes and allows for varying torque and speed outputs. Finally, the output shaft delivers the power from the gearbox to the rear wheels, driving the vehicle forward.
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