Correct answer
The crown wheel and pinion final drive.
The crown wheel and pinion final drive. Their tooth ratio provides a fixed reduction and increases transmitted torque; in this layout it also changes the direction of rotation. The gearbox selects different ratios, while the final-drive ratio does not change when another gear is selected. Universal joints transmit rotation across changing angles, and the differential allows the wheels to turn at different speeds when cornering.
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The propeller shaft’s universal joints.
The crown wheel and pinion final drive.
The differential’s side and planet gears, as though they were another selectable gearbox.
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