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Reduction in gear ratio form one gear to another such as a rear axle ring & pinion gear allows each component to complete revolutions per minute at different speeds in relation to one another. this can allow more power from an engine to be transmitted for example to the drive shaft as the drive shaft turns faster - thus turning the pinion gear faster than the ring gear that it meshes to in the rear axle assembly so the engine speed then turns the ring gear at at different rate - inturn the wheels of a truck turn at a slower rate then the drive shaft that is attached to the pinion gear - so the truck can rev the engine and the gear ratio allows the gears turning engine in relation to truck axle at different speeds to use more power to be sent to the axle & truck wheels.

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