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As yellowline stated, it's a ratio of how many revolutions the pinion gear/driveshaft must make to get a full revolution of the ring gear/axles/wheels; all else being equal the higher the ratio, the higher the engine RPM at a given speed.
That is if all else is equal. Did the package on your truck include bigger wheels and/or tires? Larger diameter tires will have the same effect is a higher (lower numerically) gear ratio. As an example; I have a Dodge with the factory installed 20" wheels and tires which runs a (low) 3.93:1 ratio, the same truck with the 17" wheel package runs a (higher) 3.54:1 ratio but actually turns slightly more RPM at a given speed because of the difference in tire diameter.
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