66 C10 rear wheel track narrower than that of the front

[semaj4712]

Hey guys, I was looking at my wifes C10 the other day and thought to myself, man those rear wheels look more narrow than they should. So I got out the old tape measurer and sure enough, the rear wheel track is 4 inches narrower than the front. Which seems pretty crazy different. As far as I can tell the rear end is stock, the wheels are original or original reproductions but some crazy aftermarket wherls or anything. The wheel specs are the same front to back, so why is the rear so much narrower than the front?
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