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I have never seen one, nor heard of one being factory. At this point if one needed a double axle in the rear, might as well step up to a 550, or better! Just my thoughts though! LOL!
nope, no way no how.
F-superduty came from the factory as a cab chassis. no bed or body on the frame at all. that was put on by the dealer or body shop of your choice.
that "tandem axle" was an aftermarket thing, or a home made thing.
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