Tannon, if all you are doing is swapping the frame and the cab and running gear being swapped to it, should not be an issue. How often are these numbers checked unless crossing state lines? It is then akin to using a door or a grille off another car, just as long as you can get proof the truck itself is not hot to begin with. If it isn't, don't sell it across state lines unless the cab numbers and VIN on the dash are good, along with a good title, nothing else will need to be checked. As a third thing, is there a VIN on the frame I am not aware of? When I changed my Dakota frame, although I didn't look, I didn't see anything jump out at me, either.