Hello. Has anyone ever heard of someone swapping in a set of M-715 axles into a J-3000? I have a '69 J-truck, and wanted the heavier axles and running gear associated with the 5/4 ton trucks. Plus, if I get a trailer, I want all the wheels the same size. Should I try to just swap the front fenders et al., onto the M-715, and use it's frame or will the axles be sufficient (with the appropriate spring hanger mods?) on my '69? Any help would be appreciated.