Swapping in the axle will be MUCH easier than trying to do a cab swap. The 80+ frame is about 4" wider than the 79 and older one, meaning you'd have to pretty much custom fab all of your mounts.
The axle will just be spring perches assuming you're talking leaf sprung, much easier in comparison, even if it's a F150 coil setup, it's pretty straightforward to adapt.
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