rookie might have said:
['86 2wd cab to 4wd frame swap]
I did the earlier generation: a '8x 2wd cab onto a '78 4wd frame.
In my case I had the choice of lifting the cab (Ewwww) or cutting
out the driveline hump from the 2wd and bolting in the lifted
hump from the 4wd cab. I did the latter with no problems, and
very few saw blades. A good torch and a steady hand might go quicker,
Once old cab is off, check the mounts, eh? Being cheap I welded in
the biggest galvanised washers I could get and didn't replace mounts.