Figure out what you have for an axle first, the front. Ford never ran a 60 front in 1980, they did in 77.5-79 then they picked them up in late 85.
Yes even in the F-350 during those bastard years got the TTB50,
ask your self how many 80-84 F-350's did or do you see none, they never took off like Chevy or Dodge did.
So like Joe was pointing out, you might have a late 80's axle that will need to have the springs outboard on the frame, these newer year axles will have NON neck down shafts and larger 9/16" lug nuts and a very short side tube.
The 77.8-79 ( or commonly called the 78-79 ) will be a bolt in for a YJ, but have factory neck down shafts and smaller 1/2" studs. what ever axle you have its a great start.
Now for the rear, ford never used a 60 rear in there 4x4 trucks during the 80's, 70's yes but not as commen as the sterling 10.25. The 78-79 used them in F-250's and the F-350 got the 70, in fact that's the only difference from the 250 to the 350 and one extra leaf spring in the rear from all the trucks ive seen go threw my yard.
But the front 60 stayed the same and even some snow fighters I had they had 3.55's but all the camper specials all had 4.10 that ive seen.
Rear is not as important to figure out as a front other than if its a small bearing rear 60 with wimpy 1 3/8" shafts, but what ever 60 front your golden.
Welcome to piece of mind