Once you start tearing things a part, you will start finding crap you didn't know was wrong. If there's nothing wrong with the axles themselves why swap them? Unless you plan on modifying the vehicle heavily for offroad use you DO NOT need lockers period, they just add to the growing number of things that will lead to other things getting broke and more money to repair. Just use common sense when you are offroad on trails, don't drive through crap that you shouldn't be in in the first place. I used to take my 84 ford ranger 4x2 hunting on some pretty nasty roads and was often laughed at, but asked how the hell did you get here by guys in modified 4x4's.
If I were you I'd keep it as is, don't be doing all of the lift kits, engine swaps, axle swaps etc. that everyone on here tries to shove at everyone. These older trucks are getting harder and harder to find, and are more often looked at if they're stock rather than modified.
My 84 Bronco 2 has tons of issues, but I think I may be getting close to the end of the major mechanical stuff, now more or less onto the body rust issues if I only knew how to do metal work as all the shops around are telling me its not worth fixing which just makes me sad when they say crap like that. I think that if its repaired the right way you wouldn't be able to tell, and at 30 years old, things are going to go wrong no matter what you do. If I had the money to restore my bronco 2 I would leave it completely stock, and stock colors as well.
Just take your time, and do repairs over time, don't try to jump into it all at once because it will quickly get you going in so many different directions that things will get screwed up, you'll get frustrated and do something stupid like sell it. (Kind of like what happened with my 84 Ford Ranger 4x2. I got frustrated with the engine problems I sold it for $700, guy who bought it replaced the TFI module and well as far as I know is still driving it. Like I said take your time, plan everything out before jumping in. Once you get it done you will look back and realize what all you accomplished and will have a great vehicle to show off to everyone.
So a couple days ago I installed a different carburetor on my B2, got it somewhat adjusted and drove it to work, it ran like crap the whole way LOL, got home after work and did more adjusting and its running much better. Now to get my oil leaks fixed, and find out WTF the knocking noise is under load. Can't be something engine related as I can sit in the driveway in neutral and rev the engine and there's no knocking, just from stop up to cruising speed. It went away for a while after doing a bunch of adjustments on the other carburetor but then it was idling way too high.
Anyhow, keep with the project, I was tossing around the idea of either scrapping the B2, or seeing about selling it somehow and finding a small car but either way I wouldn't get crap for it because of the body rust and interior being gutted. Don't give up, even if you have to let it set for a while then go back to it.
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. The interior can wait I haven't really decided on how I want it, I really don't want carpet in it but don't want the bear metal either. The headliner I have an idea what I want to do there, but don't want to tackle any interior stuff until I get the rust problems fixed. I got it running pretty good and plan on putting a manual choke on it here in the near future as the electric choke crap I've never cared for and has never worked right on either my 84 ranger or this 84 B2. 
