What to do with Jimbo?

[Heavy Evy]

So I found out today while I had my jimmy on a rack at work that my rearend is blown (to many donuts and trails) I thought I had blown my t case because only front wheel drive worked, I was going to swap in my spare t case but when I turned one of the rear wheels I noticed the other one wasnt moving , I popped the diff cover off and the fluid was metallic in color and the spider gears lay broken at the bottom of pumpkin. So what am I getting at? I'm not sure if its worth it to fix the rearend, I was thinking of doing a 3/4 or 1 ton axle swap because I beat the hell out of it and need to drive it to work and back, give me some advice and tips please because Im not sure what to do yet but I want a stronger set up.