The AVM/Mile Marker Kit is like $150 (Link here
Its simple to do. I did it recently to my truck and I kept the original center caps to keep over them so its incognito (and plan to keep the ones when i get new wheels/tires too)
Unless you Go Solid Axle with Manual hubs, or the Setup from an 01+ ranger (CV's and Hubs) then you'll never been able to 100% lock in hubs AND keep 2wd. The problem with the above described process is that the front driveline is fully turning which would cause some pretty unnecessary wear and add extra mpgs.