I have ARB lockers. It came with the truck I was lucky. Anyway I am so spoiled because of them I could not imagin going off road with out them. I can climb steper hills and go through deeper mud than any typical 4 wheel drive anything. If I ever got another Bronco and it did not have lockers on it. That would be the first upgrade.

 

The ARB is a neat idea, but I dont like air lines that can get damaged. I got a powertrax in the back and it works perfect with out me doing anything. On road, it hardly ever locks and off road it locks right away. In the front I have a lock right which is good off road, but locks too much on road. Its good thing I have locking hubs.