i know the uppity Broncos came with auto lockers installed from the factory. You have a D44-TTB in your truck right now. It's what your front axle is, those other numbers are just different sizes of axles, i *think* the D35 is a jeep axle and the D60 is a Chevy Axle.
Auto-lockers fail when you need them most, or when you least expect it. You'll run into a situation where you're driving down the highway and the right front auto-locker fails and tries to lock the tire, giving enormous pull in the wheel and making the truck near undriveable. Or you'll shift into 4 hi to start wheeling and it won't lock, which creates many more issues. Just about no one maintains them correctly, and even if they do, they're still prone to fail.
You do have to get out and lock the hubs, but they will lock and unlock when they are supposed to. There are other options to Warn, but i have had the best luck and longevity out of my Warn Premiums with their lifetime warranty.