That's a simple swap between the two, you will need one special tool (Dana 44 wheel bearing lock nut socket), enough tools to take off tires, a pair of channel lock pliers and a magnet.
For the auto hub truck take the tire off, pull the hub off if it didn't come off with the tire, find the notch in the threads of the spindle, put the magnet where the notch and the lock nut meet, now wiggle the lock nut back and forth with the channel locks and pull out on the magnet (a strong magnet is best), the lock key should come with the magnet. After that screw the lock nut off. To reinstall on the other, set the preload on the wheel bearings, find the nearest notch in the lock nut that lines up with the notch in the hub, insert the key, put the plastic cams in place and reassemble.
On the manual hub version, pull off tire and hub, now you'll see two lock nuts with a washer between them, stick the socket on a breaker bar and on the outer nut, break that loose (it'll take a bit, spec is near 200ftlb) and take it off, then pull the washer, and pull the inner nut. Reinstall in reverse order. The inner nut is the one with the nub in it for the washer, make sure it is on the washer side, set preload on the wheel bearings, install washer so the pin lines up with a hole while it's notch is in the notch in the spindle, flip if necessary, then install the outer nut, basically tighten as much as you can, like I said spec is near 200ftlb...