There are two nuts inside the wheel hub which retain it on the spindle, and a metal plate between the two has tabs bent over to hold the top nut in place. Bend these tabs out of the way. You’ll need a special hub nut socket for a Dana 30 to remove these nuts. When you pull the rotor and wheel hub off, the outer wheel bearing will be loose. Keep a hand over the opening of the wheel hub to catch this bearing.