To be clear: I may be wrong about your year, but the on most/all duallys, the hub is "full floating" and the drum wont come off until you remove the axle and bearing retainer nuts.
Yeah, you are right you would need to remove the axle and the bearing retainer nut as they hold the drum/hub on the axle tube. Nothing will go anywhere until you take those off stuck brakes or no stuck brakes. That's the fun of a full floating axle, you have to pull the axle shaft and reset your bearings to even check your brakes.
You will also have to unbolt the emergency brake bracket....forgot about that one before.
Tad
