God I dislike drum brakes. Anyhow, with stuck brake I've had decent luck de-adjusting the shoes thru the slot(s) on the backing plate. You'll need a skinny screwdriver or other small diameter device to push the self-adjuster lever off the star wheel and then (hardest part, for me anyway) figure out which way to turn the star wheel. Try to do this with the wheel on and on the ground, easier to rock forward and backward using engine. You probably have to give the drum a few good whacks to free it from the hub. Suggest hitting where the drum lays on the hub versus outside of drum. Actually with the tire off, stands under both sides of the diff, put 4 lugs on, but not all the way, place in gear and hit brakes, might have to use forward and reverse to free it. You'll know by the loud clunk when its it's free. Be careful please