ILoveOldJunk

Recently acquired a 21 year old Mule. The previous owner let the brake master cylinder run dry, and when I flushed the brakes, one wheel's brakes locked up. I took the wheel off, but cannot get the axle nut off, and there is not enough space to get my gear puller behind the drum anyway. Anybody had an issue with seized brakes? How can I get this thing off to replace it or rebuild it?