This board has heard of people towing the truck around in gear until it breaks lose, or jacking up the rear wheels, putting it in gear, and rocking the wheels back and forth.
Towing it in gear scares the heck out of me, personally. Just feels like you might do some damage. The wheel rocking idea makes some sense to me, since I've never been comfortable prying on the ring gear with a pry-bar (makes me nervous).
Ultimately, the best advice is, don't be in too big a hurry. Give the lubricants some time to work, keep putting a little pressure on the crank, both directions, from time to time. Maybe three times a day, get in the habit of working on it some. It'll come lose eventually, and your patience will pay off in less damage done.
My two cents, anyway . . .
-Michael
