ford 8n right front radius rod assy

hello fellow members:
just wondering if anyone of you out there have experienced this: I have a rather large pin that holds the rod assembly to the front axle and cannot get it to release and come out. I have tried a five ton jack with large socket but so far no movement. I am told that heating it with a torch- might help to release it. I have not used any solvent as of yet, any ideas as how to go about this???
any input appreciated!
thanks, smitty-in arizona