I'm about to weld a nut to my transfer case drain plug on my 91. Will need a new one after. Had this happen with the front diff a little while back and mechanics replaced the plug but even that new one seems stuck now too. In a thread about getting these bolts unstuck, someone recommended getting a hex style replacement bolt with a special washer. Is this a Toyota bolt that I can get at the dealer, and if so, what's the part #? If not, where do I get it? And what is the special washer? I'm looking for 3 of them, one for both diffs and one for the transfer case. I don't want to deal with these weird skinny flat drain bolts anymore.
Get a new one in the 10mm hex style, and a new special crush washer.