I've wondered why just about everything I've done so far has seemed like an ordeal. 2001 Ford Expedition here. Just replaced the oil filter adapter gasket, actually, and it was a brutal battle. Oil filter remover wasn't fitting right, lower radiator hose clamp was almost impossible to take off, I had a very tight space to work in. The worse part was actually fitting the gasket in there. What a journey that was.Yeah, contrary to what others say here, these are tough trucks to work on. I'm surprised when I do anything to mine, and it's not a knuckle busting ordeal. I've worked on a lot of tuff cars and motorcycles, but these rank up there. A simple thing like taking off an oil filter, becomes a swearing ordeal. Maybe I'm just getting too old. My first few cars, an early Volkswagen, and Datsun 240z were so easy to get at pretty much everything. Maybe I need to find an old Datsun, and make it my daily driver.
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To OP: I would use pb blaster on the nut like someone else mentioned and make sure the fit is snug. Use a pipe for extra torque if you can. Just don't strip anything. Wish I had more experience with this particular part. Let us know once you get it off. I'm about to do a complete intake gasket installation, so your progress reports will definitely help.