Update - After my morning hunt, I started working on the Pioneer. Pulled the brake pads out all together, rotated the spindle, and - exact same noise. Put the pads and tire back on, lowered it, checked the diff fluid - could not see any. Pics attached. On my way Up North, I stopped at the dealer in Gaylord and bought 1 bottle (8 oz), and it took the whole bottle without coming through the opening. Tested for noise - Exact same noise. So, now I'm figuring the front diff is trashed. After 8 full ounces, it still isn't full.
When I took it in to the dealer I bought it from for a "noise in the front end" concern a couple months back, they couldn't find anything, I drove it around their parking lot, and I could not get it to replicate. They said they checked all the fluids, and everything was good. I might try to the 2x4 procedure tomorrow between the morning and afternoon hunts, but I really think I'd be wasting my time. I do think I'll take it to the dealer in Gaylord, as it's 45 minutes away instead of 4.5 hours. If it's a warranty job at this point, it shouldn't matter. They are backed up 1 month out from the day you drop it off. I'm so disgusted with this machine right now, I don't want to ride in it. It will suck not having the plow for my driveway, though.
Side note - even the guys in the dealer who listened to my video said it sounded like rocks between the pad and rotor.
Chris