For the sake of documentation;
I called a dealer parts department. Mitsubishi made a 27.5mm and a 28mm Circlip for the Inner Shaft. They now only have the 28mm and it's $3.05 in a wharehouse in Atlanta.

I pushed my shaft & circlip back in. I have "emergency" 4x4, but I'm not counting on it. I found a couple 8" front rears close by and I'll get one in a couple days.

I plowed last night in 2wd with a 50gl drum of water in the back (as usual) and it was ok but slow reversing and generally sucks compared to 4x4. My driveway's getting smaller and smaller because I can't push the piles back into the woods. I can't wait to fix it!