Update and new problem...
I just wanted to let everyone know what I found since I thought it was interesting and I learned a good lesson from it.
When this all started I had the SES light on and I found a P0106 (MAP Sensor poor performance) code showing. The hard downshift started at roughly the same time. I made the mistake of jumping to conclusions and assumed I had a trans problem and decided that I needed to get that fixed first. Wrong move. Since the code showed up first I should have gone ahead and fixed it first. Turned out that by the time I got around to looking at it I also had P0101 and P0107 codes as well. I took it to a local guy (only one I could find with the right scanner) and we found out that the Baro sensor was out of range. Unplugged it, cleaned the contacts on the connection and that was the fix. Runs fine, no codes, trans downshifts like before.
Happy ending, right? Not really. I drove the truck home and discovered that during the 2 - 1 downshift the transmission sometimes (1 in 4 times) seems to "neutral out." It seems stuck between shifts like none of the clutches are engaged. If you give it just a little throttle and bring the pump pressure up it bangs into low.
I talked to Mike L. and know what I need to rebuild it and based on what he said about not messing with it, my question is, is there anything I can do to get through a few thousand miles until I'm in a position to rebuild it?
BTW: I never did reset the TAPS since the baro fixed the first problem. I didn't want to screw with it since it was working. Think I should still do that?
Thanks everybody. You've all been a lot of help and I've been learning quite a bit.