Anyone had these symptoms with a 904?

Thanks Craig, I very well may need to holler at you.

Past that, just another update:

Yesterday, I went for another drive down the street and back just to see whether or not letting it sit a few days "fixed" it, lol. It did not.

In fact, things went from bad to much worse in the space of a mile. I turned around half a mile out, started back. It hung in 1st again, then went directly to third. However, this time third started slipping. I eased it back home and by the time I got down my driveway, it no longer pulled in any forward range, either in drive or selecting manually. Reverse was sort of there but slipped. I went inside, came back out a few hours later, tried again and it dropped into gear just fine. So, I lost everything when it got hot, then got everything back when it cooled off.

In all seriousness, I know this might be pretty bad and I'm just documenting stuff for fun because I've NEVER seen a transmission develop so many symptoms, so severely, so rapidly. What the heck? Behind a slant six? I'm definitely going to pull the pan and look for a filter problem. The only problem with that angle is if the filter is stopped up...what with? Pieces of the kickdown band? That's my guess based on the noise I kept hearing. I'll update when i get it cracked open.