Well, I buttoned it up today. New filter from Napa, and I used the rest of my BG ATF and a can of BG ATC+ to give it it's best shot.
It drives in first and reverse with no slipping, but hesitates going into second and will not shift into third or fourth at all.
I checked the TV cable adjustment and it looks good to my eyes. Held the tab, pushed the jacket all the way back, then went to WOT.
Was worth a shot. I'll do some saving while I get the rest of the truck back together and have a rebuild done.