[monkeylizard]

OK, as promised here are the results. Dealership replaced both TCC and PCS. Reading between the lines on the notes on my paperwork, this fixed the hard shifting, but not the hesitation or "chuggle" as they called it. They disconnected the battery cables and let it sit overnight. apparently they found this trick in a GM bulletin. It will cause the TCC to reset and start functioning properly.

Everything is great now. If the hard shifting hadn't started, I probably would not have needed any parts at all, just an overnight with no battery. Anyone else with the hesitation problem might want to give this a try before paying $$ for tranny work.