Well, here are the culprits.
"A" and "B" are the shift solenoids. each comes on for a different shift, and then both come on for the final shift. Neither one of them made a difference when I changed them.
The other 2 are PWM (that might not be the correct term)downshift solenoids. I don't know which one it was, because I changed both after changing the shift solenoids separately, putting it back together and driving it around the block.
One of those were bad. It shifts perfectly now.
I didn't see any trash in the pan, but did notice that the plastic inserts in the flow passage and 2 aluminum o-rings were slightly oblong. It could have been me that caused it when taking apart, so I changed them along with a new filter when I re-installed the valve body.
All told I spent less than $90 for parts including the filter and new fluid. I did have to re-stock the beer fridge of the friend that let me use his shop and lift, but that was well worth the money.
Hopefully this will help some of you if you run into this, and don't want to go the transmission shop route. Nothing against those guys, but I think most times a rebuild is just a easy (expensive) fix for a small problem.
Ironically, I put it in the GMC dealership's shop yesterday for a recall on the spare tire release mechanism, and for them to fix the 3rd brakelight (this will be the 4th one they have installed) and they called me yesterday telling me a should do a "90K mile service" on it, which should include changing all fluids and flushing the transmission.......
WB
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