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I ended up doing the COS upgrade on the "confirmed good" segment swap, then did the segment swap again into the tune I started with. It works like it should! Now I can get back to actually tuning it!...

When you add GM.PRNDSW, you get GM.TFPSW as well as GM.PNPSW (an in-gear flag that never changes in my case).

Looks like I messed something up with my segment swap. I re-did the segment swap to...

Well I started with the original segment swapped tunes, and GM.TFPSW reads the correct shifter position. It shifts up when it is supposed to hold 1st. When it shifts, GM.GEAR reads 2, GM.TFPSW reads...

Exactly. I guess it would only take about 15mph to get a 1>2 shift to figure out if that's the issue. I'll see what I can do and report back.

I would have to source a 1 bar MAP to do that wouldn't I? Maybe I can just idle it to check commanded gear or TFP switch status...

The car is a 5.3/4L80e that was running on a HPT custom OS that was a combo similar to mine. I don't know what the tune looked like, but the transmission shifted fine.

Now I swapped over to a...

Here's my car. I'm mainly just trying to see if I can post ;)
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Car is a 5.3/4L80e. I had it running on someone else's ECM with an HPTuners custom OS. No idea what that tune looked like, but the transmission worked like it should.

I swapped the ECM to a fresh...