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Issue resolved. See initial post.

FWIW Here is my OG tune for the old transmission if anyone wants to take a look and see if they can see anything that I cannot.

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Thank you sir for your assistance. I wish I would have done more research beforehand, it seems the 06 TBSS T42 is complicated. I tried segment swapping and it led to other issues and I dont have...

I am still having an issue with my gear indicator. VCM scanner tells me the correct PRNDL position but my dash indicator is stuck in first. Also not kicking down or unlocking converter at WOT or high...

Thanks for the insight. I was curious whether the OS needed to match but I could not find any information to confirm. I will try this.

*Update* This worked. Gotta fix some things to get the...

[FIXED] Reverted wiring at trans plug, and installed PCMofNC harness, re-flashed the old tune with modified tables and DTCs as directed by PCMofNC;
the swap works as intended.

It seems that,...