It was posted at gmauthority and another site I found searching for a 10 speed allison. I couldn't find ANYTHING for a 10 speed allison other than the tc10, then I found a press release where they quoted allison branded instead of allison built. It went into detail saying it was a GM design, will be built entirely by GM, but was certified by Allison. Pretty sure it was the gmauthority site where a few speculated it was the 10r140 in a thread with the press release about it being allison branded. I'll try and see if I can find it again.
An excerpt from one article directly from Allison.
Allison Transmission published a press release on December 4th, 2018 that states the following about the new 10-speed automatic transmission, “The Allison branded automatic transmission, manufactured by General Motors, …” The press release also mentions “new Allison 10-speed, tested and validated in partnership with Allison Transmission”.
https://www.tfltruck.com/2018/12/2020-chevy-silverado-hd-allison-transmission/
http://gmauthority.com/blog/2018/12...ison-transmission-isnt-really-an-allison/amp/
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