Ok back on topic, my fault.
The T87 TCM is on parts restriction from GM.
But Ross (meyers, EFILive) was able to get his hands on one, and has successfully read out the calibration from one and flashed one.
Albeit it was an 8L90-calibrated T87, not an Allison calibration. But he was able to read/flash to it. No mapping support, and he hasnt even looked into mapping support yet. But he did say that it is running all-GM software, even though the hardware (Hitachi) is Japanese. Which is a great thing for them, because GM software is what he knows best and has the most experienced with...and from what he has said, is way more logical and easier to work with than foreign software (IE, Bosch on the 2006+ Duramax ECM's).
See, where a controller is designed/made doesnt really have anything to do with how "hard" or "easy" it is to crack. Its all about what software is in it. With any electronic control unit (whether its an ECM or a heated seat module), GM can choose to either write their own OS/software 100% from scratch, or rely on a "base tune/software" from the hardware manufacturer, and then merely tune it to their specification/application.
From my understanding, thats what GM did on the 2006+ Duramax ECM's....Bosch supplies all of the base software, operating system, etc..and then gives GM an EFILive-ish type program that GM can use to write the engine operation calibration and parameters. Kinda like how Microsoft makes Windows, the base operating system, and then other companies write their programs to work on top of the base windows OS.
But when GM does everything 100% from scratch to their specifications, it makes things a lot easier and more logical for Ross to understand, because he has been working with "GM's style" for 10+ years.
Which is a good thing for the T87...he will probably be able to figure it out and break it down comparatively quickly than if it was someone elses' foreign software that was merely just tweaked by GM to work with the 8L90/Allison.
I would assume it was more cost-effective for GM to start using their own controllers for the Allison, rather than relying on Allison for the base TCM hardware...but up until the 8L90, GM didnt have an "in house" transmission controller that was capable of running an Allison...so with the 8L90, they had to design a whole new controller for that, and probably said "hey lets make this thing be able to work for the Allison too, so we dont have to keep buying TCM's from Allison, and only have to stock/support one TCM now for all truck/SUV transmissions, regardless of if its a Hydramatic trans, or an Allison trans".
That doesnt mean Ross wants people to start bugging him about 2015.5+ Allison support though!!!! :rofl:
Just have to be patient.
Ben