I'm not so sure parts swapping is the answer. The tag is clearly a GM tag and has the numbers on it that I mentioned. One thing seems to fairly clear, the 8625 was never intended for use with a 4L80e. Did the dealers have the ability to create tags to put on the ECMs?
That does bring up another question. As far as the ECM is concerned do the 4L80e and 4L60e look the same to it?
That certainly looks to be a more viable approach at this point.I think a good plan going forward would be use a '7427 PCM. I also think it would be a good plan to use an original 7.4 Liter Memcal.
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