I have a 2012 Chevy Express van 2500 with a 4.8l motor and 6l90 transmission with 200k miles. I bought a used 6l90 with 77k miles from a junk yard, that came out of an identically van. Same year, 2500, same motor, same transmission, etc. Should I need/have to reflash the tcm for it to work correctly after install?
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