Like the title says I have read tons of posts and believe I understand I can unlock and tune only the engine portion and since the tcm is separate I don't need to send it off to be unlocked? I just didn't see a definitive answer but several that lead me to believe this is ok.
This is a 2017 Sierra 6.2 8 speed, What I have read just getting the ecm tune cleaned up some will improve the transmission shifts anyway. Will I still see gains in drivability only tuning the engine and skipping the trans tuning?
Thanks
Dave