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After i read the ecm there is no transmission options did i do something wrong or do you not get to change anything on trans side?

Thats what I needed to know thanks

It is a 2014 Chevy Silverado 5.3l 4wd with a 6l80 transmission and i only want to change transmission settings like lock up. Thsats all the info I have currently.

I want to tune only the trans not the engine. Do i have to do ecm or tcm or both? I dont have the vehicle currently just wondering how many credits this is gonna take?