2007 silverado classic 5.3
Posted: Fri Dec 27, 2013 2:21 am
Hello just bought my shinny new trinity. Went to select my truck in the options and can not find 2007 silverado classic. i tried using the avalanche tune for the 5.3 but im not seeing any gains. i modified the tune trying to firm up the shifts but nothing seems to change. Any help or info you be great thank you.