I have never had so many issues with a customers transmission. Customers truck is a 5.3 with a 4l65e currently. I flashed a completely stock tune into the truck after he swapped the motor. Transmission will be perfectly fine for a few days and then begins slipping and flaring 2-3 shift. I have tried a few different things and compared the file against other stock truck tunes I have and can not seem to figure out what could be going on.
Any help would be great if someone could check out the tune file and see if im just missing something or is it something on his end with the transmission. This is the 3rd one.... first two transmissions were questionable at best from where he got them so there's no telling if the were already trash.
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