Quote Originally Posted by 2xls1 View Post
FYI changing that setting is for ID purposes only and Does Not change the OS to a Non Computer Automatic calibration or Manual Trans calibration which is what you should be running with a T400.
It absolutely changes it. Switched the setting, reflashed the PCM and all the related codes for the 4L80E no longer being plugged in went away. Its a software switch, similar to the TBI PCMs options. Truck is running low 8s in the 1/8.