Perhaps 2007 was the last year the 1 meg PCM (blue / green connectors) was used?

Perhaps converting to an older 1 meg PCM that has a .xdf is an option?

Perhaps the computer you have is the E38 ECM that is using the T42 TCM for the 4L60E?

Gearhead-efi link for OBD2 tuning information: http://gearhead-efi.com/Fuel-Injecti...2-OBDII-Tuning

dave w