Originally Posted by
Shrek
In GM CanBus vehicles (2007+), all of the modules on the communications bus contain the vehicle VIN.
Whether or not tuning software displays a VIN, is a matter of how the particular tuning software is configured, and has nothing to do with how GM originally programmed each module.
In your specific project, after all of the modules are correctly programmed, you can change the VIN in the ECM and TCM (if this is necessary).
The easiest way is likely to find someone with an EFILive interface. Using their Scan Tool, you can change the VIN at no cost (i.e. does not require a tuning licence).