The T87A controller modification service will allow you to use the aftermarket tuning suite of your choice (Does not work with HPTuners) to modify your T87A equipped 2017+ L5P Duramax with Allison 6 Speed Transmission.
This is a service performed on your original TCM with a 1-2 business day turnaround.
You will receive your original TCM back!
You will not have to perform an immobilizer relearn or any other relearn operations before you reinstall the TCM in your vehicle.
The TCM operating system and calibrations are not modified in any way from OEM stock, and retain the original OEM CVN's.