I am having the 6L80 in a customers 2013 5.3 Silverado 1500 rebuilt. I did a full read on the ecm, tcm prior to pulling the transmission. I have not applied any credits to license this VIN yet.
Can I just write the original OS back to the TCM instead of hauling it to a dealer? This should be a blank TCM, rebuilt transmission going back into the truck it was removed from.