Originally Posted by
lakingslayer
Take the older OS# stock file and load it in the tune tool. Then load the modified tune of the same (older) OS# (using the "load alternate calibration for comparison" )as the alternate. Next go to "Edit" and select "Create Script". This will generate a script of the differences between the stock file and the modified file of the same OS. Now load the new OS file with the GM updates in the tune program and run the script you generated from the old OS. This should put all the modified changes from the old OS into the new OS.