Swapping a 5.3 out of 2009 Tahoe into an older truck running the old style non electronic manual transmission. I am keeping the 2009 computer, fly by wire throttle, Having a custom harness made by Tech Rods I know I have to disable VATS and post cat oxygen sensor. What other problems does anyone see that I may run into. I need to put together at least a base program to get it running and tune from there. I looked around the forum for a post about swapping engines and didn't see much.