I am doing a 4L80E swap in my 2007 Silverado NNBS. From another thread I found the "2008 Express Van with 4.8L" comes stock with the 4L80E so I downloaded that file from the repository. Inside the tune I find the TCM OS ID: 24239927. My TCM is OS ID 24239036. Using the compare log function I simply did a "copy over all differences" on the transmission tree.
My question is, will this work? Assuming I re-pin the trans connector and add the ISS sensor wiring, is there any reason that I'd need to write the entire T42 OS from the newer Express van OS ?
Edit: My ECM OS ID: 12614088