I have just completed a swap on a 2008 Sierra . Removed the 5.3 and 4l80 and replaced it with a ly6 6.0 and 4l80. I used the adapter harness from ICT Billet and have everything running.
So this is my question. I see the only gen 4 6.0/4l80 combos were in 08 and 09 express vans. I cannot find a file in the repository that matches my OS. What are my options? My ecu os is 12617631 and my tcu os is 24239927. Any ideas? Thank you.