does anyone have a os for 1220288 for 4l80e swap from a 4l60
does anyone have a os for 1220288 for 4l80e swap from a 4l60
That's not a stock OS, so you probably will not find one.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
I think he's just missing a digit. Open a support ticket, we can probably help you out.
It doesn't have to be perfect, it just needs to be done in two weeks...
A wise man once said "google it"