I would like to replace the OS in my Escalade 6l80 with the Corvette tune to allow for tap shifting without a BCM. I see 24249179 OS files for a Holden commodore and a CTS-V on tunefiledepot.com but I think those still require a BCM for tap shifting? Using EFIlive 8.2.1 I was able to replace the OS from my 2007 Escalade TCM to the 2007 Corvette OS on tunefiledepot, but it seems you need the same OS when applying a full tune to these TCMs.

I did just update my version of 7.5.6 to 7.5.7 built 170, so I need to also double check if that somehow allows a full tune over a different OS. There is a 2009 Corvette tune listed on tunefiledepot but its OS 24251030. there is a 2008 tune with 24243170 as well.

Thank You!