I have been running a tune from an 01 Tahoe with DBW and a 4l80e segment for a while now. PCM bricked and I bought a reman PCM that was from a 2002 Escalade with OS 12209203. I am trying to find a compatible OS to do a segment swap to 4l80e. I was running an 01 OS prior and there were lots of options for a segment swap. I cant for the life of me find a file with 4l80e for this OS. If there isn't an option available for this would it be possible to put a different OS on this to have the capability to run a 4l80e. I am assuming that I cant go backwards and flash my 01 OS on a 02? Thanks in advance for any help.