I attached the base tune to this post, that I just downloaded from the PCM.
Do I simply do a segment swap with a 2008 Silverado 5.3L? I can't really find anywhere in the tune where it says the transmission it is setup for. I'm used to the Gen 3 style tuning, so this gen 4 stuff is new to me.
It's running a 2007 4L60E 15 pin
Back story on the PCM.. I took over this project car (LS3 into 1970 Cutlass 442) from a shop that was taking too long. It came with a new harness that was pinned out to work w/ a 4L60E and the PCM has a "PSI Conversions" sticker on it -- which lead me to believe this PCM might already be setup to run the 4L60E. But after downloading the tune, the "ECM Trans Type" is set to "Manual". E38/T42
1970 Cutlass Rev0.hpt