It's built into EFI Live if your in a Cummins tune file but not for the Duramax's
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that I do know. I got the timing calculator for the lb7-lmm trucks
Here is the Josh H Calculator I tweaked and threw together real fast that includes the LML. I cant guarantee its perfect as I made this almost 2 years ago and haven't touched it since. But its the only one I know of in existence.
Attachment 19327
Send me email of timing calculator for 2009 GMC Sierra thanks
Thanks,,