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There is no logical reason to twist the Duramax at 2700RPM+ at normal highway speeds, even without the T/C failure issue. BTW when it does fail it takes out the engine (usually rips the pan off) and transmission, just rips the side out. There seems to not be an issue with the 2.73 gears...

BTW you need to ditch those 3.07 gears, seems the T/C front output shaft does not like running with the engine turning 2700+ rpm at 75mph, (multiple failures) I am running the 2.56 gears and turning about 2150RPM at 75MPH which is about 100RPM or so higher than my 2008 GMC C3500HD LTZ with 3.73...

Putting dual alts on the LMM is easy, it already has the mounts or at least most of it

I put two alternators on it and ran dual voltage system, no the AC will not run on 12V, no problem with room for fan You will need to reduce the height unless you want to do a large lift, I did mine with 2" would recommend 3"

https://www.steelsoldiers.com/threads/how-not-to-install-a-duramax-in-a-m998.199340/ I did a M998 but many of the issues will be the same, I was not able to fit the late style fuel tank in this conversion. I just turned 14K and had to "redo" very little. I am by NO means saying this was the...