I have a mildly modified (TQ reduction, shift points/speeds etc) tune for an 07 classic 2500 HD (6.0/4L80E) with the 248 OS you're welcome to if you want it.
Here you are Jim.
Big Mike, thank you!
~Erik~
2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.