long story short the truck had a bully dog on it when we purchased. it would not uninstall and the tune I pulled off my ECU was not a stock one. I am looking for a stock tune for VIN 1gchk23245f909949 now i did find one that was close to the versions located on the Cal check on TIS but the fuel system and speedometer versions are different. I am still learning on this platform so not sure how much this will matter.I am hoping some one could educate me on how the different versions work and impact on the tune.

One that came off of the truck
Operating System: 15228758
Engine Operation: 15904640
Engine Diagnostics:15879109
Engine: 15879103
Fuel System:15879098
System: 15228743
Speedometer:15233749

The one i found on Diesel Place

Operating System: 15228758
Engine Operation: 15904640
Engine Diagnostics: 15879109
Engine: 15879103
Fuel System: 15879099
System: 15228743
Speedometer: 15233751