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Hi
I am working on this GMC SIERRA 2005 LLY. Upgrades = Allison 1000 transmission, supermax turbo, full bore driver side exhaust manifold, x flow 5" turbo back exhaust system without cat. ext....

Thank you that worked, and there was no problem writing a new calibration in high speed.

I am trying, I will let you know in about 30 min.

Hi
I am new at this, and is working on a 2005 GMC Sierra 6,6 LLY. It has the Allison 1000 transmission and converter, Super Max turbo, lift pump, aux diesel filter, x-flow exhaust system, upgrade...