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Wondering if anyone knows the answer to my question ? So, I am aware that in a 2006 - 2007 GMC / Chevy C4500 C5500 TopKick Kodiak you can replace and reprogram (with a TECH2 and maybe other software etc...) the TCM with a 2008 2wd or 4wd VIN# and you'll go from a 5 speed to a 6 speed...