Originally Posted by GMC-2002-Dmax I have a "Magic TCM" file, A40 like the early 2001 OS was. You mean one that has dumber learning and shifts a lot better? I think I might know which one you're referring to.
2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison12.9s @ 108 mph many thanks to Ross and Paul
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