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  1. T

    Allison 6 speed issues.

    His post on the Allison was what brought me to the forum after doing some searching. I actually sent him a pm. Hate to hear he’s dealing with health issues. Appreciate it though!
  2. T

    Allison 6 speed issues.

    2007 classic gmc sierra duramax. Truck has reverse as normal. As soon as it’s shifted into drive it goes into shift range inhibited. I’ve tried a different tcm. Replaced the internal harness due to leaking into the plug. Gone through the entire harness. The truck will move forward if the harness...
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