KKRT Posted July 3, 2023 Share Posted July 3, 2023 After swapping the Allison in my truck for a manual and reprogramming the truck, speedo blanks out (dashes) and speed dial stops working between 25-30 MPH. I was told that the wiring from speed sensor to ECM is different because the Allison has a TCM. I have been told to compare wiring diagrams and do some rewiring from speed sensor to ECM. Does anyone know this for sure, and can someone provide both wiring diagrams? Quote Link to comment https://www.bigmacktrucks.com/topic/73004-are-the-wiring-diagrams-for-automatic-and-manual-gus-different/ Share on other sites More sharing options...
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