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    Allison 6sp: 06 duramax

    I have an 06 2500 HD Silverado, diesel, Allison trans. When I shift from "D" to "M" the indicator doesn't move. When I shift from "M" to "1", the indicator will then move from "D" to "1". Never indicating that it went though "M". It does the same thing on the way back from "1" into drive...
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