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  1. usaflagwaver

    Allison 5sp: Allison trans problem on 2004-3500

    HELP!!! Got a P0708 code from my 2004 3500. Reads..."transmission range sensor circuit high output". Whats wrong with my truck? Only shifts up to 3rd gear. Is this a big deal, whats the fix? Only got 300k on this eng/trans, can't be bad yet, right? :confused:
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