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shifting problems

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  1. Allison OEM
    2005 LLY / Allison 4WD 155000 miles. Starts fine in Park, but will not shift out of Park when running. Workaround of putting key in ACC and shifting to Neutral then starting works. I'm assuming a neutral safety interlock switch?
  2. Allison OEM
    I have a 2005 LLY/Allison with only 17k original miles. The truck has had a Diablo predator tuner on it at least half it's life. Last few yrs it's been ran on the 85HP tune. Last yr I was driving down the interstate and decided to romp on it and soon as I did it locked it's self in I think 3rd...
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