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    Allison 5sp: Codes set P0847 & P0872

    Mike, Ok...here's more info. The transmission is stock with 167,000 miles and the pan has never been off of it so the internal filter is the original. The truck has mostly been a daily driver but has seen some occasional towing and has had the Diablo Sport Predator towing tune for most of its...
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    Allison 5sp: Codes set P0847 & P0872

    Mike, What should I be looking for when I drop the pan besides the electrical connections? Darrell
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    Allison 5sp: Codes set P0847 & P0872

    The fluid looked a little dirty to me and filter magnet had a good collection of material on it. The fluid was/is Transynd and looks a little darker than I thought it should be.
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    Allison 5sp: Codes set P0847 & P0872

    I changed the fluid and spin on filter in my truck and after the truck was started the transmission made a clunk and the service engine soon light came on. Tranny is in limp mode. Checked for codes and found P0847 & P0872 were both present. Reset the codes and restarted the truck and put...