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    Allison 5sp: 03 Allison nutreuls out?

    Anyone ever experience a hard 2-1 downshift and trans data shows shift commanded and current shift going to 0? It is a totally random occurrence nothing I do can make it do it. It's not just a firm shift it's a bang into gear kind of shift. Bought truck with a bad trans, had a stage 5 Ppe done...