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  1. Allison trans falls out of gear at a stop

    Transmission Shop
    I need help. My 2001 2500 HD has this weird problem and is getting worse. When I stop at a light and 15 seconds later it feels like someone drove into my back bumper,a really strong loud clunk. Also when I roll through a turn and I step on the gas its like in neutral and when the revs come down...