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  1. K

    Trouble with built Allison 5 speed slamming into reverse

    Few thousand miles. All new fluid when it was overhauled.
  2. K

    Trouble with built Allison 5 speed slamming into reverse

    When my transmission gets to operating temp it has a 2-3 sec delay before it engages into reverse then jerks/grabs really hard making an awful clunk etc if the truck is cold it shifts normal and smooth. All other gears etc shift just fine as they should. absolutely no codes so I was wandering if...