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I suspect its a modulator issue that makes these shift hard. I have limited my driving of mine due to hard shift. I did have it out this past weekend and found it to be relatively smooth when transmission is very cold. As she warms, she gets harsh. I plan on bring mine across town to an Allison...

Mines does this-it cant be good. Even throwing it into neutral while still get the harsh down shift. I have spoke to an Allison shop in my area (Mpls-St Paul)-they have a guy experienced with the transmissions in these trucks. Told me that it may be the modulator or possible a spring in the...