RDUKW
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I never completely pinpointed the problem. It was the converter locking in reverse. After a I did a full valve body disassembly and found nothing there I spent a few hours talking to different Allison techs. The final determination was that there was more than likely a crack in the pump area allowing pressure to lock up the trans. I never took the front of the trans apart, I just replaced it. Your truck has quite a bit smaller Alison than the LVS. First place I would check is determine from the Allison manuals where lock up is achieved in the valve body and see if your lucky and just have some contaminates .where you able to figure out what was causing you issue im having the same problem now with my 923