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Very similar event happened to mine. Lost 4th then Rev. I found the vent lines clogged with insect debris. Pressure builds up and 4 slips and down hill from there. Need to get the trans on the bench.

Best thing to do is read up on your equipment. The Allison transmission in the A3 deuce is a pretty common unit utilized in a lot of vehicles, especially school buses. It most likely is a mod. 1545, it may be a 55. Get under the truck and record the data plate info. They are easily repaired if...