transmission codes

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    allison transmission Codes P0729, P0735, P02723

    I have a 2006 Duramax with the Allison in it. I got a call from the shop today that the transmission had the codes P0729, P0735 and P2723. I ran it for the first 80,000 miles and one of my salesmen has taken it to 120,000. What caused a 5th and 6th gear sync problem on a non chipped stock...
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