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Ok, need help, 2005C5500 with 6.6 / Allison. Flat bed with 203,000 miles. Stock engine tune.. After 10 miles or so after coming to stop trans codes when shifting to second gear. Po847, Changed D solinoid, internal and external filter, Transend fluid.. Nex test drive coded po847 and

Po768. Connector out of rear transmission does have trans fluid in it. Any ideas, Thanks in advance.
 

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