The 6.0L and trans in my truck have been great so far. Recently noticed a change when trans goes from 2nd to 3rd gear. Sometimes it jerks more than it shifts. This is both cold or at operating temp. I don't shift it manually unless towing a camper (5800lb) which I don't do often. It is at 76000 and change and the maintenance schedule does not yet call for transmission service. But I am scheduling it just the same - will have fluid flushed and filter changed. Hopefully that will take care of it. Anyone else had this? No codes of any kind by the way.