My tranny was workin fine since I put in my new TC but this afternoon as i pulled out to go around a truck on the road doin bout 20 mile/hr it decided to stay in 3rd gear lockup and just about stalled the truck! From there it went downhill to the point now where i only got 1st gear and my edge pulls up no codes and niether does the key trick! i quick went to town and got a tranny output speed sensor but that didnt change anything. whats the next thing i should try?

go here and read my article. http://articles.mopar1973man.com/general-cummins/39-transmission-systems/257-automatic-transmission-diagnostic-chart sounds like you have sticking valves