No codes thrown. Truck just kept running with a slight miss at highways speeds, until it didn't. Last hot afternoon the misfiring came back with a vengeance. Left me on the side of the road. When it cooled down, limped it to a mechanic. Diagnosed crankshaft position sensor. I'm having a Delphi one put in on Monday. Did alittle reading up on that sensor and it can cause the issues that I've been seeing, just like Nitrous said. Also could have been damaged during the Trans install, also like Nitrous said. Will report back after Monday.