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just a little back ground info. 2005, deleted 6.0. no tuning good ficm voltage truck ran great, not issues other than a minor case of sticking spool valves that rev-x took care of. Drove truck about 100 mi. home, let it idle while i unloaded gear.(no issues) next morning went to leave, started...

went to pull into my parents drive way and the truck would not move. It acted like it was in 4th, and the tow/haul light started flashing, so i backed up and drive about 1/2 mile to my house and pulled the codes; p0766 and p2703. Trans fluid only has about 3000 mi on it and looks good. after...

Can you test the STC fitting using AE? Have a 2006 6.0 warm or cold start it takes twice as long to start as it should. no codes GP's check fine with AE