I've had my 7.3 for around 18 years now. Back in 2003 the dealer flashed the PCM because it kept blowing transmissions. They said it was the same code as what they ran in the Excursions. It felt like I lost power after that. What is the best OEM program for my? The truck only has around 160k on it. I do 3500 mile oil changes. I run an Air Dog, OEM upgraded extreme duty air cleaner, ATS turbo ported intake, TS Performance 4 position chip and ATS stage 4 trans.