Unlockking

Mike, please tell me you have found the root cause. I am in the same boat. I just recently changed replaced my transmission and everything you listed above including EGR. TC drove good for all of 20 minutes and 3 gears continue to be an issue.

On my TC I replaced the transmission with a rebuild and it's been a mystery. The TC shifts from 1,2 flawlessly then come 3rd which is a hard shift. I replaced EGR and notice a big difference and almost though I had fixed the issue. Wrong.As I drive more it begins to slip into 3rd and eventually it will get " stuck on e". I've come to the conclusion it's not the transmission but rather electronic components or multiple component. TBH Overall replacing transmission was needed but now I stumped too.