I am posting this from another thread. I wanted to keep this information together in one thread.
By Brian Diehl: Jim, I'm so glad you were able to actually get down the road and have no engine/transmission problems! Way to go!
I don't think I saw where you mentioned exactly what it was that caused your original transmission ECU to fail. What was the root cause analysis on that?
Brian, I am not exactly sure how the ECU got screwed up. As I approached Raton Pass on the way home from Albuquerque, I made a quick decision to pull over and turn on the misters (charge air cooler issues). For some reason, I kicked the transmission into neutral (a normal process for me at very slow speeds). When I kicked it into neutral, the transmission seem to react strangely. When I went to take off, the transmission did not want to shift. I tried it a couple of more times and after about 4 times, it shifted and we went on down the road. About 100 miles later, the transmission would not shift out of 10th. I nursed it to a rest stop and did a bunch of trouble shooting with my Pro-Link. The results were that the ECU had "failed". That is when I put the replacement ECU on and ran into the gear ratio incompatibility and got to go home behind the hook.
I am not sure if the ECU has gone belly up or if there is a software issue. I have taken it along with the wrong gear ratio ECU to the Eaton rep to have them reprogrammed. My hopes are that the original ECU is not toast.
I still have a hard time understanding how my kicking the transmission out of gear would cause the ECU to "fail"
I will also post this on the thread about the AutoShift problems to keep everything together.
BTW, we just traveled 700 miles and did not have any problems - what is wrong with this picture