Torque Converter and PCM relationship
I have a 2005 Jeep Grand Cherokee 5.7 with the 545RFE automatic transmission and had been experiencing vibration problems between 40 and 50 mph, which cleared +50 mph and I suspected either a problem with the 4th gear or with the torque converter clutch. I took the car to an automatic transmission specialist, who also suspected the torque converter. The torque converter has been changed and the problem has gone. However, what they are saying is that the signal from PCM does not reach 100%, which is causing the problem to happen in the first place i.e. the wear in the torque converter clutch plate is due to a partial closure signal from the PCM causing the wear and hence vibration. They have said that if I do not replace the PCM, the torque converter will soon fail with the same problem again. As they have quoted me $1,500 for this work in the UAE, I would just like some independent reaffirmation that this sounds technically reasonable before I make this commitment.