The other day I got on the highway and after was already up to speed I went to accelerate and noticed that RPM increased before any speed increase. There was a Code 1740 present. I replaced the OD and TCC solenoids, No change. I decided to do a little more testing which confirmed my suspicion that it was the TCC. I found a couple of really good articles (links at the bottom) which led me to drill my cooler line check valve, no change, then to bypass the coolers all together, no change.
I have an ATSG book but the troubleshooting it has focuses on the gov pressure issues. I checked line pressure at idle, it is 90 PSI which is high according to the ATSG book. This trans had been gone through 8 or so years ago so I'm guessing line pressure was adjusted at that time. I don't see anyplace to check TCC pressure which would be the next thing I would like to see. I would like to check everything possible before I pull the trans. I do see that the 48re has the TCC circuit connected to the forward clutch circuit which is interesting but not sure if that is of any significance.
740/1740 Codes and Chrysler Converter Flow - Transmission Digest
46-47RH/RE Cooler and Converter Flow - Transmission Digest
I have an ATSG book but the troubleshooting it has focuses on the gov pressure issues. I checked line pressure at idle, it is 90 PSI which is high according to the ATSG book. This trans had been gone through 8 or so years ago so I'm guessing line pressure was adjusted at that time. I don't see anyplace to check TCC pressure which would be the next thing I would like to see. I would like to check everything possible before I pull the trans. I do see that the 48re has the TCC circuit connected to the forward clutch circuit which is interesting but not sure if that is of any significance.
740/1740 Codes and Chrysler Converter Flow - Transmission Digest
46-47RH/RE Cooler and Converter Flow - Transmission Digest