Hello, I'll try to keep this short and to the point. I own a 04 Ram 2500, SBQC, 5.9L 24v, 4x4 Automatic with 250k+mi. on it , Sunday morning I went on a drive and noticed that the transmission was not shifting into over drive, all the other gears seem to work fine though. I checked the fluid level and it was at proper level it also looked clean as well. I had a friend hook up a scanner to it and check for any silent DTC's and got nothing. He then checked APPS readings because I changed it 2 weeks ago and he advised that I calibrated the new APPS within the required tolerances so it was not that. We then took the truck for a drive while he read the scanner and he said that all was operating normally from the ECM side, OD command was being sent to the transmission but the transmission was not responding to the command, I drove the truck up to 60mph and TCC would lock up as well but no OD. I have never had to deal with a faulty auto transmission so I have been doing some research to see what might cause this. What I have found is that it may be one of or a combination of the following, pressure transducer, pressure solenoid, TCC/OD solenoid group or the TCC/OD group wire harness. I just wanted to run it buy the 48re gurus here and see if there is anything I might be overlooking also if there is a proper way to diagnose the items I listed without dropping the oil pan.  Based on the write-ups I have seen changing the parts that I listed is pretty straight forward so I feel I can do it myself if there are no other possible culprits. Thank you all for your time.

 

Edwin H.

Edited January 29, 201510 yr by Ed's5.9

Sounds good, thank you!

Update: I reached out to 98whitelighning, he had good words to say about Inline performance and so did the staff at Goerend. I dropped off the truck early last month and got it back a couple weeks ago and it is running great! The Goerend components work as good as everyone said they would and the guys at Inline Performance did a great job in putting it all together they where straight forward and provided great communication even though the shop was about 5hrs away from me.They will be highly recommended by me in the future.