I am the proud owner of a 2008 Dodge 3500 4x4 6.7 Cummins (Blutec) with the 68rfe 6 spd transmission. For the last few months it will not shift past 4th gear when towing a load....or if you load it by accelleration. If I stop the truck and turn off the ignition the transmission will begin shifting correctly again until I load it up. After doing some research I thought that replacing the solenoid block might correct the problem but it did not. Also ... I should mention that I did a delete about 3 years ago and have a smarty tuner. It has always been set in the economy mode and has seemed to work great. I used the tuner to pull the DTC codes and it show P0700 (MIL Request) Transmission Control Malfunction. Also.... The electronic shift switch on the shift lever quit working about the same time. Does anyone have any ideas? Where is the transmission control module located ...is it internal? Could it be as simple as the that switch being bad and somehow affecting the TCM? Would reprogramming the ECM back to stock affect the TCM?


Sorry ... I'm not much of a mechanic