I have a 2010 Dodge Ram 2500 6.7l Cummins with a 68rfe transmission. Recently rebuilt due to O/D unit. After rebuild and install the truck fails to remain in gear beyond 150 rpm of output shaft. All line pressures are within 10 psi of desired reading and all sensors have been replaced and tested. I know that over 150rpm the ORC carries the shift to second gear but visually there is no damage or issues with it. Is there anyone who could offer any advice at all?

 

Did you do the rebuild on the transmission? On the early 68RFE transmission there was an extra steel plate or clutch disc the overdrive clutch pack, Or Maybe the problem is with the Overrunning clutch (ORC) which is also a one way clutch bearing.