2002 Dakota Sport 4.7 45rfe 270k miles
Only in OD it Started acting like it was going into neutral when above 45/50 mph and if going up hills the Rpm would bounce up and down a few hundred. If it acts like it’s in neutral it will jerk hard back into gear. And if it does it so many times it goes limp and throws a p0734. But if I clear it and turn OD off it switches all gears smooth. Ive changed fluid and filters and it was reddish colored like normal but had an odd smell to it. Changing fluids did not alter anything and it still does it. Valve body and accumulator plate doesn’t seem to have any damage. And no shreds of metal. There was a fine metal powder on the magnet but I figured this was normal? Something electrical? Something mechanical? If any more info needed let me know please and thanks.

 

OD-Off should only disable fourth and Fifth gear. I don't have an FSM handy that includes the 5th gear TCM flash programming. I think it also forces second prime instead of regular second, but not positive on that.

 

 

Have you done any work to the trans previously? Changed gears, or tire size? That code is whining about incorrect gear ratio........ which is just odd. Slipping clutches???

 

 

Then either the O/D solenoid is bad, sticks, or something else is jammed up somewhere. If it just freewheels in what should be O/D, that would explain the code...... No clue how to diagnose that one.....

 

Since Third and Limp are functional, that rules out the overdrive solenoid in a sense (or so I'd think). I'd be looking more at the 4C solenoid. I don't know if there is a way to force second prime to test the 4C clutch.