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trans codes + slipping in reverse
I haul a large truck camper 24x7. It is around 4k pounds. The truck is a 2001 Lariat LE, DRW, 4x4, 7.3L with a build date of 02/01.
Within the past couple of months, I noticed that when I am on a hill and try to back up, sometimes the truck would roll forward, and I would have to hit the brakes and give it diesel to get it to go backwards up the incline.
Recently, it not only behaves as mentioned above, but it is now slipping(?) out of reverse regardless of the incline. Its like its getting pulses of fuel as it goes backwards and in order to get it to move at all, I have to press the pedal pretty far down. The truck has a hard time going backwards.
A week ago, I was driving on some hilly terrain and my O/D light started flashing. I stopped, turned off the engine and checked the fluid level. When I started it again the light was off. It did seem to choke a little going from first to second the fist time after I started it, but that is the only time I have ever noticed any tranny problems other than reverse.
I went to a shop and had the codes read. P0781: 1-2 shift error and a turbo pressure error. I expected the turbo because I have fuel/oil in my valley.
Now, my plan of action is to service the transmission and see if there are any metal bits and how dirty the fluid is. Is this a waste of time with this error? It hasn't been serviced in at least 20k miles. I would also say that about 1/3 of my driving is on dirt roads. Someone mentioned a possibility of dirt holding one of the valves open....
Next problem: The tranny was replaced by the previous owner. How can I tell which tranny I have? The dipstick saws to use mercon, but all of the write ups say to use mercon V in a 4r100. Which is what I imagine I have.
2001 F350 Lariat LE 7.3L 4x4 Long Bed Crew Cab Dually - Born 02/2001
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