Transmission Locks wheels
So, I am driving my 2003 F250 pulling a 18ft trailer with a tractor on it (total weight about 9500 lbs) when I notice the tachometer go high and the tranny seems to quit pulling. Suddenly the tranny grabs in 1st and the tires lock up for a second. Before I can stop, it does it again. I managed to get off the road and stop before it does it again. I can go in reverse but not forward. I also notice the coolant temp is high but the trans temp is normal.
I check the fluid and it barely touches the bottom of the dip stick. So I get a friend to come get the trailer/tractor and I go in search of tranny fluid (the truck runs fine with no extra weight). This is when I discovered the you can't get Mercon SP or LV from your regular parts house.
So the next day I go to my local Ford dealer and tell them the story. They tell me it's a bad fuel injector. Huh?? What about the low trans fluid? I ask about a heated fluid change and he tells me the 2003 model does not have a thermal unit so it does not need a heated change and I should not do this as it could flush out "grit" that is helping the gears shift. SO I get 3 quarts if tranny fluid and pour in 2 to get the fluid to the right level and no trouble since.
What do y'all think happened? Just low fluid for the weight I was pulling? Why did the coolant temp peak but not the trans.? Does the 2003 have a internal thermostat on the tranny?