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The first time I came down a long hill with a very hard curve at the bottom towing my Trailer with the tow/haul mode on I just about sh** my pants. When going into the corner while braking the trans automatically downshifted into second gear and the engine rpms jumped increasing the engine braking. The truck rear tires started sliding initiating a jackknifing situation. I got off the brakes and disengaged the tow/haul mode and got through the corner. No more tow/haul mode for me under those conditions. I manually select my downshifting. I contacted Ford about this and they told me they did have some complaints about this condition and they were looking at it.
I don't know if the newer trucks do this or maybe Ford changed the downshift program to prevent this.
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