Originally Posted by SailorDon
I forgot to include the rear end ratio in my signature. It is a 3.73 rear end. My F-150 is a 2010 Platinum 5.4 (6 speed transmission).
Oh jeeze, you should pull better than me then! There is either something wrong with you or your truck because you shouldn't even know 4500 pounds is there with 3.73 and the 2010 5.4!
Like rescue said the engine brake works very well, just put it in tow haul mode and drive position. When going down a hill tap your brakes and watch your rpms, it will downshift every time you tap them up to about 4500 rpm or so. This will also work with no trailer but must be in tow haul mode and computer must sense a downward slope. I use it all the time even with no trailer. Once again, it won't work in 3 because 3 locks it in 3 and it no longer automatically shifts. This is very dumb and I'm not sure why they made it this way. In my past experience anything less than drive locked out the top gears and it still shifted normal in the lower gears. This is not the case with this transmission and its probably why you are having so many issues. Next time you drive down a hill put it in tow haul mode and tap your brakes, you will see it in action. Quit shifting to 3 manually and make sure you are in tow haul mode, that's what's screwing you up, I'm sure of it.