Eastern KY to Williamsburg VA - MOUNTAINS?

I wasn't sure about the lock out either until the otherday. Then I reread the owner's manual for my F150. It says if you have Select Shift you can while the truck is in either regular overdrive, or in Tow Haul mode, used the +/- toggle switch on the side of the gear shift lever to lock out gears. For example, if you're in Tow Haul mode, if you hit the - side of the toggle switch just once, then 6th gear is locked out. At that poing no matter how fast your are going, the transmission will go no higher than 5th gear. Click it again and 5th gear is locked out, adn 4th gear is the highest gear available.

Now if you pull the gear shift level to the M position, then you must toggle the switch on the side of the gear shift lever to manually change gears. The truck stay in the gear selected manually by the +/- switch.

flguppie wrote:
Thanks again for the continued advice.

So I can assume that I will be OK to leave it in D (drive) as I crest the uphill part and begin the decent. It will already have the tow haul engaged. I always travel with it in tow haul as it changes the shift points and keeps the truck from going in and out of overdrive (6th gear) at every small grade or big overpass.

Randall, I'm not sure about a lockout on the tow haul. What I have is a on/off button on the end of the shift lever that simply allows the transmission to change shift points as needed. It also provides some engine brake when you hit the brakes going down hill.....you can hear the RPM increase and the transmission providing additional resistance to the downhill momentum.