first off--4 hi will get you broken parts unless you have your tranny built to take it--it can also cost you other things---
getblown5.9 is right-----4 lo is where you want to be--you also want the O/D turned off--that means the light on the dash is on saying OD OFF---you don't want your truck shifting into O/D and last but not least D is also where you should be---you want to get the most speed going and you're going to screw yourself out of speed by staying in 2nd gear---
Ammo22 --I think you want your tow/haul mode turned on, but I'm not really familiar with your truck, so a ford guy needs to answer you to be for sure----chris
getblown5.9 is right-----4 lo is where you want to be--you also want the O/D turned off--that means the light on the dash is on saying OD OFF---you don't want your truck shifting into O/D and last but not least D is also where you should be---you want to get the most speed going and you're going to screw yourself out of speed by staying in 2nd gear---
Ammo22 --I think you want your tow/haul mode turned on, but I'm not really familiar with your truck, so a ford guy needs to answer you to be for sure----chris