I have a good feeling you are correct. When they were investigating the issue, the first thing they did was replace pads, but that did not resolve the issue. The guy that seemed to have the most insight, not the service manager, suggested that he did not believe that brakes were the problem. He focused upon the suspension in everything he did, so I suspect he had information from Ford that that was where he needed to look.

You are correct about what I feel in the steering wheel. It is really a very gentle pull to the wheel, but the truck drifts anyway. Hopefully, the service guys are up to the task. This is generally a good outfit and they do seem to work hard to correct things. All but the service manager anyway.
Randy
>
Several people have had this problem, and Ford has not been
>able to come up with a good (cheap) fix yet. I've heard
>that is caused by a suspension problem, not brakes, tires or
>wheels. Apparently, when you brake hard, the front axle
>winds up slightly; when this occurs the wheels toe left and
>the truck goes left. Since it toes left, you shouldn't feel
>much in the steering wheel, right? If it were a brake, tire
>or wheel pull, you would feel the reaction in the steering
>wheel.
>
>The soft spring bushings allow the front axle to wind up.
>They may have some stiffer bushings out by now, which may
>help.
>
>There is also a brake pull that was caused by mis-matched
>front brake pads; I think there was a bulletin out on that.
>This could cause the brake pull either left or right, and
>you may feel it in the steering wheel. If your brake pads
>cause a left pull, and you have the axle wind up, then it
>will really pull left.
>
>By the way, the NHTSA has a safety investigation on this
>subject; EA01-004. If your pull is real bad and Ford can't
>fix it, you might want to report it to them at:
>www.nhtsa.dot.gov
>If its a real safety problem, they may be able to require
>Ford to recall and fix them.