Recently in Nov 13, I bought my first F-150 S crew 4x4, a used 2010 Lariat with 60K. After a few days driving it, found several issues with steering pull and vibrations at higher speeds.
The dealer promised to make it right and after having the truck for 2 days, they found a few things and repairs and parts etc were done. Even a rebalance of the tires. Shop stated there is no issues with alignment.
The vibration is now gone but there is still a random mild pull to the left, that is, it steers fine for the most part on a newer smooth paved road. On older roads that have some wearing groves from age it tends to wander mostly left but on occasion, to the right.
Lately this seems to be getting worse in that it has a minor pull back and forth, most prominent on worn pavement where there is worn tracks, but still mostly favoring the left.
If alignment was out, would it not pull to one side consistently? Especially when it seems fine on new pavement.
Maybe the tires? They are new Pirelli's and maybe that is the issue but swap from side to side didn't help. Keep hearing these tires suck....(noisey too)
Or is overall poor steering an inherent issue with these trucks?
No play in the steering and I would hope the steering parts aren't worn out already.
Love the truck but the steering leaves a bit to be desired....

 

Must have got that one in 50 million produced with this problem. Sad, have to back to Gm truck since they steer nice.

 

put some decent tires on it...

 

Running stock rims? did someone change the rims changing the offset? Also what size of tires? I have my play truck with big tires and it will grab the wear marks and groves in the road really bad and pull me in every direction. Yet i can put on my shinnies and it will drive perfect down the road

 

They are the stock 20" rims with the cheap plastic chrome covers (Lariat) with stock sized 275/55 tires. Tried rotating and side to side with no change.
It's funny that it steers so similar to the 70's Fords with the sloppy twin I beam set up

 

It could be that it just has light steering and the tires are following the curvature of the road. It shouldn't be so light that it follows very minor crowns though. I bought a new 2010 Lariat 4x4 that did the same thing...to an extreme level. After a few of alignments within 2 weeks of purchase and a Ford service rep getting involved, the dealer decided to offer me another truck.

The service tech that rode with me after the 3rd alignment told me he thought it was a bad steering pump. According to him, Ford had a bad batch in 2006 and this was the first that he had seen since that time. Whatever it was, they were very interested in getting this truck back and getting me into another one. They obviously found something wrong that they did not want to get out. The truck I have now has tighter steering but I find that it will still follow the road curvature to a certain degree but nowhere near like the 1st one.

You may want to have the dealer check the hydraulic pump. I believe 2011 is when Ford went to electric steering on the F150's.

 

Is the suspension stock and have any components been replaced on suspension?Sounds like memory steer to me. Caused by ball joints, tie rod ends ect that are replaced and over torqued. Can also be caused by stiff ball joints. My Excursion had this problem(very common), ball joints had no play but were overly stiff causing the steering to not self center itself. Google memory steer.

An alignment only shop could probably pinpoint the problem as it's not a spec issue but a component creating drag.