Had front end rebuilt about a year ago and an alignment at the same time. Alignment tech claimed pulling was due to worn tires. Tires were worn, but i just put new tires on this week, but it still pulls to the right. My question is this; What causes a vehicle to pull if tires are good and brakes are not dragging. I would think if the alignment was out, it would pull either way or be loose feeling.

 

Have you inspected the radius arm bushings for wear?

 

Has leaf springs. Radius arms used on F150 and Bronco.

 

You had an aliment done with worn tires?

Get a tape measure and verify the toe is set to an 1/8". Measure up from the ground equally in front and in back of the tires (as high as you can get but same front/back), measurement in front should be 1/8" less then in the back.

If not correct it, test drive in between setting changes to verify the steering wheel is straight and the truck tracks straight down the road. You should be able to let go of the wheel on a long straight flat stretch (pick a road without excessive amount of crown), it should very slowly drifting off to the right in the end. Not wandering and not pulling.

If any item suffers from wear, play in a tie rod for example replace it first or attempts to correct will be futile.

Make sure you drive straight forward for a short distance before taking measurements.

 

So toe in or out would make it only pull one direction. This truck pulls to right no matter the road or parking lot. I can be on the left side (British style) and it still pulls slightly to the right. I will check the toe in/out, but I still wonder why only pulls to the right?

 

Toe in will not cause a pull. Swap your front tires size to zixe to be sure it's not them. Edit: Swap side to side

 

Toe won't cause a pull point is to make sure it has toe and the proper amount of it.

zero toe can cause a pull, toe out can cause a pull one side or the other being the dominate tire causes a pull. Makes truck want to go right for example, you pull wheel left to make up for it.

Much more to an aliment then just toe however if tires stand the way they should, lean out just a tad at the top normal ride height, then checking the toe be best bet to correct for the pull.

I use a tape measure on my trucks to set toe, do so after replacing wear items such as tie rod ends/ball joints etc as it often changes things. Neither one pulls to one side as resetting toe corrects for it. They run straight down the road and with my hand off the wheel, do so near as long as the road runs straight. And neither one tears its front tire/s up, if one or both suffer uneven wear and fast its a sure sign things are not right pull or no pull.
Sounds like your front end was adjusted to worn tires (surprised the shop would even consider aligning a front end with worn tires on it, most shops would simply refuse to do so) checking its toe is a quick and easy test to see if that is all, or at least part of the problem.

If you have worn steering components? doing anything before replacing them is a waste of time. A single worn part could cause a pull.

 

Caster is the alignment angle that causes pulls. Do you happen to have a printout of the alignment from when the front end was rebuilt? Did they replace the caster/camber bushings when they did the alignment?
99% of pulls I have run into are tire related. (I did alignments for a living for 20 years). I know your tires are new, but swap them side to side anyways, see how it drives.

 

Caster also causes the front wheels to auto "return to center" after making a turn by simply letting go of the wheel.
Not disputing there is much more to an alignment then toe setting. No toe and or toe out can cause a pull or a wander either one.

Merely suggesting the OP check and then properly set the toe if its found to be off, it was set based on worn tires. I've corrected for a pull and more then once by doing nothing more then that, properly set the toe. Yea ride height has to be normal, if suspect other issues just by looking at it its front wheels, sagging suspension tires leaning in etc then no the toe setting alone is a waste of time.

To correct toe setting if needed, takes a little time to do it and get it right. Then if pull is gone keep an eye on tires to make sure they are wearing evenly.
If it doesn't automatically return to center after a turn? showing signs going to tear a tire up? yes it has bigger problems, time to get it on a rack have caster/camber checked/set.

And no it wouldn't hurt to swap tires, see what if any difference it makes. Tires are new so shouldn't make a difference. Possible to have a bad one won't know until swap them around to see.