Tire Alignment Trouble

My truck pulls to the right.. I will be replacing the tires soon because its been long enough the inside 2-3 inches on each front are worn. I'm worried it could be the knuckle. When I bought the truck used from Toyota of Temecula, it had a bent knuckle which pulled the truck to the right pretty bad and made them fix it and no longer pulled. Later, I got new tires, alignment, and it pulled again. A few months went by and it still pulled but by then the tires had worn a little. I had the alignment shop realign and they said everything was good from the readings on the machine.
If it continues to pull after I get new tires soon, I don't know what I'm going to do. Ive checked the tie rod ends and wheel hubs.
At the risk of most certainly sounding like an moron, can unevenly worn tires cause severe pulling? If new tires do not solve the issue, is there anyway for me to be able to determine if the knuckle is bent?

I also swapped out the tie rods with moog ones about 2 years ago. My short drive to the alignment shop after that swap had my truck look like it was going crosseyed with the front tires. Do you think the shop may not have taken the time to adjust them properly and just fiddled with the a arm bolts? (I'm just guessing because I don't know much about it and don't know what is involved in an alignment)

Any suggestions are appreciated

 

Bad toe settings will more typically result in "squirrlyness" rather than a consistent pull. If the inside edge of BOTH tires are worn significantly, then there are two likely causes; 1) excessive toe-OUT, 2) worn front springs.

YES, badly worn tires can cause a pull.

I'm not sure how a "bent knuckle" would cause a problem that couldn't be corrected by an alignment, as long as the alignment falls within the vehicle's specifications. As far as the knuckle being bent goes, I think they are made of cast iron. In other words, they shouldn't bend -- they crack.

One very important thing to keep in mind: roads slope down to the right in order for rain water to wash OFF of them. If the vehicle is aligned to neutral (on a flat), then the angle of the road will pull you to the right. Most of the time, vehicles are aligned to have a slight pull to the LEFT in order to counteract the natural (gravity) pull to the right, giving you a neutral *feeling* on a typical road that slopes to the right.


I think what you really need to do is this;
1) verify that the front ride height is correct.
2) verify that the front wheel bearings are tight and smooth, if not, replace as needed.
3) verify that the front ball joints are tight and smooth, if not, replace as needed.
4) new tires.
5) alignment by someone COMPETENT.