I have a 04 blazer zr2 and have had a alignment down and still seems to want to pull to the right. Just wondering what else could be going on. Brake caliper hanging up?

 

I could be a brake hanging up, but I dought that because you would smell the brakes getting hot or smoking. You could have a bad tire. One way to tell is to cross rotate the 2 front tires and see if it pulls left or just goes away.

 

Bad bearing/axle hub assy. Drive for say 30 mins, hop out & feel the rims at the center to see if one is warmer than the other.
Maybe they didn't thouroughly check the front end componants before the alignment?
Low tire pressure or uneven wear?
Even the grade in the road can make a vehicle pull to one side a bit.