I recently bought a new set of tires and noticed not long after that my xterra was pulling slightly to the rigth hand side. So I took the truck to the dealer and they adjusted my alignment, however now when I go over 60 mph the truck begins to shake. I just noticed on my bill from the dealer that when they fixed the alignment they flipped my two front tires for no apparent reason. I am very annoyed by this and now have to go back to the dealer so they can find out why my truck now shakes when i go over 60. any ideas would be appreciated

The most likely source of the vibration - as you didn't have it before getting new tires....is a bad balancing job, or a bad ply in a new tire, etc.

Take it back, again, and have them also rebalance the tires.

Or a weight dropped off. I have at times had those sticky weights fall off. You could have thrown one making it out of balance. If so these things just happen. I just had all four of my tires replaced and they gouged all four wheels putting them on. They are getting me a new set but now I have to go back and wait for them to remoount and balance them. I'm not to happy either.

well I just got home fromt the dealer, when they took the car for a test ride they felt it and rebalanced my tires. However after driving it I really dont fell much of a difference. They couldn't find anything else wrong so I am out of answers.