Yeah, check the ball joints for slop. An easy test is to get another person to sit in the drivers seat while you are kneeling down in front of it. Have them turn the steering left to right and see if the linkages have any play in them. From the pitman arm on down. The arms should move as soon as your friend turns the wheel. If it rotates front to back, that is slop. If it moves after turning the steering wheel is another indicator.
With only a 2 1/2" lift, you should not need to do anything special to the steering componets. I have a 4" lift and the kit came with a dropped pitman arm. I used it becuase it came with the kit. Many others say that it is not necessary.