Here is a way to check to see if you have bad ball joints or tie rod ends.....
1) Shut off the air ride in the trunk.
2) Jack up the front of the car (jack the entire front up so you can check both sides).
3) Place your hands at the 12 and 6 o'clock positions on the tire/wheel and then push/pull on the tire/wheel to see if there is any movement. A VERY little is fine, but if it is sloppy, or there is alot of play the ball joints are bad. The more play you have in one direction or the other will determine if you have upper/lower ball joint problems.
4) Place your hands at the 3 and 9 o'clock positions and perform the same procedure as above. This will determine the tie rod ends. The only problem with tie rod ends it could be inner or the outer. You will hafta be watching the tie rod ends to determine if it is the inner or the outer. Me personally I replace both the inner/outer at the same time, if either are bad....but that is just me....no reason to hafta do the front end alignment more than once for bad parts.
That is how I check them.