Well, that depends on what you mean by "bad"... . I have a somewhat 'bad' ball joint on my passenger side, but when I flex it with a digging bar, it only makes a small bump noise and doesnt move hardly at all. . about 1/16" deflection, but i`m no alignment guy. . if you can move the tire up and down with that side jacked up in the air, then i`d say you have a problem. First thing you`d prolly see is the death wobble. . at 50mph, I wouldnt want to experience that. wheres talledega? more than a 500mi trip? hard to say if its worth the risk, depending on the condition of your ball joints and your courage. . heh. .
jus my 2c. .
-j