i have a 95 civic dx and when i got new tires on my car they told me i need a new axle and a new balljoint. i knew that i needed a new axle, but i didnt know about the balljoint. i think when the mechanic replaced my axle on that side of the car(the other axle) he might have messed it up. now i know where the balljoint is and have a rough idea on how to replace it, but my question is what does it do and what happens if i dont replace it?