i took my Z in to get 2 new tires and a 4 wheel alignment today. when i went into pick it up the guy said that he couldnt do the alignment because there was a prolbem with the lower ball joints. he didnt say what the prolbem was he jus said he couldnt do it because of them. how hard are these to replace?( i did the front struts not to long ago) and how much would it cost to have the new ones pressed in?