hello all, i am not that savy when it comes to cars. the problem is that i took my tahoe to chevy just for a oil change and checked my car and something seem to be a safety issue. he has showed it to me and i guess he said my, "upper ball joints were loose." so now i have no clue what to do, how much its going to cost me. if someone can help me regarding this i would appreciate it. thank you.