My lower's on our 93 are riveted on not pressed on , here's a pic of the BJ in question! http://www.oreillyauto.com/site/c/detail/MOO0/K6291.oap?year=1993&make=Chevrolet&model=Blazer&vi=1050714&ck=Search_ball+joint+%26+components_C0317_1050714_800&keyword=ball+joint+%26+components&pt=C0317&ppt=C0106That is how you do the uppers, the lowers are press in. To replace those you'll need to rent a ball joint press from an auto parts store so you can press the old one out and the new one in. Good luck and let us know if you have any more questions