Upper and lowers usually references ball joints, inners and outer for tie rod ends.
There may be reduced labor for doing both sides, but ask. If not I would wait until I had to myself.
Usually warning signs such as vibration, clunking wobbling may surface ahead of time, sometimes without warning. It happened to me 25 years ago or so.
SPONSORED LINKS
Monday, May 5th, 2008 AT 5:14 PM