My '01 was doing this HARD upshifting/downshifting thing last night for the first time. Freaked me out, especially since my 20 yr daughter home from school for the summer has been driving it lately. All the way from River Forest to St Charles it did this hard shifting thing, usually from second to third and then back down. On the way home, nothing. Not a thing. Back to normal.

Maybe this is a Chicago thing??