Join Date: Feb 2004
Location: St Peters, Missouri
Bikes: Rans Rockst (Retro rocket) Rans Enduro Sport (Retro racket) Catrike 559, Merin Bear Valley (beater bike).
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Without looking at your bike, my guess is that you have a bent derailleur hanger. That's fairly common and the fact that your old derailleur was broken makes me suspect a bent hanger even more.
Shift into a gear that makes the arm on your derailleur point straight down. Now stand your bike up against something and go around to the back of the bike. From the back, your derailleur arm should point straight down. If it's pointing toward the wheel, bend it back straight (you can probably do it with just your hands) and see how it works.