Need Auto Transmission for '91 Mirage

I'm looking for a cheap transmission for my 1991 Mitsubishi Mirage 1.5L 4spd automatic. The overdrive went out in it a couple months ago and it's now stuck in third gear:mad:. I love this car and don't know what's wrong with it exactly but my husband told me to look for another transmission. If any one has one or knows where I can get one for cheap I'd appreciate the info.

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