Yes, get a new O2. You can get generic ones pretty cheap, just try to get one with the same number of wires for best results.
I've never rebuilt a transmission myself, but a friend of mine builds high performance ones and it's not as easy as just slipping gears on and off. Get a factory service manual if you want to go that route so you know all the tolerances, lash, etc. You'll also have to find out if the gears are compatible, though I would guess they are.
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