Join Date: Jul 2008
Location: Grid Reference, SK
Bikes: I never learned to ride a bike. It is my deepest shame.
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Your shifters likely have a little dial or knob that, when turned, switches between indexed (click shifting) and friction (no click). If you just want to get the bike on the road, any rear derailleur will work, and will work fine with any cassette or freewheel. Te only thing that might be a little tough is finding a rear wheel with 126mm spacing.. might be tough, but I have not looked for one so I don't know.
Go to your LBS and see what they have for wheels, tires, tubes, etc. they have in stock. You can almost certainly get everything you need in one stop.
Keep in mind that a brand new trek 1000 (or whatever they call their entry level road bike now) will probably cost you $800 or less, so don't throw too much money at the cop-auction bike.