You can tell by the shape of the tranny pan. Each one has a unique shape. If you post a pic, it would be easy to tell which one. If it's an OD, probably a 200 4r.
Well to start find out if its a 4 speed or 3 speed, that will narrow it down a little then check the shape of the pan. A perfect square is a th350 and a square with one corner angled is a th200.
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