1 Yes it does, but you are better off performing a complete transmission flush with a T-IV fluid.
2. Around 3.2 quarts.
3. A JWS3309 or T-IV type fluid. If you shop around, many Toyota dealers sell T-IV for around $5/qt. This is the only OEM approved fluid available. There are also multi-vehicle fluids that have been bench and field tested extensively by Lubrizol that are also T-IV compatible. Some of these multi-vehicle fluids are also full synthetic. However, take note that these multi-vehicle fluids are not OEM approved as T-IV is considered to be a proprietary formulation and no licensing program exists.