The required fluid type is almost always stamped directly on the metal transmission dipstick.
Which does it have (e.g., 6.2L Gas, 6.7L PowerStroke)? Are you doing a simple drain or a full system flush ? what kind of transmission fluid does a ford f250 take
To give you the most accurate capacity and part number, could you tell me: What is the of your F-250? The required fluid type is almost always stamped