2004 Ford Taurus transmission hard shift from 1st to 2nd. What are the possible causes?

2004 Ford Taurus transmission hard shift from 1st to 2nd. What are the possible causes?
Added (1). Should i replace the VSS / speed sensor, change the tranny fluid and filter or change the valve body. Please replay only if you fixed the problem similar to mind and state what exactly did you do to correct the issue. Please it does not help me and other is you guess a solution. Please only state the exact fix that worked for you.

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