99 Taurus transmission issues

I have a 99 taurus that seems a bit jummpy between 1 and 2 gear. best way to describe it is i can fill the car catch hard when it shifts. all othe gears are fine. obviously this is a transmission issue. Is this somethng that if caught soon (just started this week) I can get fixed or is a symptom of needing a new transmision?

When was the last time the automatic transmission fluid was changed?