2005 Ford Escape What's going on here?

So I had problems with my '05 Ford escape not sensing it was in park and therefore wouldn't release the key from the ignition but recently as I was driving without any noise whatsoever it acted as though I bumped it into neutral. No matter what gear you put it in (reverse, drive, etc) it sits there like it's in neutral. Now I checked my transmission fluid and it was clear and red and checked to make sure a seal or something wasn't broken. Had it towed and the mechanic "thinks" it might be the torque converter. Does anyone have any ideas as to what might be wrong?