On my car I had to take the slides apart and grease them.
IIRC it is quite a chore to separate the seat adjustment mechanism from the car frame and the seat frame. It's been several years since I did it, so I don't recall exactly how I did it, but it is possible. After all, Ford put those parts together, so they have to come apart somehow.I can't figure out how to remove the adjusting mechanism. I removed the 8 square head bolts and the two bolts that secure the adjusting mechanism and the seat frame lifts a little until the adjusting mechanism won't allow it to lift any more.