This.The ABS may be perfectly fine. If all four wheels lock at the same time, the car will slide. ABS functions by reading a difference in wheel speed. No difference, no engagement. The system has no way to tell if the car is physically moving and the wheels are not, it sees the wheels at the same speed and behaves normally.
Again, Khan, Ford never, ever made 2WABS on the Taurus. It was 4W or 0W ABS.
Do you have drums or discs on the back of your 99 fct?