Front over drive for a pred, is when you roll you can drive to the marshall
For a CAT SX its an undersized pulley so the front wheels drive faster than the rear. What that does is the oposite to what you might think, it tends to encourage the front wheels to spin up making the car feel less aggressive and safe.... that is from my experience. But on high grip carpet I could be wrong & it is more likely to do what is expected.
Chris