In my experience with the slow speed ABS activation on the Tribute I have ALWAYS found that one of the front reluctor wheels was cracked on the axle. If you jack the vehicle up and look inside the front wheel you will see a toothed ring that is around the end of the axle. Look VERY carefully at this ring while turning the axle, you will find that one or maybe both have a crack in the ring. You will notice the crack because 2 of the teeth will be further apart than the others. Use a bright flashlight to help you find the broken ring. Once you figure our which axle has the broken ring you will need to replace the axle. I have not found a manufacturer for only the ring.