I have a 00'' Cougar 2.5 V6 for the past month or so the front end has been vibrating like crazy, i purchased new tires and had them balanced. But the front end still vibrates really bad. What could it be? It also vibrates more when you turn, or makes a "humming" noise when you go over a smooth dip in the road. I''m totally lost on what it might be.

warped rotors and/or shot wheel bearings... or worn out CV joints. (was that year front wheel drive?) Shot lower ball joints. loose tie rod ends. I''m leaning towards the bearings though.