I have a 68 coupe and have been experiencing screeching noises coming from the underside area of the car and for the life of me cannot figure out what it is or where it's coming from. The noise is very prominent when traveling at a higher speed (freeway driving). I have checked the wheels, brakes, and even changed out the speedometer cable, but no luck so far. Has anyone ever experienced this problem and if so what it could be???

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