I have a 2000 Cougar with 46000 original miles. It`s making a rumbling sound starting at 50MPH and up. When I turn to the right it lessens, when I turn to the left it makes no difference in sound.
My guess is, the tires have uneven wear, probably in the front. Block the back wheels, put on the parking brake. Jack up the front -- one wheel should do. Turn on the engine. You may need to shift to Drive. With the wheel spinning, touch it with the shaft of a screwdriver, just to see if it is round.
If the tire is not round, the problem can be wheel alignment and/or shock absorbers. Fix that and get new tires.
Hope this helps.
There are several places to look. If it is a lower pitch vibration, look into front wheel bearings and rear axle bearings. A bad u-joint will produce a higher pitched vibration and may lessen as you lift the throttle. They also will give a hi-low squeak when backing up.
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