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High pitched whining at high rpm's (autos crank really high on the freeway) could be anything from a bad transmission bearing, alternator bearing, water pump, bad engine bearing, damaged cam journal, or even just the tires. unless the car is shaking, there's not much you can do to find the sound. And if it is a bad engine bearing, not much you could do without a rebuild. Just check the basics like alternator, water pump, and all that good stuff, and if those are good, fu@# it, leave it, lol.
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