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Does the noise change with the RPM under the load ( transmission engaged ) ?
Mine does that and is 100 % fuel pump ,
I also reed someone have noise from oil pump .
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Mine does not change at all. If you downshift into 5th or 6th it still does it, and also does it going up hill or coasting downhill. On mine the peak sound is centered around 80mph and you can just barely hear it at 75 and 85. It basically screws up any travel where the speed limit is 70 or 75 because the flow of traffic is centered on 80.
I'd describe it as a higher pitched howl or a lower pitched whine.