humming noise at 70MPH

Feb 12, 2022
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In my 04 I notice a humming noise and slight vibration in the gas pedal (and floor for that matter), when I approach and exceed 70mph. Just had timing belt and water pump done. I don't want to do trial and error fixes if I can avoid it. Is that the 4th gear just working hard? The 04s just had 4 gears.

Is this a tire noise, or something else? It doesn't sound like tires, more up towards the front of the hood.

Any ideas?