'02 Tahoe high speed rumble

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jwebber40

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I just bought an '02 Tahoe with 152k miles on it. I noticed on the highway that it has a humming and vibration at between 70 and 80. It is not there at speeds less that 70, or at speeds over 80. From 70 to 80 is pretty nasty! Can anyone give me any ideas what might cause this?
 
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