Help with grinding/whirring sound!

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SquareRoot

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Arizona
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Mike
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85
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K20
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350
@SquareRoot, did you have this problem also? If so I am hoping you found the issue because I am stumped.
No but it's probably bearings somewhere in the drivetrain. Wheel, Axle or carrier. Do you have a 2 piece driveshaft? Also check brake drums for worn and out of round. Metal contracts when cool, expands when hot.
 

77firstsquarebody

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Tennessee
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Justin
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1977
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GMC C25
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350 V8
Turns out the noise was coming from the speedometer cable. I took it out and added some cable lube and the noise is gone.
 
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