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Old 01-22-2012, 06:10 PM   #1
Join Date: Jan 2012
Posts: 1
knocking noise underneath

I have a 1999 sierra and when I accelarate the knocking reduces. When I reach cruizing speed the knocking gets louder. If I take my foot off the gas or press down the clutch the knocks gets louder. At 45mph the knocking is accompanied by a whooble. The knocking sounds like it is under the drivers seat or behind it. Nothing looks loose under there. Any ideas?

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Old 01-22-2012, 08:17 PM   #2
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Mine did that and it was the throw out bearing

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Old 01-22-2012, 08:22 PM   #3
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What the hell is a Sierra?!? And a whooble for that matter?
Violence may not be the answer but it sure cuts down on the stupid questions
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