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89 Sierra loud whining-please help

   
Old April 26th, 2012, 11:37 AM
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Default 89 Sierra loud whining-please help
I bought a 1989 GMC sierra SLE a week ago and I have been stumped on it ever since. Its a 350 tbi 5 speed with a six inch lift and 35" mud tires. There is this loud whining while running and I am out of ideas. At first I thought it was the alt bearing, so I swapped alts and its still whining....anyone have any ideas?
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Old April 26th, 2012, 2:51 PM
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Mud tires will do it too I seen a tire get a chip off and screem
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Old April 27th, 2012, 12:26 AM
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Its not my tires, it whines will parked with the engine on. Besides I have run mud tires on every one of my trucks, and I have never had them scream, they do have a fair bit of road whine, but thats due to the aggressive tread.
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Old April 27th, 2012, 9:33 PM
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What about the belts, idlers and or tensioners?
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Old April 27th, 2012, 10:53 PM
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is it a high pitch whine or like a groaning sound
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Old April 27th, 2012, 10:59 PM
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Take the belt off and start it, does it still make the noise?
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Old April 28th, 2012, 5:58 PM
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Its a groaning. I have been driving it to work and it drives fine, which is why im stumped.
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Old April 28th, 2012, 6:04 PM
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could be a bearing for a pulley starting to go
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