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2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900

problems help please!!!!

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Old Mar 15, 2010 | 5:04 PM
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isrummell
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Default problems help please!!!!
my truck has a loud rattle/knock when i hammer it off the line. it doesnt do it if i take off easy, and it wont do it of i spin tires til it grabs. any help please
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Old Mar 15, 2010 | 5:09 PM
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Hi isrummell,

Welcome to the Chevy Forums.

Well, assuming it's the '98 1500 ("C" or "K"?), when the cat goes bad it sorta sounds like a bag of hammers.

What's the mileage on this bad boy?
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Old Mar 15, 2010 | 5:10 PM
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I think you got some play in the rearend... Is everything tight back there? I know it sounds dumb, but is the spare tire up all the way and tight?
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Old Mar 15, 2010 | 5:11 PM
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i dont have the spare tire or a cat
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Old Mar 15, 2010 | 5:12 PM
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U-joints, or rearend play. In my opinion.
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Old Mar 15, 2010 | 5:20 PM
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Did you eliminate the catalytic converter(s) when you went to DE? How do you get it through state emissions inspection?
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Old Mar 15, 2010 | 5:21 PM
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the u joints are tight. we dont have inspections
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Old Mar 15, 2010 | 5:37 PM
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Does it have a different Gear set in it then stock? If so might have been shimmed out wrong and you have to much backlash.
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Old Mar 15, 2010 | 5:42 PM
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its been fine until last fall when i put 3/4 ton leaf springs on it
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Old Mar 15, 2010 | 5:43 PM
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Originally Posted by isrummell
my truck has a loud rattle/knock when i hammer it off the line. it doesnt do it if i take off easy, and it wont do it of i spin tires til it grabs. any help please

how about we start here... where does the noise sound like it is coming from?
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