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Old 08-05-2019, 08:29 PM   #4
AussieinNC
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Join Date: Jun 2017
Location: Cherryville, NC
Posts: 2,158
Re: Hydraboost Noise

10 years on a shelf means the seals have dried up and its bypassing causing the groaning noise....

Put a kit thru it and it will be good....

You can get a kit from

https://swperformanceparts.com/gm-27...CABEgIb0_D_BwE

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