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International Automotive Technicians Network
Re: 2005 Sierra Bad Vibration 60z70mph
Posted to Technical Discussion Forum on 11/25/2019

Sounds like it might be "beaming" vibration. I don't have SI, but crew cabs around that time had a shake on smooth roads, the fix was a special body mount in the left rear position.

Found a picture [2006 GMC Sierra 1500 SL, photo]

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