Same thing happened on my dad's 300sd. We couldn't find the vibration anywhere. When whe finally found the missing bolts and tightened them up the vibration was gone.http://www.peachparts.com/shopforum/showthread.php?t=156974&highlight=jimdbrr

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"spreading a trail of obnoxious where ever we go"
1981 300sd w/ 341,500 miles

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