willaim, welcome to my world......some baots are built "tighter" than others. I have the smae issues under my dash with a 10w6. I've got abtout 90% of the vibration away by using a dynomat type material (offbrand I found at walmart, works the same) I took off the dash and made a seal aroufn the back of the dash and screwed it back on, you coudl also use that spray foam in a can to seal things up. first try and find out what is vibrating?
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