Re: engine vibration
40 mph was where the heavy vibration began on our coupe. It was still there after replacing spindle bolts, bearings and bushings.
How old are your tires? Have you checked the wheel and tire run outs? Our tires were 15 year old Firestones. A new set of American Classic radials and tire beads cured the issue.
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"It ain't what you know for certain that gets ya in trouble. It's what ya know for certain that just ain't so!" 
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