If the vibration increases with RPM and is not specific to a particular gear, or comes in at a specific RPM despite the gear, I would check the fan clutch. Mine went out at about 100k and caused the whole driveline and motor to shake. Too me a while to find it... just a suggestion.
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87 GT
Full exhaust, K&N, KB Subs, BBK STB, homeade dumps...
87 Taurus
New York
Winters Bite!
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