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Old 06-28-2007, 08:40 AM
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Dangerous Doug Dangerous Doug is offline
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Location: Scotts Valley, CA
Cobra Make, Engine: ERA 289 FIA #2108
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Sure it isn't sound/vibration transfer from the differential or u-joints? I'd climb under and see if there is any excessive play in the differential or u-joints.

What rpm does it usually vibrate at? Can you duplicate the effect with the driveshaft disconnected?

DD
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