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Old 09-30-2013, 09:52 AM
TransEngineer TransEngineer is offline
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Does this happen in one particular gear (like always on the 2-3 upshift), or does it happen during multiple shifts? If it happens on multiple shifts (but always at the same engine speed range), then I'd suspect it's something engine- or engine accessory-related. Sometimes you might have a metal line (A/C line, cooler line, etc.) that resonates at a certain engine RPM, so you get a brief "ring" when the engine passes through that speed. Or maybe a heat shield or some other piece of sheet metal, likewise resonating at a certain engine speed. Or maybe an accessory drive belt (fan belt, serpentine belt) that resonates / shakes at a certain engine speed, causing it to briefly touch some nearby sheet metal piece. Any loose belts?
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