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Author Topic: vibration with my 306 94gtdrop New Member Member # 7203 posted                              I just had a repair shop shop install my rebuilt 306 in my 94 gt and it runs great except it really vibrates the shifter past like 4000 rpm the motor was out of a 90 so the shop changed the fly wheel and balancer does it matter what oz the flywheel and balancer is as long as they are the same? shifter vibrates even in neutral when i rev it past 4000 thanx Radical Rob 94gtdrop Posts: 2 | From: UC | Registered: Nov 2006  |  : PopTheHood ¯ Member # 7040 posted                              yes it does matter. 306's are usualy ballanced with 50oz flywheel and balancer. same as stock. 331's come with 28oz parts. if its the stock crank then it takes a 50 oz. Posts: 185 | Registered: Sep 2006  |  : OneBadHatch ¯ Member # 970 posted                                 harmonic balancer sounds like to me, note he said the flywheel was the same...hopefully meaning same oz as stock, if you have the right flywheel check the rubber on the harmonic balancer and see if the outer ring is coming loose at all [ January 28, 2007, 08:49 PM: Message edited by: OneBadHatch ] -------------------- 1990 GT TFS Intake and Cam AFR 165's Plus all the goodies Posts: 834 | From: Oceanside, CA | Registered: Mar 2002  |  :

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