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Old 06-13-2013, 12:31 PM
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Sbc vibration

Hi everyone I have a sbc 388 stroker with a th350 transmission and a 28-3200 b&m hole shot converter, I'm getting a bad sqeeking noise and vibration under my car. The faster I go the louder it gets, I'm not sure if the fly wheel is cracked or the converter is out of balance, if you let it idle and look under the car at the converter looks straight as a arrow .when you drive the car it feels like the cars going to fall apart .before I start ripping this thing apart any suggestions would be appreciated . Thank you

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Old 06-13-2013, 03:06 PM
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Do you have the right flex plate?
Is your stroker internally or more likely externally balanced?
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Old 06-13-2013, 04:23 PM
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Some stroker kits are external -one end , internal the other .
dave
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Old 06-13-2013, 08:17 PM
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It is externally balanced, this issue just happen this year when I took the car out for the first time. Thanks for the replys
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Old 06-13-2013, 08:32 PM
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Could it be something in the trans , the trans was rebuilt 2 years age but only has under 1000 miles on it.
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Old 06-13-2013, 09:14 PM
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If it only does it going down the road, check the u-joints in the driveshaft. If one is bad it can make it out of balance by letting the u-joint work to one side. Another indication of a bad u-joint is squeaking like you described.
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Old 06-14-2013, 09:13 AM
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It's makes the noise in park to, when you really give it gas it sounds like something's banging by the flex plate
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Old 06-14-2013, 02:48 PM
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Check for loose torque converter to flexplate bolts, and loose flexplate to crank bolts.
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Old 06-14-2013, 05:08 PM
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If you are using a 400 crank you must use the 400 balancer and flex plate. Loose convertor or flexplate bolts usually will give you a knocking sound. I would still check the torque on those.
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