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bad harmonic balancer?

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Old 11-02-2012, 05:55 AM
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Car: 86 z28
Engine: 305 l
Transmission: 700r4
Axle/Gears: 383
bad harmonic balancer?

I.m having some vibration in engine while increasing rpms. Its not constant but the virbration seems to "float" can this be a bad balancer? Cause thats all i think. it could be
Old 11-02-2012, 06:32 AM
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Car: 82 Z28
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Re: bad harmonic balancer?

Does it look like this?


Old 11-02-2012, 12:32 PM
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Car: 86 z28
Engine: 305 l
Transmission: 700r4
Axle/Gears: 383
Re: bad harmonic balancer?

Not sure, its still on the crank
Old 11-02-2012, 12:40 PM
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Car: 1984 Trans Am WS6
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Transmission: T56
Axle/Gears: 3.23 LSD
Re: bad harmonic balancer?

Do you have a steel driveshaft? Those are notorious for causing vibrations at high RPM's. The an aluminum one from an RPO code JG1 third gen or an LS1 4th gen is the fix. Both are direct fit though the diameters are different, not sure which is "better", but both are lighter and kill the vibration.
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