C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

89 Vette vibration

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Old Sep 21, 2004 | 10:31 AM
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mitcher
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Default 89 Vette vibration

Hello!

I intend to buy a 89 Vette here in Spain and want to thank you all the help that you have done. Now I know some important things to check it well before paying!

However, I still have a doubt about the vivration of the car. The last owner told me that, at high speed, the car vibrated a lot. Then replaced some parts and vibration was greatly decreased... but still existed. The guy visited the Vette factory again, but a mechanical told him that, for a car of this power, it is normal a minimum vibration.

Must I believe him?

Thank you all again! Naturally, I will be very grateful for any other advice to check well the car before buying it!
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Old Sep 21, 2004 | 10:59 AM
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Could be bad alignment, tires out of balance, driveshaft out of balance....to name a few. Normal minimum vibration??? I call
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Old Sep 21, 2004 | 06:58 PM
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Originally Posted by mitcher
Hello!

I intend to buy a 89 Vette here in Spain and want to thank you all the help that you have done. Now I know some important things to check it well before paying!

However, I still have a doubt about the vivration of the car. The last owner told me that, at high speed, the car vibrated a lot. Then replaced some parts and vibration was greatly decreased... but still existed. The guy visited the Vette factory again, but a mechanical told him that, for a car of this power, it is normal a minimum vibration.

Must I believe him?

Thank you all again! Naturally, I will be very grateful for any other advice to check well the car before buying it!
I responded to your other post as well!

What's the nature of the vibration? Is it constant throughout the speed range? What about the RPM range?

If it exists within a narrow or broader RPM range, say between 2000 and 3000 rpm for example, it may be driveline related. If it exists at all speeds or in a broad speed range, say from 60 mph up for example, it may be wheel and suspension related.

When I bought my 88 a few years ago, the vibration occurred between 50 and 65 mph, regardless of engine rpm. Turned out to be old tires and old shocks,

seeya
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