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vibration question

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Old Mar 19, 2005 | 10:20 PM
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I have a vibration in my car. My first thought was get the tires balanced. I haven't had the chance to get them done yet. Yesterday I noticed that the tires on the car are directional, and the rears are on backwards. Obviously the can both be corrected by flipping sides. Is it possible that this is the vibration?
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Old Mar 19, 2005 | 11:30 PM
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It should not be... but ... i would not rule out the possibility.
Older radials becasue of their belt construction were not designed to to be moved side to side. But you state these are uni- directional. I infer from that they they are of a newer construction, so it should not be can issue.
It would affect their ability to disperse water on a wet road. But it should not create a vibration
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Old Mar 20, 2005 | 12:37 PM
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i'd start by working around the tires... balance, alignment or even tire pressure.
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Old Mar 20, 2005 | 12:50 PM
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I hate when people install tires wrong, all the installer has to do is read the inside of the wheel, it tells you left or right and front or rear. The tires have the little arrow.
Having the wheels on backwards on an '87 will affect the cooling for the brakes. The fins are designed to draw air in for cooling. We tested this at the track and the result was cooler brakes with the wheels installed properly.

Maybe you have flat spots on the tires?
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Old Mar 20, 2005 | 03:29 PM
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Originally Posted by Mr Mojo
...Maybe you have flat spots on the tires?
Aside from tire pressure and alignment, that would be my guess.
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Old Mar 20, 2005 | 04:10 PM
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Wheel bearings? rotors out of round, tire psi, is the rood off (targa),driveshaft, miss in the engine (makes you think its tires) etc. you need to post a little more specific information, Does it go away at different speeds, does it get better/worse turning left or right (like long curves or changing lanes?)
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Old Mar 20, 2005 | 10:59 PM
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Half-shaft u-joints, high probability if it's not tires. Find a Hunter GSP9700 balancer it will eliminate the tires.

JS
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Old Mar 21, 2005 | 02:42 AM
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Originally Posted by jsinga
Half-shaft u-joints, high probability if it's not tires.
That is my experience. The old half shaft joints were frozen and did not make any typical clicking sounds. Driveline shook from 55 mph and up. After replacing all 6, life is once again smooth.
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