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Vibration at 74mph?

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Old Oct 26, 2007 | 05:39 PM
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Default Vibration at 74mph?

It is not in the wheels or tires. I have had two sets of wheels and three sets of tires on it. Every time I am on the interstate and hit about 74 the car shakes really bad...

It has been wrecked before and the frame is a little bent(~1/4in). Could that cause it?

Also it has been aligned two times at different shops...
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Old Oct 26, 2007 | 06:16 PM
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Originally Posted by Banned for life
It is not in the wheels or tires. I have had two sets of wheels and three sets of tires on it. Every time I am on the interstate and hit about 74 the car shakes really bad...

It has been wrecked before and the frame is a little bent(~1/4in). Could that cause it?

Also it has been aligned two times at different shops...
Yes it could be especially if you have ruled out both the tires and the wheels. But I would also have a look at the Half shafts and the Drive Shaft.
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Old Oct 26, 2007 | 07:36 PM
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Originally Posted by Goldcylon
Yes it could be especially if you have ruled out both the tires and the wheels. But I would also have a look at the Half shafts and the Drive Shaft.
What am I looking for on them? Dents? Clumps of dirt?
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Old Oct 26, 2007 | 07:39 PM
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In the wheels did you mean rotors? I have an 84 and had to get my front rotors turned.

Hugh
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Old Oct 26, 2007 | 07:45 PM
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Originally Posted by hmcquade
In the wheels did you mean rotors? I have an 84 and had to get my front rotors turned.

Hugh
The rotors and pads are both somewhat new... I just can't rember if it was doing it before the new rotors. They were replaced while I was reparing it after the wreck. So I don't know if the wreck or rotors caused the vibration...

I will switch them around and see if that fixes it
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Old Oct 26, 2007 | 08:40 PM
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Ever consider having a friend follow you and watching closely when it starts shaking. Look for any 'wheel hop' at each wheel. Can't hurt to look.
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Old Oct 26, 2007 | 08:43 PM
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Originally Posted by Banned for life
It is not in the wheels or tires. I have had two sets of wheels and three sets of tires on it. Every time I am on the interstate and hit about 74 the car shakes really bad...

It has been wrecked before and the frame is a little bent(~1/4in). Could that cause it?

Also it has been aligned two times at different shops...
Check your shocks. Had a bad vibration at high speed, replaced two front shocks (they were broken) and vibration went away.
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Old Oct 26, 2007 | 09:26 PM
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Originally Posted by aminnich
Ever consider having a friend follow you and watching closely when it starts shaking. Look for any 'wheel hop' at each wheel. Can't hurt to look.
Good idea... will do
Originally Posted by MotorCity_87_C4
Check your shocks. Had a bad vibration at high speed, replaced two front shocks (they were broken) and vibration went away.
All four have less than 10k miles on them.
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Old Oct 26, 2007 | 10:45 PM
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Originally Posted by Banned for life
Good idea... will do

All four have less than 10k miles on them.
Mine had less then 10k on them but were cheep no name brand.
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Old Oct 26, 2007 | 11:48 PM
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Hey, isn't 74 mph over the speed limit?

Just giving you a hard time! I agree that the shocks could be causing some wheel hop that can cause some strange vibrations. Be sure and check tie rods as well.
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Old Oct 27, 2007 | 12:01 AM
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uhmmm,, drive at 73, ...or 75????

j/k

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Old Oct 27, 2007 | 12:07 AM
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If you take it up to say 80 does it get better or worse?

Also when you took it to the alignment shops, did they say that they were able to align it? I presume that you had a 4-wheel alignment done?
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Old Oct 27, 2007 | 07:06 AM
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A bad front wheel bearing caused vibration on my wifes '86.

Edit: after changing both front bearings.... I'm going to have to change the rears too.
During the test drive I still had just a bit of bounce on the left front... right rear is a bit loose after finally getting it up in the air and giving it a shake.

Last edited by mndwgz; Oct 27, 2007 at 02:28 PM. Reason: right rear
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Old Oct 27, 2007 | 07:38 AM
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Originally Posted by Banned for life
It is not in the wheels or tires. I have had two sets of wheels and three sets of tires on it. Every time I am on the interstate and hit about 74 the car shakes really bad...

It has been wrecked before and the frame is a little bent(~1/4in). Could that cause it?

Also it has been aligned two times at different shops...
Most likely you have a bad u-joint in the driveshaft and/or the axle shafts. There are six of them that can go bad. I doubt the accident has anything to do with it.
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Old Oct 27, 2007 | 07:39 AM
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Originally Posted by mndwgz
A bad front wheel bearing caused vibration on my wifes '86.
A bad rear wheel bearing did this to mine.
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Old Oct 27, 2007 | 09:54 AM
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Originally Posted by 89er
Most likely you have a bad u-joint in the driveshaft and/or the axle shafts. There are six of them that can go bad. I doubt the accident has anything to do with it.


Replacing the u-joints on my half shafts got rid of a minor vibration over 65 on my '88.
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Old Oct 27, 2007 | 11:11 AM
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Originally Posted by MyOtherCar
uhmmm,, drive at 73, ...or 75????

j/k


Originally Posted by MotorCity_87_C4
Mine had less then 10k on them but were cheep no name brand.
I got KYB's... I don't think it is the problem
Originally Posted by Andrew
Hey, isn't 74 mph over the speed limit?

Just giving you a hard time! I agree that the shocks could be causing some wheel hop that can cause some strange vibrations. Be sure and check tie rods as well.
Will do
Originally Posted by Mr. Peabody
If you take it up to say 80 does it get better or worse?

Also when you took it to the alignment shops, did they say that they were able to align it? I presume that you had a 4-wheel alignment done?
It gets worse, all the way up to top speed it never lets up. And yes, it was a 4 wheel.
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Old Oct 27, 2007 | 11:12 AM
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Originally Posted by xccter
Replacing the u-joints on my half shafts got rid of a minor vibration over 65 on my '88.
Anyway I can look at them and see a problem?
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Old Oct 27, 2007 | 02:30 PM
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Originally Posted by Banned for life
Anyway I can look at them and see a problem?
Get the tires off the ground and shake them.
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Old Oct 27, 2007 | 02:41 PM
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Originally Posted by Banned for life
What am I looking for on them? Dents? Clumps of dirt?
For excess vibration. its a crap shoot but if you get the car upinto the air safety and run it up you can see excess vibration in the driveline.
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