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1978 With a Vibration.

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Old Oct 16, 2012 | 03:14 PM
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Default 1978 With a Vibration.

Hi i have a 78 with a vibration at around 70mph rattles the dash. If i let up on the throttle just a little the vibration goes away. im going to have the tires checked for balance then re balance. if it is a drive line issue is there any way to tell if its the drivshaft or half shaft ?? Any help would be excellant thanks.
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Old Oct 16, 2012 | 03:23 PM
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Can happen if rear wheel camber is off. Park in a level spot and see if your back tires are pretty much straight up and down.
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Old Oct 16, 2012 | 03:26 PM
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Try placing the shifter in neutral at 70mph and let the RPM drop. If the vibration goes away the source is engine related.
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Old Oct 16, 2012 | 06:21 PM
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I had this same issue on my car. I needed new tires anyhow due to wear. So I ruled them out. In short, I didnt find the issue till swapped the torque converter. I noticed that one of the Ujoint straps on the drive shaft had come off. I went ahead and took that opportunity to replace all the ujoints.

All I am sayin is a visual check under there would have helped my issue with the missing strap. I never would have guessed that to be a possibility.
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Old Oct 16, 2012 | 09:23 PM
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I had the same problem at about 60 and it was my harmonic balancer. Do what melwff said and see if the problem goes away in neutral.
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Old Oct 16, 2012 | 10:55 PM
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i have the same problem on my 76, i havent had the tires balanced yet but i did notice that mt drivers side rear wheel is leaning in on the top and the passenger side is straight which is right and will this cause a vibration?
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Old Oct 16, 2012 | 11:43 PM
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Originally Posted by flameorange76l48
i have the same problem on my 76, i havent had the tires balanced yet but i did notice that mt drivers side rear wheel is leaning in on the top and the passenger side is straight which is right and will this cause a vibration?
It sure did on my '77.
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Old Oct 17, 2012 | 11:04 AM
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I know this is "off the wall",check to see if your exhaust is touching anywhere.

You could have vibration from the exhaust.

Good luck
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Old Oct 17, 2012 | 12:18 PM
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Originally Posted by 25anniv
Hi i have a 78 with a vibration at around 70mph rattles the dash. If i let up on the throttle just a little the vibration goes away. im going to have the tires checked for balance then re balance. if it is a drive line issue is there any way to tell if its the drivshaft or half shaft ?? Any help would be excellant thanks.
ether the rear end bushing is bad gone or loose, or you need a drive train alignment.

http://forums.corvetteforum.com/c3-t...lso-still.html

Last edited by pauldana; Oct 17, 2012 at 12:20 PM.
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Old Oct 22, 2012 | 07:47 PM
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Have not been under car for awhile trailing arms have been serviced tie rod arms have been replaced. last year replaced front end ball joints, control arm bushing, frt rotors and any other rubber parts. if it is this rear end bushing where about is it ? how do i know its bad ? can i do the job myself ? thanks for your help
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Old Oct 23, 2012 | 10:47 AM
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Originally Posted by flameorange76l48
i have the same problem on my 76, i havent had the tires balanced yet but i did notice that mt drivers side rear wheel is leaning in on the top and the passenger side is straight which is right and will this cause a vibration?
Camber on the rear wheels should be slightly negative; they should lean in at the top. On a level piece of pavement, about 1/8" to 3/16" in from plumb vertical is about right, when measured at the wheel rims.
If you take your measurements exactly 14 5/16" apart, 1/4 inch equals one degree.
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