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  vibration
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vegadan
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vibration
« on: March 17, 2018, 10:00:31 AM »
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I have a vibration issue with my 73 GA that has me stumped. Below about 60 everything is fine. But above that the car experiences a rythmic vibration. It occurs for about 3-4 seconds, subsides, then happens again. It's consistent and is not felt thru the steering wheel-it's more like the whole car shudders. It's not a significant shake but enough to be annoying and somewhat concerning. Since it doesn't happen continuously i don't think it's wheels, tires, brakes, front end components but then what do I know. Any thoughts, suggestions? Thanks, Dan.
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mlewisariz
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Re:vibration
« Reply #1 on: March 17, 2018, 07:44:53 PM »
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My first thought would be a front joint. Rear is usually more constant. Could also be in tandem w/soft trans mount.
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MDL
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Re:vibration
« Reply #2 on: March 19, 2018, 10:11:38 AM »
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since you are not feeling it in the steering wheel, I would concentrate more on the rear end and drive shaft (u-joints)  work you way up to making sure convertor bolts are tight.

If it was a front end issue, you would primarily feel it in the steering wheel
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Pontiac1976
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Re:vibration
« Reply #3 on: July 9, 2018, 09:12:44 AM »
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  I would say u-joins first but agree Quote: with Posted by: MDL
Posted on: March 19, 2018, 11:11:38 AM
since you are not feeling it in the steering wheel, I would concentrate more on the rear end and drive shaft (u-joints)  work you way up to making sure convertor bolts are tight.

If it was a front end issue, you would primarily feel it in the steering wheel 
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vegadan
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Re:vibration
« Reply #4 on: July 9, 2018, 10:51:44 AM »
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Thanks guys. I had new joints installed when I converted from auto to 4 speed (which I have since gone back to the automatic) about 4 years ago. I pulled the driveshaft and they look fine (as far as my novice eye can tell). Someone mentioned trying to rotate the shaft 180 degrees, which did nothing. I was thinking of bringing the shaft back in to have them check the balance and the joints.
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75 lemans
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Re:vibration
« Reply #5 on: July 10, 2018, 06:05:01 AM »
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Had a vibration problem on a Cadillac (Front wheel drive) with over 35,000 miles on Michelin tires.  Read or heard of problems with old tires causing vibrations.  Whether it was the tires or the wheel balancing when replacing those tires the vibration was gone.  Easy test you can reverse the front tires with the rear tires to see if you still have the vibration.
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SportCoupe
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Re:vibration
« Reply #6 on: July 10, 2018, 09:25:46 PM »
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It's most likely an unbalanced wheel or wheels.  Vibration with unbalanced wheels will generally only show up within a range of speeds.  60 mph is very common.  Try going 75+ and see if it clears up.  If so, when you go to get them rebalanced, ask them to use a high speed balancer and adhesive wheights that go on the inside of the wheel on the wall.  Don't use the typical hammer on wheights on the outside or inside wheel edge.

If you have high performance tires, I would suspect even more that this is your issue.
« Last Edit: July 10, 2018, 09:27:17 PM by SportCoupe » Report to moderator Logged
Pontiac1976
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Re:vibration
« Reply #7 on: July 14, 2018, 01:45:50 PM »
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You pulled the drive shaft. But do you have grease nipples
on the u-joints did you try to put grease in the to see if grease went in them. U-joints you moved them around & they felt smooth moved freely.

Now I would think the tires full air, rims not bent full of mud, lug nuts tight, rear axel bearing, diff gear fluid full mark, sway bar bars are tight  & bushing good.

Now the tire and the rims rear brakes & axel bearings would have been out of the list before the question.
but if not then that would be the first to check.
Then as MDL said and a I agree the next first thing as listed.
I do hope this helps hope you find the problem.
Please do tell every one the fix when you fid it. 
 
« Last Edit: July 14, 2018, 01:46:35 PM by Pontiac1976 » Report to moderator Logged

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SportCoupe
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Re:vibration
« Reply #8 on: July 21, 2018, 05:57:04 AM »
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Question.  Do you still have all of the hardware and linkage for the manual setup?
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vegadan
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Re:vibration
« Reply #9 on: July 25, 2018, 10:00:07 AM »
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Sorry guys. Haven't been on much due to "life gettin in the way". Haven't really done anything with the car lately-hopefully that will change soon. I do still have all the parts for the manual.
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SportCoupe
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Re:vibration
« Reply #10 on: July 25, 2018, 08:47:51 PM »
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If you're looking.to let them go, PM me and we can chat.
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vegadan
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Re:vibration
« Reply #11 on: July 27, 2018, 01:30:41 PM »
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PM sent
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