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very bad vibrations
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mitymustang



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    Post: #1
    very bad vibrations

    here is the question i have been bugged about on one of my cars. i have a bad vibration in the drive train, i checked the rear end and all is well in that department, i put new tires and wheels on it still have the vibration, i replaced the drive shaft and still a vibrations, motor at idle does not have vibration but when going down the road at around 1800- 3500 rpm there is a very bad vibration, once i got the vibration to quit by getting in and out of the throttle. but eventually it started back. do anyone have any suggestions on what it might be?
    Offline 12-12-2010 08:02 PM
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    71fastback



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      Post: #2
      RE: very bad vibrations

      (12-12-2010 08:02 PM)mitymustang Wrote:  here is the question i have been bugged about on one of my cars. i have a bad vibration in the drive train, i checked the rear end and all is well in that department, i put new tires and wheels on it still have the vibration, i replaced the drive shaft and still a vibrations, motor at idle does not have vibration but when going down the road at around 1800- 3500 rpm there is a very bad vibration, once i got the vibration to quit by getting in and out of the throttle. but eventually it started back. do anyone have any suggestions on what it might be?

      I'm having the same problem with my 71. It happens when I'm slowing down. I have a c4 transmission. It's probably the tranny but I'm not really sure either. Anyone have any ideas?
      Offline 12-12-2010 08:07 PM
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      72HCODE


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        Post: #3
        RE: very bad vibrations

        Maybe harmonic balancer is slipping changing the balance on the crankshaft.
        Offline 12-12-2010 08:24 PM
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        mitymustang



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          Post: #4
          RE: very bad vibrations

          if this is so wouldnt the timing mark be out? because i thought i looked at that....and the timeing had not changed.
          Offline 12-12-2010 08:31 PM
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          72HCODE


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            Post: #5
            RE: very bad vibrations

            the only other things i could think of that would cause a vibration would be flywheel, or torque converter. unless your crank cracked. There was one guy that had a bad vibration and after looking high and low for it decided to drop the oil pan and look into the bottem end, and tried to move the crank around and noticed something didn't look right, so he pulled one of the bearing caps and the crank had snapped right behind the cap.
            Offline 12-13-2010 12:32 AM
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            akherber



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              Post: #6
              RE: very bad vibrations

              (12-13-2010 12:32 AM)72HCODE Wrote:  the only other things i could think of that would cause a vibration would be flywheel, or torque converter.

              +1 to these and the tranny. Are the vibrations bad when in gear or just at that rpm range?
              Offline 12-13-2010 12:36 AM
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              FastE



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                Post: #7
                RE: very bad vibrations

                (12-12-2010 08:02 PM)mitymustang Wrote:  here is the question i have been bugged about on one of my cars. i have a bad vibration in the drive train, i checked the rear end and all is well in that department, i put new tires and wheels on it still have the vibration, i replaced the drive shaft and still a vibrations, motor at idle does not have vibration but when going down the road at around 1800- 3500 rpm there is a very bad vibration, once i got the vibration to quit by getting in and out of the throttle. but eventually it started back. do anyone have any suggestions on what it might be?
                You may also want to check your trans mount.I chased a vibration many years ago on my Mach and did most of what you are talking about. Finally narrowed it down to the trans rubber mount.The mount looked good but the rubber had become soft.Just an idea.
                (This post was last modified: 12-13-2010 10:20 AM by FastE.)
                Offline 12-13-2010 10:19 AM
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                machman_73



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                  Post: #8
                  RE: very bad vibrations

                  My trans guy changed the trans mount and adjusted the pinion angle.
                  Got rid of 90 percent of my vibation. After changing the mount my fan rubbed the shroud on both of my cars. MB
                  (This post was last modified: 12-13-2010 03:53 PM by machman_73.)
                  Offline 12-13-2010 03:20 PM
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                  mitymustang



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                    Post: #9
                    RE: very bad vibrations

                    iv narrowed it down as far as i know and it has got to be the torque convertor or the the fly wheel.....iv checked all the above and all is good there.. maybe i can get some time soon and pull the tranny to check convertor and or the flywheel.. thanks for all the advise guys......oh by the way ill let everyone know what i find when i find it to close out the question for future users on here

                    akherber to answer your question it does the vibration in gear or out does not matter......but always at the same rpm range
                    (This post was last modified: 12-13-2010 09:10 PM by mitymustang.)
                    Offline 12-13-2010 09:02 PM
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                    FastE



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                      Post: #10
                      RE: very bad vibrations

                      (12-13-2010 03:20 PM)machman_73 Wrote:  My trans guy changed the trans mount and adjusted the pinion angle.
                      Got rid of 90 percent of my vibation. After changing the mount my fan rubbed the shroud on both of my cars. MB

                      Possibly wrong mounts? Never had any shroud issues.Why the pinion angle change? Were / are you using different housing / shock pads? Just curious.
                      Offline 12-13-2010 09:08 PM
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