First Drive after building, Major shake

Transmission and Drivetrain Tech

  1. Calipag

    Calipag FABO Gold Member FABO Gold Member

    Messages:
    345
    Likes Received:
    129
    Joined:
    Apr 11, 2018
    Location:
    Corona California
    Local Time:
    3:31 AM
    WELL! I was on my way home with the Dart. This is the first long drive since we built her and had her aligned. The build consisted of, swapping the drive line and rear from a 74 Dart. Changing our 1970 from a /6 manual drum car, 7 1/4 rear SBP to a V8, power disc, 8 1/4 BBP car. I used all the factory items from the donor car engine, trans, driveshaft and rear.
    The engine is a fresh rebuild, I just serviced the trans (new filter and fluid) and rear prior to installation. It has all new tires, and a new factory rubber front end part with a fresh alignment. I replaced both front caliber and brakes and rear brakes and 1 wheel cylinder on the passenger side.

    The car drove great on the side streets, alignment was great and the car was running well.
    Then I jump on the freeway and get up to 50-55 and everything is good for a while then I get this terrible vibration through the whole car. It shook as if I had a flat, and I actually thought I may be losing the driveshaft. I pulled off the freeway to the nearest parking lot and checked over the car. Everything seemed the way it should be. I convinced myself that it was the road and started on my way again. The car ran fine, steering fine everything seemed good. After driving for awhile it did it again. I pulled to the shoulder and waited and then continued on. I got off the freeway and took side streets home the rest of the way. The car seemed fine on the side street even after getting up to 45-50.
     
  2. valiantwagonguy

    valiantwagonguy Well-Known Member

    Messages:
    923
    Likes Received:
    622
    Joined:
    Oct 20, 2005
    Location:
    Long Island
    Local Time:
    6:31 AM
    It could be a brake problem where a wheel is heating up or the universals
     
    • Thanks! Thanks! x 1
    • Mr. Sinister

      Mr. Sinister Devastation Manager FABO Gold Member

      Messages:
      1,197
      Likes Received:
      691
      Joined:
      Mar 3, 2017
      Location:
      Lenox, Mich.
      Local Time:
      5:31 AM
      New trans mount?
       
    • Calipag

      Calipag FABO Gold Member FABO Gold Member

      Messages:
      345
      Likes Received:
      129
      Joined:
      Apr 11, 2018
      Location:
      Corona California
      Local Time:
      3:31 AM
      Universals feel tight.
      I was thinking brakes, also but why only at speed- sometimes?
       
    • Calipag

      Calipag FABO Gold Member FABO Gold Member

      Messages:
      345
      Likes Received:
      129
      Joined:
      Apr 11, 2018
      Location:
      Corona California
      Local Time:
      3:31 AM
      I did not replace the trans mount but there is no thump on the floor when I go from D to R. I was taught that was a tell of a bad trans mount.
       
    • Mr. Sinister

      Mr. Sinister Devastation Manager FABO Gold Member

      Messages:
      1,197
      Likes Received:
      691
      Joined:
      Mar 3, 2017
      Location:
      Lenox, Mich.
      Local Time:
      5:31 AM
      Bolts tight? Trying to help not hinder.
       
      • Thanks! Thanks! x 1
      • Agree Agree x 1
      • 67Dart273

        67Dart273 FABO Gold Member FABO Gold Member

        Messages:
        45,658
        Likes Received:
        13395
        Joined:
        Oct 14, 2010
        Location:
        Idaho
        Local Time:
        3:31 AM
        This is VERY disturbing. Vibrations usually are not intermittent. That is usually they come on at certain speeds, certain gears, certain engine RPM. This might be something, loose wheel, improper wheel fit to hub (such as wheel with too small center bore not centering properly on hub) I don't know. Something loose, allowing a "shimmy" situation

        I WOULD NOT DRIVE this until you can do an in -depth look at things. Try different wheels/ tires a pair at a time.
         
        • Agree Agree x 2
        • Tooljunkie

          Tooljunkie King of cobble/master of the broken bolt FABO Gold Member

          Messages:
          16,253
          Likes Received:
          16022
          Joined:
          Jul 22, 2017
          Location:
          Manitoba
          Local Time:
          5:31 AM
          Brakes. Had a ranger do it last fall. Owner used the parking brake and it hung up. Causing a drum to go out of round when it got hot. It did get very hot.
           
        • MoparMike1974

          MoparMike1974 FABO Gold Member FABO Gold Member

          Messages:
          2,745
          Likes Received:
          1980
          Joined:
          Jun 16, 2017
          Location:
          Maryland
          Local Time:
          6:31 AM
          My vote is brakes also.
           
          • Thanks! Thanks! x 1
          • Blind Squirrel

            Blind Squirrel Well-Known Member

            Messages:
            846
            Likes Received:
            670
            Joined:
            Oct 1, 2015
            Location:
            Pacific NW
            Local Time:
            5:31 AM
            Did you redo the front wheel bearing sets? It could be wheel bearings. If you set them to tight. Once everything heats up and starts expanding they start grabbing at the races.

            And check your lug nut torque.
             
            Last edited: Apr 11, 2019
            • Thanks! Thanks! x 1
            • Dana67Dart

              Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

              Messages:
              5,298
              Likes Received:
              3313
              Joined:
              Jul 16, 2017
              Location:
              Northern Colorado
              Local Time:
              4:31 AM
              My vote is out of balance tire and /or bad shock .

              1. Out of balance tire, slow enough the out of balance is not sufficient to produce vibration. Fast enough and things get to bouncing.

              2. Bad shock, at speed everything is fine til the tire hits a large enough bump to get it to bouncing and hits its harmonic frequency and amplifies.

              3. Alignment off, yes it was just done but it might not be right. My 67 dart has a shimmy at 40 to 45 everything is in acceptable shape but I'm sure the alignment is off. Above or below the speed and it drives great, no pull good road feel.
               
              • Thanks! Thanks! x 1
              • Dana67Dart

                Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

                Messages:
                5,298
                Likes Received:
                3313
                Joined:
                Jul 16, 2017
                Location:
                Northern Colorado
                Local Time:
                4:31 AM
                Another thought.. do you know the other car drive train didn't do this too?
                 
              • RustyRatRod

                RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

                Messages:
                65,845
                Likes Received:
                39169
                Joined:
                Jun 7, 2010
                Location:
                Georgia
                Local Time:
                6:31 AM
                Bad tires sometimes do this when they begin to separate.
                 
                • Agree Agree x 2
                • Like Like x 1
                • MrJLR

                  MrJLR Built, not bought FABO Gold Member

                  Messages:
                  5,080
                  Likes Received:
                  5238
                  Joined:
                  May 14, 2015
                  Location:
                  Chino, California
                  Local Time:
                  3:31 AM
                  Wheel ballance?

                  Jeff
                   
                  • Thanks! Thanks! x 1
                  • CCHHAARRGGER!

                    CCHHAARRGGER! Well-Known Member

                    Messages:
                    129
                    Likes Received:
                    70
                    Joined:
                    Dec 5, 2017
                    Location:
                    california
                    Local Time:
                    5:31 AM
                    If its not the tires , the only other thing it could be is a bent drive shaft. I had a similar vibration only at highway speeds . The rear view mirror was useless because it was vibrating so much. It took a wile to figure it out. My Driveshaft came from a 70 duster in a junkyard . I took it and installed on my barracuda without getting it re balanced or checked out. I finally had enough took it out to bring to the drive line shop so they can measure the correct length for a new shaft. The tech takes my old driveshaft , rolled it on the ground . Then we saw the beg bend in the tube. Problem solved
                     
                    • Thanks! Thanks! x 1
                    • jboyd2

                      jboyd2 68 cuda

                      Messages:
                      240
                      Likes Received:
                      18
                      Joined:
                      Apr 21, 2015
                      Location:
                      Arkansas
                      Local Time:
                      5:31 AM
                      Checked the u joints and transmission mount?
                       
                      • Agree Agree x 1
                      • inertia

                        inertia Well-Known Member

                        Messages:
                        3,351
                        Likes Received:
                        610
                        Joined:
                        Feb 4, 2011
                        Location:
                        Victoria B.C. Canada
                        Local Time:
                        3:31 AM
                        Not enuff + Caster, causing "shopping cart" wheel shimmy.
                        Prob set to factory specs. for bias tires.
                        Check the alignment setting from the alignment shop, if the caster is near "0", or negative -
                        Try having the alignment set to attached chart for radial tires.

                        alignment-specifications.gif

                        Bad tire/balance, with bad shock is viable, - brakes - not so much.
                         
                        Last edited: Apr 11, 2019
                        • Thanks! Thanks! x 1
                        • Agree Agree x 1
                        • Calipag

                          Calipag FABO Gold Member FABO Gold Member

                          Messages:
                          345
                          Likes Received:
                          129
                          Joined:
                          Apr 11, 2018
                          Location:
                          Corona California
                          Local Time:
                          3:31 AM
                          Yes, tires are new and have been balanced.
                           
                          • Like Like x 1
                          • Calipag

                            Calipag FABO Gold Member FABO Gold Member

                            Messages:
                            345
                            Likes Received:
                            129
                            Joined:
                            Apr 11, 2018
                            Location:
                            Corona California
                            Local Time:
                            3:31 AM
                            New Tires and balanced
                             
                          • Calipag

                            Calipag FABO Gold Member FABO Gold Member

                            Messages:
                            345
                            Likes Received:
                            129
                            Joined:
                            Apr 11, 2018
                            Location:
                            Corona California
                            Local Time:
                            3:31 AM
                            I do not.
                             
                          • Calipag

                            Calipag FABO Gold Member FABO Gold Member

                            Messages:
                            345
                            Likes Received:
                            129
                            Joined:
                            Apr 11, 2018
                            Location:
                            Corona California
                            Local Time:
                            3:31 AM
                            Brand new tires with balance and new shocks all the way around. The rear springs are the only items not replaced. I did use the original factory torsion bars.
                            The alignment guy that I took it to is a area expert for classic and custom cars.
                             
                          • Calipag

                            Calipag FABO Gold Member FABO Gold Member

                            Messages:
                            345
                            Likes Received:
                            129
                            Joined:
                            Apr 11, 2018
                            Location:
                            Corona California
                            Local Time:
                            3:31 AM
                            This is something I'm going to check. I did have all of that apart and didn't thing of the front bearings.
                             
                          • MrJLR

                            MrJLR Built, not bought FABO Gold Member

                            Messages:
                            5,080
                            Likes Received:
                            5238
                            Joined:
                            May 14, 2015
                            Location:
                            Chino, California
                            Local Time:
                            3:31 AM
                            Sometimes a weight can come off....costs nothing to take a peek....

                            Jeff
                             
                            • Agree Agree x 2
                            • plumkrazee70

                              plumkrazee70 Well-Known Member

                              Messages:
                              2,657
                              Likes Received:
                              746
                              Joined:
                              May 5, 2013
                              Location:
                              Medford, Oregon
                              Local Time:
                              5:31 AM
                              He may be an expert, but what are the alignment specs? Did he give you a print out?
                               
                              • Thanks! Thanks! x 1
                              • Cuda Al

                                Cuda Al Well-Known Member

                                Messages:
                                1,116
                                Likes Received:
                                1226
                                Joined:
                                Oct 21, 2007
                                Location:
                                Lompoc, CA
                                Local Time:
                                3:31 AM
                                Driveshaft out of balance?


                                Alan
                                 
                                • Thanks! Thanks! x 1
                                1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                                  By continuing to use this site, you are consenting to our use of cookies.