1973 RS LT Z28- chasing a vibration above 40 MPH

Discussion in 'Troubleshooting & Diagnosis' started by Lou6t4gto, Dec 2, 2017.

  1. BigBlock73

    BigBlock73 Veteran Member Lifetime Gold Member

    1,922
    25
    Jul 10, 2002
    Accord,New York
    Flajunkie
    Have you reached out to big gear head.
    He is wealth of knowledge
    He helped me out when I was having issues with my axle
     
  2. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

    5,978
    93
    Mar 24, 2001
    Rockledge, Florida
    No, I haven't. But I did find a local performance restorer that is less than 2 miles away. I will stop by there later and see if i can trust them. They charge $77 and hour for their work. Ouch.
     
  3. COPO

    COPO Veteran Member Lifetime Gold Member

    16,396
    283
    Sep 15, 1999
    Ontario, Canada
    I would swap the 4 tires/rims with a friend and see if the
    noise goes away.
     
  4. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

    5,978
    93
    Mar 24, 2001
    Rockledge, Florida
    Did that a long time ago...made slight difference. Putting the radials made a difference as well. Still vibrates at high speeds. Thanks.
     
  5. Pro71bird

    Pro71bird New Member

    8
    5
    Dec 17, 2017
    I have a vibration above 65 MPH and need to try a new set of wheels. Everything else hasn't helped.
     
  6. jbloake

    jbloake Veteran Member

    261
    32
    May 1, 2002
    NS Canada
    Had a vibration you could feel in the seat of my 4x4 with 4 wheel disc brakes . I was blaming the tires because of age. Installed different wheels and new tires for winter . Same Vibration , no change . Replaced rear rotors ,Problem solved ! Drums may act the same .
     
  7. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

    5,978
    93
    Mar 24, 2001
    Rockledge, Florida
    I keep looking at the added rear rotors as a possibility...
     
  8. Twisted_Metal

    Twisted_Metal Moderator Staff Member Lifetime Gold Member

    25,833
    471
    Feb 26, 2004
    Bloomington, MN
    I have a vibration in mine... Very specific speed, 62-67 mph. (3rd or OD)
    I know it's a pinion yoke issue as I "temporarily" shimmed the u-joint to almost eliminate it. (Long story)

    To do it right... I need a new yoke and a set of gears as the current ones were never set up properly and have had a whine to them for the past 50K miles.

    Anyway... Check for side to side play in the u-joint at the pinion yoke.
    The u-joint can be tight when checking its rotational movement but move along the axis of the u-joint within the yoke.

    Lots of ways to cause a vibration like you describe.
    I wish you luck!
     
  9. bcc7771

    bcc7771 Veteran Member Lifetime Gold Member

    115
    4
    Oct 10, 2013
    houma,la
    had the vibration issue to. all new front and rear suspension. brought to shop tires and all re-balanced. Were new by the way....well long story short....broken transmission mount.
     
  10. Glenn LaBonte

    Glenn LaBonte New Member

    2
    0
    Mar 22, 2017
    Rochester Washington
    Check your pinion angle.
     

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