My 1968 Plymouth Sport fury

Early C Bodies - The Slab Side Years

  1. 1968 fury3 man:-)

    1968 fury3 man:-) New Member

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    Hi guys I have a few questions for guys that have a car like mine I have a weird shake / vibration that comes in at 70 mph is this normal I've replaced everything under the sun if you name it I've replaced it can't figure it out all the front suspension is brand new universal joints are all brand new I can't pin it down but also I'm looking for seats bucket seats and I'm looking for console and shifter linkage and rods if anybody can help me be gratefully appreciated IMG_20210413_125224509.jpg IMG_20210413_125224509.jpg
     
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  2. Boydsdodge

    Boydsdodge Member

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    Pinion angle comes to mind. How is your car lifted?
     
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  3. Pax2001

    Pax2001 New Member

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    agree with Boydsdodge, but have you altered or replaced the drive shaft? Is it balanced correctly?
    I'm going to skip the obvious wheel balance thing.
    Higher speeds affect different things than higher rpm's do.
     
  4. Boydsdodge

    Boydsdodge Member

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    What type of vibration are you feeling? Seat, steering wheel, throttle pedal, can't see out the rear view mirror?
     
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  5. mrfury68

    mrfury68 Senior Member

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    Transmission mount? BTW Love the color of your formal top. That was the same color as my dad's '68 Fury III sedan that I grew up in.
     
  6. HWYCRZR

    HWYCRZR Senior Member FCBO Gold Member

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    Likely driveshaft out of balance or one of your yokes bent from an aggressive hammer. My vibration was at 80 mph.
    I had a couple of dings in it. They straightened it and balanced plus straighten the yoke. No vibration up to 110.
    I get a little carried away with perfection sometimes but here is the thread.
    Drive Line Angle will drive you crazy
     
  7. CBODY67

    CBODY67 Old Man with a Hat

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    I'm suspecting the pinion angle for that elevated ride height. There are some shims in the aftermarket to reposition/tilt the rear axle on the leaf springs.
     
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  8. 69PHOENIX

    69PHOENIX Member

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    I think the term is Phasing.
    Look up the Term Tail Shaft Phasing, Might be Helpful.
    Also Interesting!
    Tony.M
     
  9. 57fury440

    57fury440 Member

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    Make sure the transmission bolts are all tight. Is the engine smooth when you rev it up?
     
  10. 1968 fury3 man:-)

    1968 fury3 man:-) New Member

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    Thanks guys I just seen every one's posts and I am thinking drive shaft pinion angle also I have air shocks with extensions
     
  11. 1968 fury3 man:-)

    1968 fury3 man:-) New Member

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    Yes engine is smooth
     
  12. 1968 fury3 man:-)

    1968 fury3 man:-) New Member

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    It feels like a vibration that I can fill in my seat and steering wheel
     
  13. 1968 fury3 man:-)

    1968 fury3 man:-) New Member

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    I replaced up and lower control arm bushings upper and lower ball joints front wheel bearings the drive shaft seems to be a two-piece before the rear universal joint looks to be like the drive shaft is pressed into itself with rubber Cushing dampener or something like that it couldn't be that right
     
  14. MarkLevi

    MarkLevi New Member

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    Another suggestion if you don't find it elsewhere: Check that your steering sector is "tight" to the frame - those mount bolts can loosen....

    Thanks
    Mark