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Vibrations

Discussion in 'Intermediate CJ-5/6/7/8' started by Tree cutter 08, May 8, 2019.

  1. May 8, 2019
    Tree cutter 08

    Tree cutter 08 Member

    Cleveland ga
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    Back to the experts! Finally got to take a few longer drives yesterday. Got side pipes put on and can hear more now that it's not straight headers! I noticed while driving I have a vibration on accerleration and deceleration. Ones as bad as the other. There's a sweet spot if you just when you go from throttle to coast that's smooth as silk. I didn't get a chance to throw it in netural to see if that made a difference. 2.5 inch lift with shims installed that came with the kit. Rear end feels tight, ujoints are newish and greased and tight. Just a tad of play at the yoke on back of the transfercase. Just enough to know it's there. Reckon that's where it's at? Angle at pinion isn't sever at all and almost pointing at transmission but just a slight angle still .
     
  2. May 8, 2019
    Lockman

    Lockman OK.....Now I Get It . 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Silver Hill,...
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    How's it Running ? ( Could be engine vibration). Also I've left my front hubs locked in while running in 2 Wheel Hi . That could do it too, but I'm thinking timing or Points or carburetor? You said that if you catch the ' Sweet Spot ' from load to no load, could very well be the timing or dwell is off ?
    Then again, could be something like a Throw out bearing , if you dump in the clutch to coast ?:shrug:
     
  3. May 8, 2019
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Driveshaft u-joint?
     
    47v6 likes this.
  4. May 8, 2019
    ITLKSEZ

    ITLKSEZ Hope for the best, prepare for the worst

    Liberty Lake, WA
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    Both u-joints in the driveshaft have to be in phase and at equal, or near-equal angles. Watch this video and compare to what you have.

     
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  5. May 8, 2019
    zila

    zila I throw poop

    Rock Springs,...
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    Oct 6, 2003
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    Could be U-joints or alignment or tire balance. Tire balance and alignment cause resonance and can be driven through. U-joints just vibrate more with speed.
     
  6. May 8, 2019
    Tree cutter 08

    Tree cutter 08 Member

    Cleveland ga
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    Feb 14, 2019
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    Engine runs smooth as silk. I'm leaning towards driveline vibration. I had a wrangler years ago and got into vibrations when I lifted it 8 inches. seems like I cut perches and re angled the rear end but that's been a long time ago. First though u joints but it's pretty consistent at all speeds. I would have like to have known how it drove before the lift. I bought it not running before I rebuilt it. Just trying to start with the easiest solutions and go from there.
     
  7. May 9, 2019
    Tree cutter 08

    Tree cutter 08 Member

    Cleveland ga
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    Feb 14, 2019
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    That video explained alot. Maybe I should remove the shims and try it.
     
  8. May 9, 2019
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Usually when the vibration occurs when power is applied, and conversly under decelleration load, its a driveshaft angle or bad u-joint. This is assuming the driveshaft splines are lined up so the u-joints are in the same plane with each other.
    Unless you have a double cardin joint, you don't want the pinion to point to the transmission.
    -Donny
     
    Tree cutter 08 likes this.
  9. May 9, 2019
    Brian Beck

    Brian Beck New Member

    Colorado Springs
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    Apr 23, 2019
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    I would think driveline. Could be a slight bend in the drive shaft too. Is there a place near you that can check the drive shafts out for balance and being straight?
     
  10. May 9, 2019
    Tree cutter 08

    Tree cutter 08 Member

    Cleveland ga
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    I'm going to try to remove the shims tommrow and see if it improves. That should put the angle similar to the angle at the tranny.
     
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  11. May 10, 2019
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
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    Remove the rear shaft and drive it on the front.
    See if anything changes.
     
  12. May 10, 2019
    Chilly

    Chilly Active Member

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    Or lower tranny cross member. But you are on the right track to keep angles close to the same.
     
  13. May 10, 2019
    mrtii

    mrtii 1972 cj51986 cj7 2022 Sponsor

    gilroy, California
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    My first place to look is drive lines bale and health of u joints
     
  14. May 10, 2019
    mrtii

    mrtii 1972 cj51986 cj7 2022 Sponsor

    gilroy, California
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    Sorry balance
     
  15. May 12, 2019
    Tree cutter 08

    Tree cutter 08 Member

    Cleveland ga
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    Feb 14, 2019
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    I took the shims out that came with the lift springs. Pinion angle is close to angle at tranny now. Took it for a spin and vibrations are gone! Thanks for the help guys! Funny thing is it drives amazingly better now. Drives how a jeep should drive. The dart that The steering had is gone. Can anyone explain this?
     
    ITLKSEZ likes this.
  16. May 12, 2019
    Chilly

    Chilly Active Member

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    Driveline misalignment can impart heavy burtations into other parts of the vehicle. It's science.

    That's pretty cool to have fixed both issues. Was anything loose? Maybe the shackle bushings had been tightened with one wheel in the air, causing the system to be sort of wound up on one side? The work you did fixed SOMETHING else. Cant see how the vibes would cause squirrelly steering, other than burtations of course.
     
  17. May 12, 2019
    Tree cutter 08

    Tree cutter 08 Member

    Cleveland ga
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    Nothing was loose. Very strange that it fixed the handling issue. Hit 50 mph on my curvy road that 30 was sketchy last trip out.
     
  18. May 13, 2019
    sterlclan

    sterlclan Member 2022 Sponsor

    exploring the...
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    We’re the center bolts in the holes on the perch? When my perches collapsed it got all weird when on the throttle or when letting off It would pull left under acceleration and right on deceleration Loose bolts will make it all stupid too.
     
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  19. May 13, 2019
    Tree cutter 08

    Tree cutter 08 Member

    Cleveland ga
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    Feb 14, 2019
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    No they were lined up and ubolts we're tight. Strange but a good thing.
     
  20. May 14, 2019
    Focker

    Focker That's a terrible idea...What time? Staff Member

    WA
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    I'll look tomorrow.
     
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