OUR VIDEOS GALLERY MEMBER SPONSORSHIP VENDOR SPONSORSHIP

User Tag List

Results 1 to 10 of 10

Thread: Vibration (not shimmy) source?

  1. #1
    Beginner
    Join Date
    Apr 2012
    Location
    Brisbane, Qld
    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Vibration (not shimmy) source?

    Hi, I have a '93 Maverick/GQ patrol - (the best 4WD that Ford never made)




    The Basics
    • 4.2D naturally aspirated
    • Manual box
    • Wagon
    • Coil Springs
    • Disks all around
    • Approx 2" suspension lift
    • No body lift
    • 30" diam tyres on 16" Rims
    • No uneven tyre wear or scalloping etc.
    Symptoms
    • I have a high frequency vibration at approx 90 - 100 Kmh
    • Up to 85/90 Kmh - No vibration
    • Steering wheel doesn't shake.
    • Feels like the source of the vibration is not from the wheels, but middle to rear of vehicle.
    • Vibration frequency is too high to be tyre issues.
    • It feels much faster than the rotation speed of the wheels.
    • It almost feels "notchy" like gear teeth. But there is no unusual noise from diffs or gearbox.


    Attempts made to fix
    • Front wheel bearings replaced around a year ago, when I replace the front diff centre. There was a wheel stud that had somehow become lodged between the teeth of the crown wheel and pinion of the front diff prior to my purchase of the vehicle. I have pics.
    • All wheels balanced
    • Tailshaft removed, unis replaced, tailshaft balanced, tailshaft installed with slip-yoke to front as advised by Driveline due to rub marks from crossmember when it faced the standard way.
    • Transfer case replaced because of rear output shaft bearing showing a little play and weeping of oil.
      (Interestingly - the speedo is now very optimistic. GPS speed of 100 Kmh - Speedo shows 115 Kmh.)


    Questions
    • Is it possible the transfer case has reduction gears or something in High range? - or is it just a different speed sensor in the xfer case. She does seem to be accelerating a little quicker.
    • Can anyone venture a guess as to the likely source of the vibration?
    Cheers, Ross

    Gday Ross welcome aboard ive moved your thread to the intro section gotta friendly mob here fulla great info and advice
    Last edited by growler2058; 21st April 2012 at 02:05 PM.

  2. # ADS
    Circuit advertisement
    Join Date
    Always
    Location
    Advertising world
    Posts
    Many

     

  3. #2
    Expert johno90's Avatar
    Join Date
    Mar 2012
    Location
    Moranbah QLD
    Posts
    329
    Thanks
    2
    Thanked 107 Times in 72 Posts
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    First thing i would have looked at would have been your mounts. other then that handbrake drum, bushes!!!! everywhere, how certain are you that its from the middle? wheel alignment, King pins, ball joints. There were also 2 different types of transfer case for gq both look exactly the same so there could be you speed difference. Doesnt have to vibrate the steering to be a steering part either!

  4. #3
    Hardcore
    Join Date
    Dec 2011
    Location
    central coast nsw
    Posts
    2,011
    Thanks
    625
    Thanked 513 Times in 388 Posts
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Have you tried turning the tail shaft back around to compare.
    re-check unis feel smooth still, they can vib a bit.
    when you swapped tail shaft around they can be reassembled out of line and this also can cause a vibration.

    sometime the tail shaft angle can be to much for the unis to handle whilst turning and they vibrate as a result.
    usually over 2" lift for said angle, but ya never know.

    I some times get a vibration that sounds a bit like what you describe, but it is on a certain bit of RD only.
    small ripples in the asphalt I recon, never happens anywhere else though.

    speedo problem, transfer cases can have different drive gear tooth count, might be your problem.
    there's a thread on here about, talking on this subject, different drive gears incl part numbers.

  5. #4
    Patrol God Dhuck's Avatar
    Join Date
    Nov 2010
    Location
    Crap Weather State
    Posts
    10,142
    Thanks
    223
    Thanked 1,235 Times in 992 Posts
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    Welcome to the forum mate.
    In the words of a Dhuck "QUACK".

  6. #5
    SUCH IS LIFE Maxhead's Avatar
    Join Date
    Jun 2010
    Location
    ACT
    Posts
    11,839
    Thanks
    4,859
    Thanked 6,891 Times in 3,651 Posts
    Mentioned
    50 Post(s)
    Tagged
    1 Thread(s)
    G'Day and welcome to the forum mate
    ________________________
    ______ 2017 D-Max _______



    I don't have a short temper. I just have a quick reaction to bullshit


    WARNING: Towballs used for recoveries can, and do kill people and damage property.

  7. #6
    Beginner
    Join Date
    Apr 2012
    Location
    Brisbane, Qld
    Posts
    2
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by johno90 View Post
    First thing i would have looked at would have been your mounts. other then that handbrake drum, bushes!!!! everywhere, how certain are you that its from the middle? wheel alignment, King pins, ball joints. There were also 2 different types of transfer case for gq both look exactly the same so there could be you speed difference. Doesn't have to vibrate the steering to be a steering part either!
    Ok - thanks for the heads up. Next thing I will check is mounts everywhere for play/wear.

    Then I will take it for front end checkup.

    Not certain of where the vibration is coming from - just a hunch/hearing thing. Could easily be wrong.

    What are the differences between the two different transfer cases?

    Quote Originally Posted by Robo View Post
    Have you tried turning the tail shaft back around to compare.
    re-check unis feel smooth still, they can vib a bit.
    when you swapped tail shaft around they can be reassembled out of line and this also can cause a vibration.

    sometime the tail shaft angle can be to much for the unis to handle whilst turning and they vibrate as a result.
    usually over 2" lift for said angle, but ya never know.

    I some times get a vibration that sounds a bit like what you describe, but it is on a certain bit of RD only.
    small ripples in the asphalt I recon, never happens anywhere else though.

    speedo problem, transfer cases can have different drive gear tooth count, might be your problem.
    there's a thread on here about, talking on this subject, different drive gears incl part numbers.
    Tailshaft was only rebalanced and new unis fitted just before easter.

    With the tailshaft angle - is the solution to fit off-centre bushes (not sure what they're called) to adjust angle of rear diff, and to also slightly lower gearbox? (can the gearbox be lowered effectively by putting spacers between gearbox crossmember and chassis?)

    With fixing speedo problem - is the solution just a matter of swapping the drive gear from the old xfer case into the new one? - Can it be done whilst on the vehicle?

    Quote Originally Posted by Dhuck View Post
    Welcome to the forum mate.
    Thanks.

    Quote Originally Posted by NissPat View Post
    G'Day and welcome to the forum mate
    Cheers.


    Thanks for all the suggestions guys. I'm a newbie to forbies, but reasonably comfortable with a spanner. I don't mind having a go at the less complex stuff, but will chicken out if it looks beyond my limited capabilities. I'm also a bit of a tightwad and don't like to spend money if I can do the work myself. I would have replaced the rear unis myself, but since I couldn't balance the tailshaft - I let driveline do both jobs.

    One other thing I have noticed - I don't know if it could be related is a little clutch shudder on take-off. There is no slipping of the clutch that I can detect at any speeds.

    My wallet hopes the answer isn't something expensive.

    Thanks again for the help, Ross.

  8. #7
    RIP - valued member and true gentleman of this forum that will be missed by many! Silver's Avatar
    Join Date
    Feb 2011
    Location
    Brisvegas
    Posts
    2,712
    Thanks
    828
    Thanked 502 Times in 397 Posts
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    G'day Ross, might be worth copying your question to General Mechanical as not everyone looks at the intros
    RIP - valued member and true gentleman of this forum that will be missed by many!

    "As a boat owner and a four wheel drive owner I feel like a pelican: every where I look I see a big bill in front of me”

  9. #8
    Hardcore
    Join Date
    Dec 2011
    Location
    central coast nsw
    Posts
    2,011
    Thanks
    625
    Thanked 513 Times in 388 Posts
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Sometimes new parts can be no good straight out of the box.
    not having a go at anybody, these things happen.
    just an idea for ya to check up

  10. #9
    Advanced powkers's Avatar
    Join Date
    May 2012
    Location
    Bydgoszcz, Poland
    Posts
    32
    Thanks
    22
    Thanked 58 Times in 11 Posts
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I think the reason is crosspiece of the propelling shaft.

  11. #10
    Expert Lieney's Avatar
    Join Date
    May 2012
    Location
    Adelaide,SA
    Posts
    284
    Thanks
    13
    Thanked 74 Times in 39 Posts
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    See if you can isloate the vibration.
    Does vibration change with RPM?
    Does it change depending on the gear you are in?
    Is it different with clutch in or out?
    Check your wheel nuts and balance.
    06 GU IV Nissan Patrol wagon 3.0L, Tough Dog 2" lift, Xrox bar, 12k Mako winch, 33" muddies, 3" exhaust, Awning, UHF, drawers & fridge, custom sliders, DVDs, custom water tank and pump, rack etc etc.
    Now just in - GQ Shorty 4.2 petrol, UHF - but looking at turbo or V8 conversion

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •