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Vibration found (?)...now how do I fix it?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Burbinator, Dec 17, 2001.

  1. Burbinator

    Burbinator 1/2 ton status

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    I think I finally found the source of my 65-75 mph vibration, after spending too much time on ruling out the tires and wheels and most everything else. Seems that my front driveshaft is spinning while in 2H. The tranny was rebuilt about 5 months ago and I'm thinking that the transfer case linkage wasn't properly adjusted when it was reinstalled. Is this just a simple adjustment done by jacking up the rear, putting it in Drive and adjusting till it stops spinning the front or am I looking at doing something more?

    TIA for any help!

    The learning curve is a toll road...ride with someone who has already paid!
    <a target="_blank" href=http://community.webshots.com/user/abshort>U.S.S. Nimitz II</a>
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Do you have auto hubs? It could be they aren't unlocking...

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
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  3. Burbinator

    Burbinator 1/2 ton status

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    That's the very first mod I did to the truck...ditched the autos for SuperWinch manuals. I verified all is well with the hubs prior to targeting further culprits.

    The learning curve is a toll road...ride with someone who has already paid!
    <a target="_blank" href=http://community.webshots.com/user/abshort>U.S.S. Nimitz II</a>
     
  4. RaisedK5

    RaisedK5 1/2 ton status

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    Basically, thats not an uncommon "Problem" i see it all the time on the freeway. You have a chain drive case right? Well the gear that drives the chain that drives the gear that turns the front, rides on the main shaft that goes to the back, as that shaft spins it just kinda pulls the gear along with it, so the front shaft ends up spinning, although quite a bit slower, theres really nothing wrong and no adjustment that i know of to be made.

    Leland aka RaisedK5

    "Of all the things I've lost, I think I miss my mind the most!"
    "Are the voices in my head bothering you?
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    The parasitic drag can be confirmed easily. In park, hubs unlocked,can you spin the front driveshaft by hand? If so then all is well, if not then it is somehow still engaged in 4HI...

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  6. RaisedK5

    RaisedK5 1/2 ton status

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    Ya parasitic drag!!! thats the word i was looking for. And ya what Rene said, spin the shaft by hand, it spins, all is right with the world, it doesn't, somethings wrong.

    Leland aka RaisedK5

    "Of all the things I've lost, I think I miss my mind the most!"
    "Are the voices in my head bothering you?
     
  7. riz

    riz 3/4 ton status

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    <font color=purple> The front driveshaft will spin even when 4 wheel drive is NOT engaged. .......... just not as fast ......... kinda slow like.

    L8r,
    . Riz . <a target="_blank" href=http://www.geocities.com/rizmonkey>www.geocities.com/rizmonkey</a>

    <font color=purple> BOW CHICKA BOW WOW !
     
  8. Burbinator

    Burbinator 1/2 ton status

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    I'll verify if it's free or not tonight and advise of the results.

    Thanks!

    The learning curve is a toll road...ride with someone who has already paid!
    <a target="_blank" href=http://community.webshots.com/user/abshort>U.S.S. Nimitz II</a>
     
  9. Burbinator

    Burbinator 1/2 ton status

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    OK...had an opportunity to delve further into this. The driveshaft initially wouldn't spin by hand, so I made sure the t-case shifter was pushed all the way into 2H. The shaft then free spun, but the shifter would work its way out of the "full forward" position and partially re-engage under normal driving conditions. A quick linkage adjust of about 1/8" and all is 4.0 again.
    However...the vibration remains!! I really need to slot a day for a microscopic inspection of everything. Perhaps this weekend...

    Thanks for the help!

    The learning curve is a toll road...ride with someone who has already paid!
    <a target="_blank" href=http://community.webshots.com/user/abshort>U.S.S. Nimitz II</a>
     
  10. Slayer

    Slayer 1/2 ton status

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    <font color=blue>Okay, this is certainly NOT the highest tech idea, but it works.
    </font color=blue><font color=green>
    I used a nylon tie down, 1 inch wide, with velcro ends. I wrapped it around the front drive shaft, and then the closest frame member.

    It stopped my front shaft from humming along, and if I ever need to use the 4-wheel drive, it will still work.
    </font color=green><font color=orange>
    If I don't take the tie down off, it will just wear out and fall off, but with the velcro it removes real easy.
    </font color=orange><font color=red>
    And if it snows or the roads ice up, or my favorite fishing hole has a tricky access road, I'm still ready. But best of all, I got rid of that damn vibration..................[​IMG][​IMG][​IMG]
    </font color=red>

    <font color=blue>I don't know everything, I just think that I do.............</font color=blue>[​IMG]
     
  11. Burbinator

    Burbinator 1/2 ton status

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    Good idea...thanks! I secured my driveshaft with a nylon zip tie; enough to hold it still, but breaks cleanly when the tcase is engaged.

    Update on the vibration...sometimes we overlook the simple things and go straight for the complicated fixes. Turns out the u-bolts that hold the cross of the rear joint onto the pinion yolk were just slightly loose with a little play. Replaced the cross and torqued the u-bolts...problem solved. Duh...should have checked that first!

    Thanks everyone for your input!

    The learning curve is a toll road...ride with someone who has already paid!
    <a target="_blank" href=http://community.webshots.com/user/abshort>U.S.S. Nimitz II</a>
     

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