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Still have vibration

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by wayne, Nov 6, 2001.

  1. wayne

    wayne 3/4 ton status

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    I just got the truck back on the road and still have the 55mph vibration. I fixed the t case and shimmed the axle 2 degrees more and no change. The trans mount looks worn and I will pick up a new one today and put it in and play with the t case drop some more. The driveshaft looks good all the joints are new so does anybody know what else I should check if the new mount does not work or playing with the t case drop? I do not know the angles but I have about 5" lift and the rear is shimmed about 5 to 6 degrees. I am running blocks that are a little over 3 inch and the ORD 1" zero rate and a 14ff.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  2. wayne

    wayne 3/4 ton status

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    BTW it is not the tires because it goes away as soon as I let off the gass and comes back when I get back on it. Also the 2 degrees seemed to help just a little.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  3. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Has the driveshaft been balanced? Did you seperate it and get it out of phase?

    See my rig at <a target="_blank" href=http://coloradok5.com/gallery/Leadfoot> click here </a>
     
  4. Emmettology 101

    Emmettology 101 3/4 ton status

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    What about the front d-shaft slip joint? Is it loose(ie exccessive play?) Even if it is in 2wd, it will vibe some!

    Mike

    <font color=green>"1024x768x256... Sounds like one mean woman."</font color=green>

    <a target="_blank" href=http://www.geocities.com/emmettology101>www.geocities.com/emmettology101</a>
     
  5. Boss

    Boss 1/2 ton status Author

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    Does the pinion angle match the Tcase yoke angle? You said you shimmed it 2 degrees, etc, but do the angles match? This can be easily checked with an angle finder.
    Boss

    Pic of my truck Before N' After
    <a target="_blank" href=http://coloradok5.com/gallery/BeforeNAfter>http://coloradok5.com/gallery/BeforeNAfter</a>
     
  6. Espen88k5

    Espen88k5 1/2 ton status

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    I would give that new tranny-mount a chance. Maybe even try it without the shims again after the new rubbermounts is in place.

    <font color=red><a target="_blank" href=http://www.espen88k5.alloffroad.com>www.espen88k5.alloffroad.com</a></font color=red>
     
  7. MudFrog

    MudFrog 1/2 ton status

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    What type of vibration is it? I have a vibration around the same speed which I was thinking was the bearings spinning in my rear axle but I'm starting to think it's not. The vibration I'm getting is a really really fast shaking feeling coming from the rear end... kinda like a really fast shudder.

    89 K5 Silverado, 4", 33's, 3/4 ton axles
    <a target="_blank" href=http://mudfrog.rockcrawler.com>http://mudfrog.rockcrawler.com</a>
     
  8. MudFrog

    MudFrog 1/2 ton status

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    Oh yea... it only vibrates when my foot is off the gas, when I'm accelerating it does not.

    89 K5 Silverado, 4", 33's, 3/4 ton axles
    <a target="_blank" href=http://mudfrog.rockcrawler.com>http://mudfrog.rockcrawler.com</a>
     
  9. Derf00

    Derf00 1/2 ton status

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    Wayne,

    That is exactly what my Jimmy did after the 4" lift. I had the drive shaft balanced and lengthended and it did not help. Lowering the t'case solved the problem for me. I agree with Boss, it is probably caused by different angles.

    Derf00
     
  10. Espen88k5

    Espen88k5 1/2 ton status

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    Also if you have the original slip-yoke out to far from the transfercase the u-joint could start spinning ex-centeric when they get upp to speeds above 55. A solution here would be a fixed yoke conversion, or larger u-joints and driveshaft from a 3/4 ton.

    <font color=red><a target="_blank" href=http://www.espen88k5.alloffroad.com>www.espen88k5.alloffroad.com</a></font color=red>
     
  11. wayne

    wayne 3/4 ton status

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    Thanks guys. Well after driving it some more tonight it actually feels worse with the extra 2 degrees in it. I will put the new mount in and drop the case a little more to help match the angles. It does look like the angle at the case is more then at the axle. I have no plan to do a fixed yoke on it since a 400/205 will be in it soon.

    See <a target="_blank" href=http://coloradok5.com/gallery/Waynes-Toy>Project Mighty Mouse</a> here.
    <font color=blue>Wayne<font color=blue>
    <font color=blue>Happy Trails<font color=blue>
     
  12. ftn96

    ftn96 1/2 ton status

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    Well, you answered you own ?. The angle at the T-case is greater thatn the one at the yoke. YOu need to get an angle finder to rid yourself of this problem. You can order one from Snap-on for 25 bones or you can get one from Harbor Freight for a little less.
    Every liftkit installer should have one. The Snap-on one I got kicks ass.!!!!!!

    Surgeon General's Warning:
    Viagra and steroids may be harmful to your spouse![​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  13. yunit

    yunit 1/2 ton status

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    I did what Pete Corsmitt said and my angle look almost perfect. I actually had to angle down my 14bolt for the angles to match on a 4" lift. Remember that dropping the tcase will change the angle of the output on the case but also the rear axle as well. I am going to drop my case only by an inch and no more. Later.

    1987 Jimmy Sierra Classic, Palisades Park, NJ 07650
     

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