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Vibration... help..

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 85blaze, Oct 29, 2000.

  1. 85blaze

    85blaze 1/2 ton status

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    I just drove my blazer for the first time in a year and a 1/2 and it had this before i took it off the road, It vibrates at all speeds when it is under load. take your foot off the gas and it stops. So i've been thinking the driveshaft... out of balance or something... its got 10bolts,np208,700r4. Thanks!

    Project Silver Bullet
    http://coolwebworks.com/blazer/12jul991.htm
     
  2. MudFrog

    MudFrog 1/2 ton status

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    That would be my guess. Just crawl underneath of it and give the drive shaft a good shake and twist and if there is any play at the joints then your ujoints are bad. Right now I'm having a problem similar to this, but it feels like the transmission isn't down shifting properly.

    [​IMG]
    http://mudfrog.coloradok5.com
     
  3. backlash

    backlash 1/2 ton status

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    My guess is u-joints also. Some people recommend replacing them in pairs. May be something to that ... I keep replacing one at a time. Perhaps I wouldn't have so much trouble if I replaced both.
     
  4. sosamantx

    sosamantx 1/2 ton status

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    <font color=blue>That is always a hard one to figure out. I guess that if you think that it is the driveshaft, then the vibration seems to be coming from the center of the vehicle? I would also look for weights that may have fallen off of the driveshaft, u-bolts that may have come loose at the rear, torque convertor bolts, flexplate bolts, damaged trans. mount or loose bolts, crossmember bolts, etc., etc.. You just need to start checking everything, I am not ruling out u-joints either. It could also be an out of balance tire, or bad wheel bearings. I have seen cars on the highway and you just see 1 tire that is just bouncing like a basketball. You might want to have some else drive your truck, you follow and look for something like that. What about a broken/bad shock, or shock bolts?? Just my 2 cents worth. - Steve</font color=blue>

    <font color=blue>Steve Sosa a.k.a. "sosaman"</font color=blue>
    http://sosaman.home.texas.net/carpics.html
     
  5. 85blaze

    85blaze 1/2 ton status

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    Ok...

    The truck is about 1/2hour drive away so i will be going up tomarrow to play around with it. It would be nice if it were just a u joint because i just replaced the driveshaft...

    Project Silver Bullet
    http://coolwebworks.com/blazer/12jul991.htm
     

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