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Unknown Vibration (another one)

Discussion in 'GM Powertrain' started by Pirate, Dec 21, 2009.

  1. Pirate

    Pirate New Member

    Hello all,

    I have a 99 Silverado that has started giving a weird vibration when I'm in OD when driving at a consistant speed between 30 and 55 mph. I let off the gas a bit or speed up it will go away until I stay at a consistant speed. Once I'm on the highway, I can set my cruise above these speeds and there is no vibration. I have noticed that if I put the truck in 3rd that there are no vibrations at all. I have had checked out but nothing been found. Drive shafts, U Joints, all fine there. I did have to replace a wheel barring even after that still there.

    Thanks for any info
  2. Project Reaper

    Project Reaper Rockstar 100 Posts

    is it a definite vibration from the wheels or could it be a misfire? take a look at your wheel barrings. everytime i have seen one go bad they usually shred and its very noticable that ones bad lol. look around at the whole suspension if you can and if you cant find anything at all i would get a inspeciton done. with a simple vibration its hard to diagnose anything really without any more description.
  3. Pirate

    Pirate New Member

    I 'm not sure right from the wheels. I'm sure it's not a misfire. The mechanic I took it too checked all that and thought maybe a transmission issue because of it only happening in OD. Thanks For the info and once I get a chance in the next couple days i'll give her a good look over and let you know. I appreciate the help.
  4. dustin_742

    dustin_742 New Member

    it could be your rear end going out.. the reason i say this is because when your giving it power the puts pressure from the pinion gear to the ring gear so there is no slop.. but when you let off that lets the the pinion gear slow down and not have pressure on the ring gear. if you take your differential cover off you would be able to see metal shavings or something could be broke.. also a quicker way is to take your driveline down and see if there is slop in the yoke.. or have someone watch under your truck to see if the yoke is sping when you put it in gear.. it should only move when the tires move.

    hope that helps you out a little bit. and good luck
  5. dustin_742

    dustin_742 New Member

    ps i say this cause i had the same problem.. good luck again
  6. vncj96

    vncj96 Epic Member 5+ Years 1000 Posts

    Easy check for wheel bearings. go for a good drive and stay dont use heavy breaking, when you come to a stop, get out and pur your hand on the center hub of each rim if they are hot then you have wheel bearing issues

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