89 GMC Suburban shaking at 45 mph and 65 mph

Discussion in 'GMC Truck Forum' started by ponie1992, Jun 12, 2008.

  1. ponie1992

    ponie1992 Full Member

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    Hey guys, new here. Just picked up an 89 Suburban and noticed a significant shake at 45 mph that goes away at around 50 mph and comes back at 65 mph and goes away again at 70 mph. Haven't had it any faster than that. Any ideas? It seems the whole truck shakes when it does it.
     
  2. DOUGLAS DARLING

    DOUGLAS DARLING New Member

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    could just be tires,or stableizer shock
     
  3. ponie1992

    ponie1992 Full Member

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    I'm leaning towards the shocks because I can see some cupping on the front tires, but I have never experienced that kind of shake because of shocks before. I have also never owned an SUV. I am also not sure how old the tires are, but may replace them when I'm able to. We'll see. In the meantime, keep the suggestions coming.
     
  4. leolkfrm

    leolkfrm Full Member

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    balance and rotate the tires, check air pressure to 75% of max. assuming its 4x4 the cupping shows up if the caster/camber is off
     
  5. ponie1992

    ponie1992 Full Member

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    Not 4x4. It is 2WD.
     
  6. ukrkoz

    ukrkoz Senior Member

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    recurrant shake at various speeds is the first sign of unbalanced tires. if balancing did not fix it, check hub bearings, most likely going bad. shocks won't do this.
     
  7. ponie1992

    ponie1992 Full Member

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    I'm thinking tires now. I noticed the driver rear has some movement to it. I followed behing the truck in my wifes car and it's hard to describe but the tire isn't true. Passenger rear seems to be ok, but I think I will replace both. Hopefully it will fix the problem.
     
  8. mantis

    mantis Full Member

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    look for a busted belt.Same thing was going on with my wifes Rodeo.It would shimmy at about 25 then at about 60.The rear driverside had a busted belt under the tread.Is there any pull to the right or left.Maybe alignment or ballance.I don't think its the shocks.You should hear it if its the wheel berrings.
     
  9. ponie1992

    ponie1992 Full Member

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    It doesn't seem to pull either way, so hopefully the tires will fix it.
     
  10. leolkfrm

    leolkfrm Full Member

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    if you over inflate the tires about 15lbs over max and it goes away its usually a belt shift. Do it to test only don't leave them over inflated
     

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