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Weird vibrations

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mrplow, Apr 10, 2001.

  1. mrplow

    mrplow Registered Member

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    Every time I get on the gas pedal, I get these werid vibrations up inside the truck up front. Everything like the blinker switch and the whole dash panel starts shaking.

    What the heak is wrong. It has new u joints and new steering. If I get of the gas and just let it cruise down the street, the vibrations go away. So it only occurs when I am on the gas pedal
     
  2. muddin4fun

    muddin4fun 3/4 ton status

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    What if it's parked and you rev the engine? Does it still vibrate?

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  3. DPI

    DPI 1/2 ton status

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    I had a similar vibration. Check your torque converter/flywheel bolts. Two of mine were slightly loose. I would also check for cracks in your flywheel while your there. Also check the rod that connects from the transfer case to the bellhousing. My 3/8" bellhousing bolt was also broke.
    I fixed both at the same time, so I am not sure what was causing the vibration. I would say it was the torque converter bolts and then the vibration caused excessive stress on the bellhousing/rod bolt.
    JM $.02

    [​IMG]
     
  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    Did this just start happening after the new u-jt's... sounds like driveshaft "BOOM"... happens around 35 and kinda fades and comes back... Did you mark the drive shaft before doing the jt's? Try pulling out the driveshaft and turning it 180 degrees (so part of shaft towards the bottom now, is facing the top). See if that helps any.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  5. mrplow

    mrplow Registered Member

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    It doesn't vibrate when I get on the gas when its in park
     
  6. muddin4fun

    muddin4fun 3/4 ton status

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    Then it's in your drive train somewhere. If it were the fly wheel, it would do it when it's in park also I would imagine. I would try rotating the drive shaft like was said, and if that's not it, take your drive shaft out and see if it's out of balance, then maybe the torque converter...i would think it's somewhere behind the tranny though.

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    How about tranny and engine mounts? Checked those? And the converter being loose/cracked flex plate, at least in my case, only rattles when under load, not revving in park...no vibration though.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  8. DPI

    DPI 1/2 ton status

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    Mine did not vibrate in park or nuetral, just under a load.

    [​IMG]
     
  9. zach78k5

    zach78k5 1/2 ton status

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    i agree with checking behind the tranny. the torque converter moves even when the truck is in park, i dont know for sure but i would think the flywheel might too and i know your harmonic balance does. that pretty much gets the expensive stuff i think. good luck
     

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