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motor/tranny mounts

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 79Cheyenne, Jul 9, 2000.

  1. 79Cheyenne

    79Cheyenne 1/2 ton status

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    I have a nasty vibration under acceleration, ujoints replaced didnt fixit. wheels balanced didnt fix it. A reliable source said to look into the motor mounts and transmission mounts for broken ones, well how do I do this, or could this be on the wrong track. when I coast no matter what the speed the vibration goes away, as soon as I add throttle it comes back???

    any suggestions would be appreciated, thanks


    <font color=orange>1979 BLAZER Cheyenne[​IMG]
     
  2. Balou

    Balou 1/2 ton status

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    hhhhmmmmm, I have the same prob., discovered a 3/4" crack in the crossmember under the engine mounts,
    that's probably the solution.
    Have a look for cracks!!!

    Balou
    "Size DOES matter!!!", said the girl last night.
    http://www.balou.coloradok5.com
     
  3. stephan van leir

    stephan van leir 1/2 ton status

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    Did you check the output bearing on your T-case? Do you run the NP 208 case, if so the slip yolk is probably worn. Just a thought. Good luck!
     
  4. 79Cheyenne

    79Cheyenne 1/2 ton status

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    I do have a small oil leak at the rear output of my NP203.
    How do I check if this is the source?

    <font color=orange>1979 BLAZER Cheyenne[​IMG]
     
  5. JimmyDie6.2

    JimmyDie6.2 1/2 ton status

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    also, make sure your flywheel and balancer are still intact (weights are still on, they are on tight etc.). check the weights on the drive shaft(s). hope this helps. JS
     
  6. Blazer79

    Blazer79 1/2 ton status

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    My NP203 was doing that too. Found out that the crossmember that holds it was loose to the frame. Make sure it's tight and put some washers or those nuts with plastic so they don't come off.

    <font color=blue>//////
    http://blazer79.coloradok5.com
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  7. nyyef

    nyyef 1/2 ton status

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    i have a crack in the exact same location. did you weld yours, or replace the crossmember?


    Knife.
     
  8. Balou

    Balou 1/2 ton status

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    At the moment I am just waiting if the crack becomes bigger.
    To me it seems much easier to replace the crossmember (bolt in), welding allways causes the metal to become weak around where u weld it.

    Balou
    "Size DOES matter!!!", said the girl last night.
    http://www.balou.coloradok5.com
     
  9. Blazer79

    Blazer79 1/2 ton status

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    I think you could drill one small hole on each end of the crack. That way the crack will not grow anymore.

    Hope this helps.

    <font color=blue>//////
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  10. Eric78K5

    Eric78K5 1/2 ton status

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    Check for cracks around the cross member. Also, I replaced my tranny mounts, cause mine were dry rotted. I only had slight vibration before, and new mounts seemed to make it go away. Hope this helps.
     

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