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clunking noise

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MudRebel350, May 22, 2000.

  1. MudRebel350

    MudRebel350 1/2 ton status

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    When my truck downshifts into 1st gear i feel a clunk coming from the rear of the truck. I'm not sure if its the rear or the driveshaft or neither. When im slowing down and the speedometer hits 15 mph that is always when it happens, sometimes the clunk won't be as bad but I still wanna fix it.

    J.D.
    88 Gmc Jimmy
     
  2. MICHIGAN BLAZER

    MICHIGAN BLAZER 1/2 ton status

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    have you checked your u-joints lately....how about your rear pinion seal?

    <font color=red>MICHIGAN BLAZER
    <font color=green>89 Fullsize Blazer
    87 Cherokee
    65 IH Scout
     
  3. MudFrog

    MudFrog 1/2 ton status

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    Does the truck vibrate when your slowing down? If so that usually is a tip off that your U-Joints are worn down and about to break.
     
  4. Eagle86K5

    Eagle86K5 1/2 ton status

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    Also check your motor mounts and the tranny mount...

    <font color=green>[​IMG]Eagle86K5[​IMG]<font color=red>
    Masonry...It's a Good Thing
    2B1ASK1
     
  5. MudRebel350

    MudRebel350 1/2 ton status

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    the truck doesnt vibrate when i slow down. I can't get the plug out of the rear because the previous owner managed to round it out, so i don't want to take the cover off until i get the plug out.

    J.D.
    88 Gmc Jimmy
     
  6. DMK

    DMK 1/2 ton status

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    My plug was the same way, but there were a couple of threads sticking out. Used an 6" pipe wrench took some time but it worked.
     
  7. MudRebel350

    MudRebel350 1/2 ton status

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    I was thinking of using a pipe wrench, thats a good idea DMK. Great minds think alike

    JD
    88 Gmc Jimmy
     
  8. slodawg

    slodawg 1/2 ton status

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    My plug did the same thing. I took A nut the same diameter as the plug had a friend hold it up to the plug with pliers and tackwelded the inside of the nut to the plug. You dont want to get it to hot or weld it in the case, but if your carefull it will work. Then you can put a wrench on it and screw it out. I used mine like this for awhile. A new plug is fairly easy to get.
    Slodawg
     

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