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Fill plug replacement for 10 bolt

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by rampage, Jan 21, 2002.

  1. rampage

    rampage 1/2 ton status

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    I've had it with the fill plug for my rear 10 bolt.[​IMG] It's starting to round out on the inside and I'm afraid that one day I won't be able to remove it. Does anyone know what size and thread pitch it is (sort of looks like a metric size)? I would like to replace it with a hex bolt. TIA
     
  2. txbartman

    txbartman 1/2 ton status

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    I would pull the plug and go to Home Depot or a good hardware store. Thread it into some nuts until you get a match and you will know the size. Then, get you a good brass or socket head plug and all will be cool. I would be cautious about anything that would stick through the depth of the housing much like a bolt.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  3. rampage

    rampage 1/2 ton status

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    I'll be cutting the bolt so it won't protrud into the housing.
    I thought about matching plug, but since this is my only means of transportation, I was hoping someone knew off the top of their head. [​IMG]
     
  4. POFF

    POFF 1/2 ton status

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    Is it threaded in to the cast housing or the cover? If it's in the cast housing it should just be 1/2 NPT. I would get the plug from NAPA. They have higer quality pipe fittings than Home Depot. If it's in the cover try the dealer.

    '70 K-20 San Diego, CA
    I know, I can't spell!
     
  5. POFF

    POFF 1/2 ton status

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    Is it threaded in to the cast housing or the cover? If it's in the cast housing it should just be 1/2 NPT, if by chance 1/2" NPT is too big it wouldn't be smaller than 3/8" NPT. I would get the plug from NAPA. They have higer quality pipe fittings than Home Depot. If it's in the cover try the dealer.

    '70 K-20 San Diego, CA
    I know, I can't spell!
     
  6. rampage

    rampage 1/2 ton status

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    It's on the housing but larger than 1/2. It's more like 3/4 but the NC and NF nuts I tried wouldn't fit, that's why I'm thinking it's metric. I may just end up taking tx85gmcguy's advice and pulling the plug in the parking lot and be done with it ...
     
  7. 90K5

    90K5 1/2 ton status

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    Get a small bolt which has a threaded end that fits snugly into the square hole on the fill plug, and weld it on there, or have someone weld it there. a muffler shop will do it for like $3. Now you can use a normal socket to get it out, and its a lot easier. This is what I did, and it works great.

    90K5
     
  8. 84_Chevy_K10

    84_Chevy_K10 Banned

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    It's 1/2" NPT. Just get one at Autozone.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  9. rampage

    rampage 1/2 ton status

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    Pipe thread ... DUH! [​IMG]
     

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