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tranny pan leaking

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by scrappyk5, Sep 11, 2003.

  1. scrappyk5

    scrappyk5 1/2 ton status

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    my tranny pan gasket was laeking , so i changed it
    with one from auto zone . it was cork .
    well 60 miles later it is leaking again /forums/images/graemlins/angryfire.gif
    is there a better gasket to use or some type of sealant
    i can use with a gasket ?
     
  2. 75-K5

    75-K5 3/4 ton status

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    I would use some Permatex on the new gasket.
     
  3. scrappyk5

    scrappyk5 1/2 ton status

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    is there a certain one you can use on tranny pans?

    i know i tried this once meny years ago on a different vehicle that dissolved and leaked all over
     
  4. 75-K5

    75-K5 3/4 ton status

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    Hmm, well if you have experience with it then you're way ahead of me. I've never had to do this. It makes sense though since ATF is full of detergents it would probably dissolve a lot of foreign material over time. The only other thing I can think of would be RTV. I couldn't tell you which color to use, though. I use blue for my diff cover, but gear oil is different from ATF.
     
  5. 77Jimmy

    77Jimmy 1/2 ton status

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    I had the same problem and replaced mine w/ a felpro -- no more juicy gasket. /forums/images/graemlins/grin.gif

    Here's a thread that might help...

    juicy gasket
     
  6. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Please DO NOT use RTV on a tranny pan. It can squeeze out on the inside and come loose and plug up all kinds of hydraulic circuits in the tranny.

    My .02,
    John
     
  7. 75-K5

    75-K5 3/4 ton status

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    OK, I knew it could do that in the oil pan but I didn't know about the tranny.
     
  8. R72K5

    R72K5 Banned

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    i used copper coat aersol spray, A/Z has the stuff, works great fior tranny pans and rear axles and such, orange can, cant miss it,well worth it.
     
  9. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    always use a felpro gasket never use a cork casket /forums/images/graemlins/eek.gif /forums/images/graemlins/thumb.gif oh and don't over tighten the bolts or you will pinch the gasket and it will leak /forums/images/graemlins/frown.gif
     
  10. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    I have played the tranny pan is leaking game a few times.

    One time it turned out to be the Dipstick O-ring.

    One time it turned out to be a pump O-ring.

    Currenty it's a leaking 1-2 shift acumulator cover O-ring.


    If it looks like it's coming from the front of the pan then drop the inspection cover and look where the pump goes in.
     
  11. scrappyk5

    scrappyk5 1/2 ton status

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    i bought one from the dealership yesturday. an ac delco
    brand. we will see if that solves the problem
     
  12. Lance

    Lance 1/2 ton status

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    If you just replaced, you may need to re-torque all the pan bolts. The cooling and heating of the tranny pan flange area after driving can result in a leak. I had the same problem you're describing. Fixed it by driving the K5 until it hit normal operating temperatures, then I can home and re-torqued all the pan bolts to specifications. No more pan leak.
     
  13. rick88blaze

    rick88blaze 1/2 ton status

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    i use the ones from the dealer. i've never had a problem with them leaking.
     
  14. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    Location:
    Dillon Colorado, Hang'in in the mountains. Renting
    A little spray of Permatex High Tack goes a long way no matter what kind of gasket you have.
    It also really helps to clean all surfaces with a little spray of carb cleaner on a paper towel 1st.
    just my .00572 cents worth. /forums/images/graemlins/smirk.gif
     

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