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Tranny pan is killing me

Discussion in 'The Garage' started by sickquad, Oct 17, 2004.

  1. sickquad

    sickquad 1/2 ton status

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    So I'm sick of everyone calling my K5 the Valdeze. The tranny pan leaks bad. It is a 700R4, pretty new cast aluminum pan with the big thick flange. I have been using cork gaskets with both sides siliconed. Any good tricks out there on making a tranny not leak for more than a week or am I just a complete donkey?

    Could I just use silicone? I think it might just get all pushed out though. What about torquing the bolts down without killing the gasket?

    Any advice would help, I know this is a stupid question don't remind me.

    -Chris
     
  2. sled_dog

    sled_dog 1 ton status

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    I'd pull the cover and put it on a nice flat surface see if its really warped or something. Don't see why you can't use all Silicone. I do for most everything.
     
  3. 85burbanator

    85burbanator 1/2 ton status

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    those cork gaskets sucks with silicone. i found out its easier to use just silicone or go by those reusable gaskets. thats my .02
     
  4. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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  5. GMCLegacy

    GMCLegacy 1/2 ton status

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    try checking the bolts after a day or two of install, sometimes the bolts seem to loosen a bit and let the pan start to leak.
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I'd say it's the opposite, stop over tightening them.

    Oh yeah, and stop using silicone entirely on a trans pan.
     
  7. BlueBlazer

    BlueBlazer 1/2 ton status

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    I agree, I would not want that crap inside something with as tight a tolerances as an auto trans. Dry gasket with nothing on it, maybe a little high tack to keep it in place.
     
  8. GMCLegacy

    GMCLegacy 1/2 ton status

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    [ QUOTE ]
    I'd say it's the opposite, stop over tightening them.

    Oh yeah, and stop using silicone entirely on a trans pan.

    [/ QUOTE ]

    its a cast aluminum pan, if he is distorting it, he has other issues.

    and i said check the bolts, not tighten the hell out of them.
     
  9. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    its a cast aluminum pan, if he is distorting it, he has other issues.

    [/ QUOTE ]

    It's not distorting the pan, it's smashing the gasket that I'm worried about.
     
  10. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    torgue spec on the pan bolts are 12 ft lbs, not very tight at all. also no silicone.
     
  11. Poohbair

    Poohbair 1/2 ton status

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    [ QUOTE ]
    I agree, I would not want that crap inside something with as tight a tolerances as an auto trans. Dry gasket with nothing on it, maybe a little high tack to keep it in place.

    [/ QUOTE ]

    Agreed. ATF will eat any of the sealer that squishes to the inside, then it will make its way into your filter and you will have issues. Dry gasket is the only way on a tranny pan.
     
  12. sickquad

    sickquad 1/2 ton status

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    So maybe I'm not that far off. I checked the pan on a surface plate at work, it's definitely flat.

    I was torquing the bolts to 15 ft-lbs.

    When you guys say you don't use cork gaskets, what kind do you use. The paper or fiber type. Neither Summit or Jegs have Fel-Pro tranny gaskets for the 700R4.

    Thanks for the help.

    -Chris
     
  13. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    i use cork gaskets, just don't use silicone on the cork gaskets.
     
  14. jarheadk5

    jarheadk5 1/2 ton status

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    Stupid question time:

    Is the mating surface on the tranny clean of old gasket and old silicone?
     
  15. Storm Trooper

    Storm Trooper 1/2 ton status GMOTM Winner

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    I'll 2nd the Permatex High Tack spray.
    Use any gasket you like and don't over tighten the bolts. Do them all evenly and keep alternating like head bolts etc.
    If you see the gasket start to bulge slightly out of the side, stop! If you really want to be sure it doesn't leak, let it sit overnight before adding fluid and run a nice clean bead of high temp. silicone around the outside after it has setup.
    I never have any leaks with Permatex High Tack, ever.
     
  16. diesel4me

    diesel4me 1 ton status Premium Member

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    I've had good luck with the gaskets that come in the WIX tranny filter kits.I put them on dry--silicone is great for clogging the valve body and other delicate passageways in the tranny--I avoid using it on automatic trannys.If that doesnt cure it--I'd start looking real close for hairline cracks in the tranny case...
    On the subject of gasket sealers--High Tack is good stuff-if you have a rubber floor mat and never want to remove it again it works great to weld them to the steel floor,it works good on other gasket applications too.The most leak proof stuff I've ever used is Permatex"Indian Head"gasket shellac--it comes in a small brown bottle with a dauber brush on the cap like shoe polish--I used it on a radiator hose at the thermostat outlet that was badly pitted,wouldnt stop leaking no matter how tight the clamp was--a little "Indian Head" and it was dry as a bone--a year later I tried to remove the hose to put in a thermostat--had to use a hammer and chisel to get it off!.This stuff even works on carb fittings and other places soaked with gas or diesel fuel--but its a mean bitch to get off after it hardens,even a wire brush on a grinder has a hard time removing it--works good on pipe threads too--but consider anything you use it on to be permanent!. /forums/images/graemlins/crazy.gif
     
  17. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    I'd just go get a new pan (nice alum one if you have the coin) and install one more time using the proper tq. spec.

    -Dan
     
  18. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    we use Wix stuff pretty exclusivly...

    if ya like the indianhead shellac, you should try this "gack" we use called PerfectSeal.. great stuff... kinda like the Permatex 300 series... we slather that stuff on all kinds of applications... /forums/images/graemlins/smirk.gif
     
  19. SUB-ZERO

    SUB-ZERO 1/2 ton status

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    Just changed my filter on my 700r 2 days ago with a rubber gasket no silicone(not good on a tranny!) and just snugged 'em up good(no torque wrench) and it isn't leakin'.Just rechecked the bolts and they are still tight also.
     
  20. jarheadk5

    jarheadk5 1/2 ton status

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    I'll 4th or 5th the Permatex High-Tack - we use it at work for building up transmissions. Works great on cork or paper gaskets.
     

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