Gm turbo 350 trans leak
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  1. #1
    Official RnS Addict mikeyboy's Avatar
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    Gm turbo 350 trans leak

    pulled the pan twice to try to cure the leak out of the gasket rail. Put on a new thicker gasket METICULOUSLY installed and still it leaks. I did not put sealer on gasket as I understand you are not supposed to. When the fluid drains down into the pan on turning off the engine it is going to be above the pan gasket surface right? I dont even know if I have the correct dipstick as it was already in the truck when I bought it.Maybe its over full.....any ideas as to why it keeps leaking??
    There's no replacement for displacement.

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    Re: Gm turbo 350 trans leak

    If it is a pressed steel pan it may have "mole hilled" around the bolt holes (dented upwards) try hammering them flat as they will prevent the pan pulling up to the rail properley.
    Yes , fluid will be well above the gasket.
    No longer selling anything Hot Rod related. Not on this site anyway. Don't bother searching Ebay either, they got too greedy.........

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    drag race addict redvictor's Avatar
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    Re: Gm turbo 350 trans leak

    Is it definetely the pan gasket? Like Paul says a cheap steel pan will indent the bolt holes after a few on/off's. Where is it leaking? front,side,back?
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    Re: Gm turbo 350 trans leak

    Just a thought, following redvictors post, have you checked the selector shaft seal? had one leak on my th350 a while ago, oil ran down, soaking the pan and made it look like a leaking gasket.

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    Official RnS Addict mikeyboy's Avatar
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    Re: Gm turbo 350 trans leak

    Its a new pan one of those chrome ones with the drain plug. I trash canned the old steel one as it was leaking out of that too. Could be the selector shaft seal.I'll replace that and see what happens. It looks like its leaking out the front right corner as thats where the puddle on the garage floor is.
    Last edited by mikeyboy; 24-03-2010 at 02:31.
    There's no replacement for displacement.

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    drag race addict redvictor's Avatar
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    Re: Gm turbo 350 trans leak

    If it's right hand looking from the front it could be the seal. You'll need to get the pan off as the selector shaft has to be removed to change the seal. Put loctite on the outside of the seal to stop the oil ingressing past the case.
    Sometimes i've had to put some sealer under the bolt heads to stop silly leaks off the pan gasket. Only a thin bead mind.
    Europe's quickest and fastest street legal car. 4.09 @ 191 - 6.27 @ 237mph so far...
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    Official RnS Addict cabby's Avatar
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    Re: Gm turbo 350 trans leak

    Could it not be the dipstick O ring if its the right hand front corner?

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    Dragging not Bragging vince-305's Avatar
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    Re: Gm turbo 350 trans leak

    Quote Originally Posted by cabby View Post
    Could it not be the dipstick O ring if its the right hand front corner?
    Depends if your in the car or looking at the car from the front Tony but i too was going to say dipstck tube, kick down cable or trans pipes on that side

    I replaced my sump gasket and done the holes with a ball pein hammer and it tuned out to be kickdown hole ( i dont have cable fitted)

    If its on the other side then youve got as Andy has said selector shaft or even speedo cable

    And if its none of those then it could be the rear seal running down the casing before it drips (or is my box to high)
    Bit'z 'N' Piece's
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    Official RnS Addict mikeyboy's Avatar
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    Re: Gm turbo 350 trans leak



    I've pulled those seals before without pulling the pan using one of these nifty tools. The leak is on the right side looking out from inside the car. I may just pull the motor and trans to do it as its very tight in there as its in a Model A with not much room to see anything from under the car.
    There's no replacement for displacement.

  12. #10
    Dragging not Bragging vince-305's Avatar
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    Re: Gm turbo 350 trans leak

    So the leak could be dipstick , kickdown , trans pipes , modulator ? (big round thing on the side) , or the vac unit at the rear then, as from memory there all down that side

    Good luck
    Bit'z 'N' Piece's
    Ford consul mk2 chevy powered highrider

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