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Thread: DIY Tranny fluid change in an automatic

  1. #1
    Member Pinky's Avatar
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    Default DIY Tranny fluid change in an automatic

    I've looked at a bunch of sites and am getting conflicting information on whether or not you can change the ATF yourself in an automatic C5.

    Has anyone here done it, if so what are the steps? Should the car be running or not when draining the fluid?


  2. #2
    Moderator Toms007's Avatar
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    The best I can do Pinky, is check the FSM when I get home from work. Hopefully someone will chime in here before then.
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  3. #3
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    In some ways, changing the fluid in a C5's automatic is just like doing it in any other auto. You drop the pan, change the filter and pan gasket then refill the trans.

    Only difference is that, since there's no trans dip stick tube with which to fill the trans, you have to refill like you do with a manual. There is a fill plug on the side of the trans which you remove. Through that hole you run your nozzle or tube or whatever it is you use to move the fluid from its container into the trans. When the fluid drips over the bottom of the fill plug hole, the trans is full.

    The final fluid level has to be checked with the engine running, trans in neutral or park and the fluid warm.

    The factory service manual covers the procedure in detail.

  4. #4
    Member Pinky's Avatar
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    THANKS! Mr. Pinky has a project this weekend!

  5. #5
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    To drop the pan it take 5 quarts, a dry unit takes 11 + quarts so all you will be doing is taking the sludge out of the pan. GM pan gasket number 8654799, and I believe they have updated their fluid to a new series. GM has a kit that comes with a magnet to be placed in the pan along with the seal for the filter inlet #8663948. The old seal will have to be pulled from the inside of the pump. The new one can be tapped in place with a proper sized deepwell socket. Pan bolts torque to 97 lbs in, fill plug 21 to 23 ft lbs.

    Good luck
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    C6 has been to 20 states, 49K miles and counting... slowly, more fun driving the '64 and the '72.

  6. #6
    Member Curious George's Avatar
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    Make sure the vehicle is level.

    Also, the vehicle will more than likely be started for awhile to get the transmission fluid up to the proper temperature, which means when you get under the vehicle to fill / check the fluid level, the very hot exhaust will be close to you.

    CG

  7. #7
    Member VETTEX2's Avatar
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    found a simple cheap way to fill the transmission

    this is an easy way to fill it back up

    DON'T LET WHAT YOU CAN'T DO GET IN THE WAY OF WHAT YOU CAN DO!
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  8. #8
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    This is good information to know. Always wanted to do it myself

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