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4T60e Transmission leak

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  • #1

    4T60e Transmission leak

    Hello,

    99 Lumina, 3.1l, 4T60E transmission.

    I have an unknown transmission leak location on the drivers side portion of the transmission underneath the car. I looked around the area of the trans pan, and it's difficult to locate the leak. I took the drivers side wheel off, and I still could not tell anything.

    I'm gonna drive it around some and use the cardboard routine to see if I can pinpoint the leak.

    I just wanted to know, besides a leaky trans pan gasket, what gasket, etc. commonly leaks on this side of the transmission? I hope it is not main shaft seal inside the casing where it connects to the flywheel, but I guess that can be a possibility. I've never replaced a seal like that before, and I'm tempted to take it to the trans shop if that is the case.

    Hints appreciated based on your previous experience. Thanks.
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  • #2
    my suggestion would be to completely dry off any fluid that is in the area, wait for the leak to present itself, then follow the trail.

    driver's side.... the side pan is there, not the most horrible thing to get at, but nowhere near as easy as the main pan.
    1995 Monte Carlo LS 3100, 4T60E...for now, future plans include driving it until the wheels fall off!
    Latest nAst1 files here!
    Need a wiring diagram for any GM car or truck from 82-06(and 07-08 cars)? PM me!

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    • #3
      Originally posted by robertisaar View Post
      my suggestion would be to completely dry off any fluid that is in the area, wait for the leak to present itself, then follow the trail.

      driver's side.... the side pan is there, not the most horrible thing to get at, but nowhere near as easy as the main pan.
      To add to what Robert said, take it to a car wash and get the trans as clean as you can. This will make it much easier to locate the leak.

      Sent from my HTC One X using Tapatalk 2
      -60v6's 2nd Jon M.
      91 Black Lumina Z34-5 speed
      92 Black Lumina Z34 5 speed (getting there, slowly... follow the progress here)
      94 Red Ford Ranger 2WD-5 speed
      Originally posted by Jay Leno
      Tires are cheap clutches...

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      • #4
        Check the feed and return lines for the cooler.
        Lifting my front wheels, one jack at a time.

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