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  • C3 4-speed transmission leak
  • C3 4-speed transmission leak
  • C3 4-speed transmission leak
  • C3 4-speed transmission leak

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  1. #1
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    Default C3 4-speed transmission leak

    I have77 with a 4-speed transmission. I took the car to a Corvette mechanic in Orlandoand paid them to take care of oil and transmission leaks. I returned the cartwice because it still leaked. I was later informed by the owner that all C3sleak and canít be fixed. I was also told to ďjust keep the transmission fluidtopped off, which I am sure you know requires the car to be jacked up or on alift. The questions I gave are: is this true, all C3 manual transmissions leakand canít be repaired? When I inquired about replacing the 4-speed with a5-speed I was told it would cost $8k and even a new transmission would stillleak. Is it really impossible to fix the leak? Thank you for any comments andsuggestions

  2. #2
    Moderator bill81vette's Avatar
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    NO! where is it leaking from???has he replaced any seals????
    probably a worn shaft that won't seal.he should have put a sleeve on the shaft where it is leaking from.
    I would find a new mechanic.
    if your mechanically inclined,do it your self.
    Bill and Gail...save the wave
    NCRS member 42415
    1981 St.Louis car #2735
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    born Sept 18,1980
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  3. #3
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    I had a feeling I would be told to get a new mechanic. The mechanic did tell me the leak was due to a worn shaft. I am not able to remove the transmission, so I need to find a mechanic/shop in the Orlando, Florida area to fix the leak. Do I simply tell the new mechanic to install a sleeve? Can most any transmission shop make this repair? Please let me know if anyone knows where I can take it for the repair. Thanks again!

  4. #4
    Moderator bill81vette's Avatar
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    check around the area at transmission shops to see if they have would be able to repair the leak for you.
    good luck!!
    Bill and Gail...save the wave
    NCRS member 42415
    1981 St.Louis car #2735
    all matching numbers

    born Sept 18,1980
    Cruisefest 2008
    Cruisefestous 2009
    Cruisefest 2010
    Cruisefest 2011
    Cruisefest2012



    Without Trucks......
    You would be Hungry,Homeless and Naked!!!!!!



  5. #5
    Administrator Tom Bryant's Avatar
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    It would be the input shaft more than likely. NAPA sells a repair sleeve for that. They also sell sleeves for the shifter shafts but usually new o-rings will fix them. The rear would be a sleeve for the driveshaft yoke if that's where it's leaking. There is no reason to accept a leaking 4 speed as just the way they are because it isn't. I have never had a leaking Muncie or B-W. I have put front, rear and shifter shaft seals in some for friends though when we replaced syncro blocker rings or gears.

    I see there is an active Corvette club in Orlando. You might try contacting them to see who their members use. Also google transmission shops. There are a bunch that pop up. Check their reviews and call the ones with the highest ratings and talk to them about your leak.

    Tom
    NCRS 1360.............SACC 2082.............C1 Registry..............L81 Registry
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    1959 Chevrolet Corvette 1981 Chevrolet Corvette , 350 L81 automatic Frost Beige

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