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Technical 1940 Ford u-joint

Discussion in 'Traditional Hot Rods' started by Thomas Green, Dec 10, 2025.

  1. Thomas Green
    Joined: Dec 12, 2022
    Posts: 32

    Thomas Green

    I have just recently removed my transmission while the engine gets rebuilt. I think the transmission has been rebuilt, but seeps fluid around the shift forks (slightly) so I’m replacing those seals. The u-joint has some up/down play as shown in the video, is this normal? How much grease is used after ***embling the clam shells? I take it there is no one piece seal on the rear of the transmission, correct?
     
  2. alchemy
    Joined: Sep 27, 2002
    Posts: 23,021

    alchemy
    ALLIANCE MEMBER

    The X on the joint is supposed to slide in its bushings. It’s not supposed to rock. Make sure you understand what you have happening.

    Pack as much grease as you can around the X before you ***emble the inner cone or the outer shell. Lots of guys use John Deere corn head grease here.

    No seal on the back of the transmission, but some guys will now use a sealed bearing at the output shaft.
     
  3. rusty valley
    Joined: Oct 25, 2014
    Posts: 4,424

    rusty valley
    Member

    I take the speedometer turtle off, then pump grease in the clam shell zerk until I see it filling the speedo drive area.
     
    TERPU likes this.
  4. wheeltramp brian
    Joined: Jun 11, 2010
    Posts: 3,430

    wheeltramp brian
    Member

    There Is a sealed bearing type u joint You can buy nowadays and use that with the sealed rear bearing and no grease is needed
     
  5. 19Fordy
    Joined: May 17, 2003
    Posts: 8,404

    19Fordy
    Member

    I filled the clamshell with John Deere grease until I saw the grease ooze out of the speedometer turtle opening. Then I knew it was full. Also used the newer clam shell seal with the 0-Ring. Lots more info in this thread:
    Clam shell help - The Ford Barn
     
  6. Thomas Green
    Joined: Dec 12, 2022
    Posts: 32

    Thomas Green

    Thank you!
     
  7. Thomas Green
    Joined: Dec 12, 2022
    Posts: 32

    Thomas Green

    Thank you!
     
  8. Thomas Green
    Joined: Dec 12, 2022
    Posts: 32

    Thomas Green

    Thank you!
     
  9. Thomas Green
    Joined: Dec 12, 2022
    Posts: 32

    Thomas Green

    I just checked out another guys ujoint and figured out I’m missing the clips in the ujoint!
     
  10. alchemy
    Joined: Sep 27, 2002
    Posts: 23,021

    alchemy
    ALLIANCE MEMBER

    There are clips that hold the bushings into the two large halves of the joint, but the center X is still supposed to slide loosely in the middle. It’s different than any other joint I have seen.

    A photo would help us confirm what you have.
     
    seb fontana and Moriarity like this.

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