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Technical 39 Ford drive shaft shorting - is this good?

Discussion in 'Traditional Hot Rods' started by cederholm, Dec 11, 2023.

  1. cederholm
    Joined: May 6, 2006
    Posts: 1,748

    cederholm
    Member

    So I shortened my drive shaft for my '28 build. Everything fits well, but I want a second set of eyes. According to Tardel, the driveshaft should be just a little shorter than the tube, about 1/16' I think. Mine is just a hair longer. And since I don't have the speedometer gear housing (yet) I can't check the gear positioning. Any insight? .

    [​IMG]

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  2. j ripper
    Joined: Aug 2, 2006
    Posts: 847

    j ripper
    Member
    from napa ca.

    What was it before disassembly?
     
  3. cederholm
    Joined: May 6, 2006
    Posts: 1,748

    cederholm
    Member

    A full size 1939 drive shaft and torque tube. I forgot to measure the end at the time I didn't have the speedo gear.

     
  4. rusty valley
    Joined: Oct 25, 2014
    Posts: 3,921

    rusty valley
    Member

    Every rear end I've had have had the drive shaft extend beyond the bell by about 1/16 to 1/8". The splines will end up flush with the edge of the bell, and the tapered end sticks out a bit.
     
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  5. BJR
    Joined: Mar 11, 2005
    Posts: 10,531

    BJR
    Member

    Make sure you put the snap ring on to hold the speedometer drive gear in place.
     
    cederholm likes this.
  6. j ripper
    Joined: Aug 2, 2006
    Posts: 847

    j ripper
    Member
    from napa ca.

    Sorry, I meant the length of shaft before disassembly.
     
  7. IronTrap
    Joined: Jul 13, 2011
    Posts: 518

    IronTrap
    Member

    The front of the driveshaft is fool-proof since it is all locked in place by the orientation and stack up of the bearing, thrust washer, speedo gear and the c-clip. Install all of that and it sets the front of the driveshaft where it needs to be.

    The rear of the driveshaft I usually measure before I take it apart but you could measure the distance from the star mounting flange surface and the rear face of the driveshaft sleeve when mounted with no torque tube by placing the rivet/pin back in.

    It looks to me from the photos you don’t currently have the C-clip installed at the front of the speedo gear.
     
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  8. cederholm
    Joined: May 6, 2006
    Posts: 1,748

    cederholm
    Member

    Helpful, thanks! Yes, I still need to install the clip, this is just a test fit. Any tips for removing the bearing and seal for replacement? ...although it doesn't look worn.

     
  9. ydopen
    Joined: Mar 14, 2010
    Posts: 237

    ydopen
    Member

    here is one way to remove race.
    removing-the-race.pdf
    Also there is a simple tool made From a piece of pipe
    . Here it is

    John
     
    Last edited: Dec 12, 2023
    cederholm likes this.
  10. cederholm
    Joined: May 6, 2006
    Posts: 1,748

    cederholm
    Member

    Very helpful, thank you!

     
  11. BJR
    Joined: Mar 11, 2005
    Posts: 10,531

    BJR
    Member

    I used a long piece of pipe and a hammer to drive the seal and bearing out. It came out very easy.
     
    cederholm likes this.

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