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Technical Flathead 39 style trans help

Discussion in 'The Hokey Ass Message Board' started by novaskilling, Aug 20, 2026.

  1. novaskilling
    Joined: Jul 8, 2018
    Posts: 174

    novaskilling

    Have a closed drive 39 style trans that I fully rebuilt all new bearings new synchros new detents etc. been driving it a year now and lately it’s giving me some issue. Sometimes when I go to shift into second from first it’s like I hit a wall and can’t get into second. If I release the clutch and press it in again usually it’ll go fine. Sometimes it does it going into reverse. Any suggestions or help please? Throw out and clutch/pressure plate were also done with the trans. Free play is roughly 1-1/8”
     
  2. krylon32
    Joined: Jan 29, 2006
    Posts: 11,757

    krylon32
    ALLIANCE MEMBER
    from Nebraska

    65 years ago when I started to drive and old Ford my dad told me I had to learn the double clutch to go from 1 to 2?
     
  3. RAK
    Joined: Jul 15, 2011
    Posts: 215

    RAK
    Member

    Sounds like you might need a clutch adjustment….
     
  4. 51504bat
    Joined: May 22, 2010
    Posts: 6,085

    51504bat
    ALLIANCE MEMBER

    A properly working '39 trans doesn't need to be double clutched from 1st to 2nd.
     
  5. TCTND
    Joined: Dec 27, 2019
    Posts: 855

    TCTND
    Member

    The '39 coupe I had in 1963 ate a rebuilt trans because someone had neglected to insert the hemispherical thrust "washer" between it and the torque tube.
     
  6. alchemy
    Joined: Sep 27, 2002
    Posts: 23,465

    alchemy
    ALLIANCE MEMBER

    I don’t know how to double clutch and my sedan has 10,000 miles on the latest transmission, built by me. If you follow the Mac VanPelt book to the letter, you’ll be golden.
     
    Tim and alanp561 like this.
  7. Duke
    Joined: Mar 21, 2001
    Posts: 937

    Duke
    Member

    Clutch adjustment or the grease from the u-joint has made its way into the transmission. The other issue could be the ball on the end of the shifter is worn and needs to be built up.
     
  8. J. A. Miller
    Joined: Dec 30, 2010
    Posts: 2,460

    J. A. Miller
    ALLIANCE MEMBER
    from Central NY

    What gear oil did you fill it with? GL-4 or GL-5?
     
  9. Kiwi 4d
    Joined: Sep 16, 2006
    Posts: 4,064

    Kiwi 4d
    ALLIANCE MEMBER

    ‘Double clutch is only for old trucks really with constant mesh gears. Clutch Into neutral , clutch and into the next gear.
     

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