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Technical Open drive axle.

Discussion in 'The Hokey Ass Message Board' started by cody1958, May 5, 2018.

  1. cody1958
    Joined: Sep 19, 2006
    Posts: 828

    cody1958
    Member
    from wichita ks

    Screenshot_20180505-155932.png I own a 40 truck banjo. Wanting to convert to open drive. (minus the expensive adaptors.) I found this one which is a 47-48 I believe will the open drive Bolt over onto my 40. Also what do I look for and is 150 to high
     
    chryslerfan55 likes this.
  2. 19Fordy
    Joined: May 17, 2003
    Posts: 6,857

    19Fordy
    Member

    The wheel mounting surface to opposite wheel mounting surface distance on a 40 Ford rear is 59 1/2 in. Compare that with yours. I think it's too wide. Unscrew the fill plug and check condition of gears. Also, be sure it's has a gear ratio you desire. 3:78 is the most common. 3:54 is hard to find. 4:11 is not a good highway gear. Gear ratio should be stamped on the center rib of center section below the drive shaft. Divide the little number into the big number to calculate ratio. Read this.
    https://www.fordbarn.com/forum/showthread.php?t=163427
    $150 is a fair price if the rear is good, if the backing plates have all the brakes and hardware and if the drums have not been turned more than .060 in. Stock drums measured 12.000 in.
     
    Last edited: May 5, 2018
  3. Budget36
    Joined: Nov 29, 2014
    Posts: 3,589

    Budget36
    Member

    150 is a good price, considering a kit (if you can't do machine work) is around 300 as I recall, to convert yours to open drive.
     
  4. Andy
    Joined: Nov 17, 2002
    Posts: 4,594

    Andy
    Member

    The truck rears had special gears. You can't just put pass gears in them. I would use 40 bells and axles if I was building a 40.
     
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  5. Listen to Andy........

    Around here the open rears are going for almost as much as the open kit.
     
    cody1958 likes this.
  6. cody1958
    Joined: Sep 19, 2006
    Posts: 828

    cody1958
    Member
    from wichita ks

    I have a rear axle that's a 40. Just wanting to switch the open drive (only) from the 48 to the 40. That's it. No gear chamge
     
  7. King ford
    Joined: Mar 18, 2013
    Posts: 1,361

    King ford
    ALLIANCE MEMBER
    from 08302

    yes but the open drive pinion that accepts the u joint yolk is different than the closed drive pinion so you have to run the ring and pinion that are in the open drive axle.if they are in good shape and a ratio you desire just swap the ring gear onto your current differential carrier and use the complete open drive center section.....preload and backlash will need setup also.
     
    cody1958 likes this.
  8. butch27
    Joined: Dec 10, 2004
    Posts: 2,827

    butch27
    Member

    Only made THAT rear for about 3 years and most were 4:11 I have one in the bucket
     
    patmanta likes this.
  9. patmanta
    Joined: May 10, 2011
    Posts: 3,549

    patmanta
    ALLIANCE MEMBER
    from Woburn, MA
    1. MASSACHUSETTS HAMB

    40 is narrower but depending on what you're trying to do and what with it may not matter.
    $150 is about $300 too light on that rear end with the brakes, all clean, painted, with cables like that.
    Around here, those open drive rears run $200 to $250 rusty, dirty, and bare.
     

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