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Technical 9” 3rd member

Discussion in 'The Hokey Ass Message Board' started by Firedup, May 18, 2019.

  1. saltflats
    Joined: Aug 14, 2007
    Posts: 9,120

    saltflats
    Member
    from Missouri

    CAC9128D-44CD-4799-8D28-5639B7A34CBB.jpeg
    Don't look like race car stuff to me.
     
  2. deathrowdave
    Joined: May 27, 2014
    Posts: 1,431

    deathrowdave
    ALLIANCE MEMBER
    from NKy

    If you clean the ring gear better close to the location you have in the photo , the teeth count will be posted on the ring gear of both gears . As others have stated you are looking at probably a 3.00 or near ration . That is what I run in my 32 , for fuel mileage . It doesn’t take a lot of gear to make a 2900 lb car move .
     
  3. Firedup
    Joined: Feb 2, 2018
    Posts: 116

    Firedup
    Member
    from Oregon

    I got a count on the ring gear. 44 teeth, and on the pinion gear it was kind of hard to count by myself but I came up with 10. That means 44-10 which would be a 4.44 ratio? That is what the guy advertised it as. He also did advertise it as 28 spline.
     
  4. big duece
    Joined: Jul 28, 2008
    Posts: 5,403

    big duece
    Member
    from kansas

    Take the 4 main cap bolts out and gain full access to the pinion OR, black magic marker one tooth and count...
     
    Firedup likes this.
  5. gimpyshotrods
    Joined: May 20, 2009
    Posts: 15,885

    gimpyshotrods
    Member

    Based on the number of teeth that I can see, and the spacing, I get way more than 10.

    I would pull the pinion support and get a real count.

    upload_2019-5-18_20-47-41.png
     
    Firedup likes this.
  6. You can pop the pinion gear out the front by unbolting the pinion housing; just keep track of any shims you find and reinstall them.

    With that ratio and 28 spline axles, it's probably out of a six-cylinder truck, maybe 4WD.
     
    Firedup likes this.
  7. Firedup
    Joined: Feb 2, 2018
    Posts: 116

    Firedup
    Member
    from Oregon

    Thanks fellas. You guys know your stuff :D
     
  8. RmK57
    Joined: Dec 31, 2008
    Posts: 853

    RmK57
    Member

    I'd say someone has thrown in another ring gear to get that 4.2 ratio. Going by the case and differential casting numbers which probably are original dont seem to jive with ring gear number.
    Eh, it's not the end of the world. Set it up and use it. The worst that can happen is it will pull the whole pinion support out when you launch or snap and axle.:D
     
    raven likes this.
  9. 41rodderz
    Joined: Sep 27, 2010
    Posts: 2,080

    41rodderz
    Member
    from Oregon

    I have bout a couple with mid 3 gears at $30 a piece. You would have been better off maybe going to a wrecking yard. At least they might have checked the ratio and you could of gotten the whole axle.
     
  10. There is 45-12 = 3:75 and 43-10 = 4:30 but I don't see a ring gear at 44 teeth.
     
  11. alphabet soup
    Joined: Jan 8, 2011
    Posts: 1,241

    alphabet soup
    ALLIANCE MEMBER

    Funny, was just looking at my Hollander book this morning. Was looking for 9" ratios. As per them.
    4.44=9-40...4.30=10-43...3.91=11-43 and the only one with a 44 tooth ring gear is 2.75 16-44. This is a '75 edition. So there may be others after this. Gene.
     
  12. big duece
    Joined: Jul 28, 2008
    Posts: 5,403

    big duece
    Member
    from kansas

    Now you can build a Bonneville car around the third member...
     
    Johnny Gee likes this.
  13. OLDSMAN
    Joined: Jul 20, 2006
    Posts: 1,517

    OLDSMAN
    Member

    I had an 8" in my 1939 Deluxe Ford. It had a 3.55 gear ratio. It was out of a Pinto wagon with a V-6 and standard transmission
     
  14. The 2 most common ratios in the early 67-77 bronco are 4.11 for 6 cyl and 3.50 for V8's

    To the original poster you could slide an axle in it and count the revolutions to figure out the ratio. I thought you might have had Motive gears because they have some odd ball ratios but even they don't have a 4.40
     
  15. I've never paid much attention to the thicknesses of ring gears but for what it's worth the first is a 3.50 and the second is a 3.25 20190519_213103.jpg 20190519_215213.jpg
     
  16. I was just out in the shop looking at a 9 inch. 35 teeth on ring gear and 10 on the pinion. =350.
     
  17. Firedup
    Joined: Feb 2, 2018
    Posts: 116

    Firedup
    Member
    from Oregon

    Yes I got hosed. 2.75 ratio. I got one if anyone’s looking. Ha ha.
     
  18. big duece
    Joined: Jul 28, 2008
    Posts: 5,403

    big duece
    Member
    from kansas

    Does it have the large or small carrier bearings?
     
  19. Firedup
    Joined: Feb 2, 2018
    Posts: 116

    Firedup
    Member
    from Oregon

    I don’t know to be honest.
     
  20. LWEL9226
    Joined: Jul 7, 2012
    Posts: 239

    LWEL9226
    Member
    from So. Oregon

    Where in Ore are you located???

    LynnW
     
  21. Firedup
    Joined: Feb 2, 2018
    Posts: 116

    Firedup
    Member
    from Oregon

    Near Oregon City.
     

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