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Technical 9” Rear end identification

Discussion in 'The Hokey Ass Message Board' started by Kustom Fabricator, Aug 16, 2021.

  1. Kustom Fabricator
    Joined: Jul 4, 2010
    Posts: 93

    Kustom Fabricator
    Member

    DA4DF599-5568-4865-B195-8FB149375F1D.jpeg A90298BF-912B-413B-B34F-07CFE4C8F1C4.jpeg Trying to get some gears for what I thought was a 9”. I have always thought if you have to use a box wrench to remove the lower 3rd member bolts that was a quick way. Reputable company told me ford never made a smooth dish back 9”.

    Any help appreciated.
     
  2. 19Fordy
    Joined: May 17, 2003
    Posts: 7,298

    19Fordy
    Member

    Hotrodmyk, lo c dan and Deuces like this.
  3. Boneyard51
    Joined: Dec 10, 2017
    Posts: 5,175

    Boneyard51
    Member

    stillrunners and sidevalve8ba like this.

  4. Is there a identification tag? HRP

    [​IMG]
     
    Last edited: Aug 16, 2021
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  5. woodsnwater
    Joined: Apr 4, 2016
    Posts: 496

    woodsnwater
    Member
    from North Al.

    1957-1959 Ranchero and station wagon
    57.25 inches
    narrowest 9" housing
     
  6. Kustom Fabricator
    Joined: Jul 4, 2010
    Posts: 93

    Kustom Fabricator
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    Deuces likes this.
  7. Kustom Fabricator
    Joined: Jul 4, 2010
    Posts: 93

    Kustom Fabricator
    Member

    No Tag...
     
  8. My 9 inch out of a 1959 Edsel is smooth backed like your picture. I think they were like this from 57-59, had two dimples from 60 to 66, and a raised section for the ring gear from 67 up. Early models also had drain plug in the housing. Some had a fill plug in the rear. Later models had the fill plug in the carrier.
     
    55styleliner and Deuces like this.
  9. What is axle under.

    This is a 9" from under a '57 Ford. HRP

    [​IMG]

    [​IMG]

    [​IMG]
     
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  10. Kustom Fabricator
    Joined: Jul 4, 2010
    Posts: 93

    Kustom Fabricator
    Member

    55 Ford...

    But after looking at it again I agree with Sidevalve that it is a 9" out of a 57.

    Thanks all for responding
     
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  11. Kustom Fabricator
    Joined: Jul 4, 2010
    Posts: 93

    Kustom Fabricator
    Member

    Some info I found from the ranger station...After double checking the rear of the axle housing it does not have a perfect dished rear cover, it for sure has a 2" flat band running from top to bottom that you cant see in the pictures which is why it might have been hard for the reputable company to identify, also it's 1 year only so I'm sure a lot of people have not seen it before.

    Thanks again everybody for the help.

    How To Recognize 9-Inch Housing Centers:

    • 1957 - no dimples, flat center band up the center of the rear cover, bottom drain plug

    • 1958-1959 - two dimples on back of housing, flat center band, some had drain holes

    • 1960-1967 - two dimples, flat center band, oil level hole in back cover

    • 1963-1977 Lincoln, LTD, Thunderbirds had 9.375 inch centers, housings were cut away at the gasket surface for ring gear clearance, one curved rib at the front top portion of differential, strong but no gears

     
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  12. Marty Strode
    Joined: Apr 28, 2011
    Posts: 6,087

    Marty Strode
    Member

    Ranchero and wagon have large axle bearings, quick way to tell is 1/2" backing plate bolts, all others are small bearing, 3/8" bolts.
     
  13. squirrel
    Joined: Sep 23, 2004
    Posts: 49,795

    squirrel
    Member

    I think that's the predecessor to the 9"...the Ford rear used from 49-56 in regular passenger cars (not trucks, wagons, or Tbirds). You can tell by the round shape, not oval.
     
    Deuces and Crazy Steve like this.
  14. Yep, that's a 49-56 rear axle. The other giveaway is the u-joint flange, that style u-joint disappeared in '56 also.

    The '57-58 9" housing had drain plugs, those were gone after that. Ford went back and forth on the case/housing fill, with housing fill being more common in trucks for some reason, but certainly not exclusive to them. The smooth back /case fill type was mostly '57-58, but housing fill smooth backs existed into the mid-60s. At one time I thought it may have something to do with whether the housing was a small bearing or big bearing axle housing as housing fill seemed to be more prevalent on big bearing housings. I don't recall seeing a dimpled housing fill, those were all smooth-back.

    The one the OP shows is very probably a '57-59 small bearing housing, no drain plug rules out the '59. That's a WAR case for sure.
     
  15. jaracer
    Joined: Oct 4, 2008
    Posts: 1,221

    jaracer
    Member

    That isn't a 9 inch center section. All 9 inch differentials have a removable pinion bearing retainer.
     
  16. 51504bat
    Joined: May 22, 2010
    Posts: 3,022

    51504bat
    ALLIANCE MEMBER

     

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