Register now to get rid of these ads!

Hot Rods model a vs 46-48 Ford rear end

Discussion in 'The Hokey Ass Message Board' started by TheTumbleweeds, Nov 6, 2014.

  1. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    Hi all,

    Im thinking of a Ford 46-48 rear axle, witch have Open drive, on my model a, to meet a 265chev with 3speed...

    is there something to think of?
    I ve found one axle close to me, with model a "brackets" welded on.

    Do I need like ladderbars or something else?

    (trying upload pic of axle)

    Hhappy for advice and Pictures on simular installation

    Many thanks
     
  2. patmanta
    Joined: May 10, 2011
    Posts: 3,678

    patmanta
    ALLIANCE MEMBER
    from Woburn, MA
    1. MASSACHUSETTS HAMB

    If it's open drive, wouldn't that be out of a F1 truck, not a car? The F1's were set up for parallel leaf springs and have mounts for them. The one you're looking at may have had these ground off. Does it have the spring hangers from a passenger car on either end or vestiges thereof?

    Ladder bars are an option, but a set of rear rods with a torque arm is another option. That's what I'm planning to do with mine.

    Something to consider though is that the 46-48 rear ends are wider, so you may want to take some measurements.
     
  3. patmanta
    Joined: May 10, 2011
    Posts: 3,678

    patmanta
    ALLIANCE MEMBER
    from Woburn, MA
    1. MASSACHUSETTS HAMB

    http://www.hotrodworks.com/project_vehicles_view.asp@carid=46.html

    Rear Axle drum to drum width:
    NOTE: These width dimensions where measured with 1940 style brakes. Mechanical brakes may differ.
    Year Width Spring mount eye to eye

    1928-1931 57.0" 49.5"
    1932-1934 57.75" 47.5"
    1935-1936 59.5"
    1937-1941 59.5" 48.5"
    1942-1948 61.0"
     
  4. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden


  5. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    Its from a pu, and had two springs, but those are gone now, and there is welded brackets for model a spring.
     
  6. patmanta
    Joined: May 10, 2011
    Posts: 3,678

    patmanta
    ALLIANCE MEMBER
    from Woburn, MA
    1. MASSACHUSETTS HAMB

    Measure the distance between the eyes on the brackets and take not of the measurement; it could be anything, but is likely set up for a Model A spring. The width of the rear as per HRW's measuring method should be 61" unless someone modified and narrowed this rear which I doubt. It's probably a 4:10 ratio, but could be something else.

    I'd just buy it if the price is right. You can always trade or sell it on if you decide you can't make it work.
     
  7. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    I think this is a stronger than stock Model a? Is it too Wide for an model a?
     
  8. flathead okie
    Joined: May 22, 2005
    Posts: 1,480

    flathead okie
    Member

    the model a in my avitar has the 46 f1 pu rear in it. I didn't run fenders.
     
    AModelRobinson and patmanta like this.
  9. AVater
    Joined: Dec 9, 2008
    Posts: 2,468

    AVater
    ALLIANCE MEMBER
    1. Connecticut HAMB'ers

    As patmanta noted, without the torque tube present in the open drive unit, using the cross spring you should have a torque arm in place as radius rods alone likely won't hold it properly from twisting.
     
    patmanta likes this.
  10. 1oldtimer
    Joined: Aug 21, 2003
    Posts: 7,892

    1oldtimer
    ALLIANCE MEMBER

    The stock model A rear is pretty weak and really weak with a SBC. You can mix and match parts to get it close to model A width and have a stronger center. Right now I have '35/'36 axle bells, '41 axle shafts, a center from a '46 truck and it's about 1/2" wider then a model A. The stock rear spring (or a T spring) fits using a bolt on hanger, a modified model A spring perch (someone on here is selling a made one).
    [​IMG]
    [​IMG]
     
    TheTumbleweeds and patmanta like this.
  11. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    Nice mix of parts you have there!
    well, I think I buy the axle, and measure the hole wide, and goes on from that point. This has been made for an model a, so maybe, maybe it has been modified.

    I have couple of model a perches, I could modify, realy nice sollution there!
     
  12. I have a '48 Mercury rear end under my Roadster in my picture, much to what others say about them being too wide i don't really think so.. and over here by law we have to have safety wheels.. so when i put my '40 wheels in to get the centers pulled and welded into new hoops i'll have them add an inch of backspacing.

    I also used the above pictured method to create a spring over setup, however between the backing plate flange and the hanger i used a 1" spacer which gives you the same shackle distance as an original Model A.
     
    patmanta likes this.
  13. patmanta
    Joined: May 10, 2011
    Posts: 3,678

    patmanta
    ALLIANCE MEMBER
    from Woburn, MA
    1. MASSACHUSETTS HAMB

    Oh, I just saw that you're in Sweeden. You should definitely buy that rear end in that case. I would imagine old Ford parts are quite a bit more scarce over there and it WILL work for your build, particularly if you're going fenderless.
     
  14. 1oldtimer
    Joined: Aug 21, 2003
    Posts: 7,892

    1oldtimer
    ALLIANCE MEMBER

    I should have noted that I'm staying close to a model a width because I'm running fenders, if it's fenderless then width isn't too much of a problem. But I would get it just for the center if nothing else.
     
    patmanta likes this.
  15. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    Im shooting for fenderless, so thats no problem ;-)

    Hey, Im picking up this axle today! I get back with some more pics and measurements

    REALY Good answers and inputs from u guys!
     
  16. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    The rear end is mine now! And I have measured center to center , and have like 48,5" , hopefully will that work to my model A spring. The axle seems really nice, I just LOVE these old banjos! DSC_2026.jpg
     
    patmanta likes this.
  17. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    Ahh, it was Nice detail for my hotrod build
     
  18. Stock A was 49-1/2"; but 48-1/2" works OK too.
     
  19. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    Okay, seems good! Nice upgrade I think :)
    then maybe build lake headers with Model A stock tubes ;-)
     
  20. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    A set of rear rods with a torque arm? Do you have an example of this sollution? I just love when front v-bars (?) almost meet rear v-bar in the middle of chassie
     
  21. patmanta
    Joined: May 10, 2011
    Posts: 3,678

    patmanta
    ALLIANCE MEMBER
    from Woburn, MA
    1. MASSACHUSETTS HAMB

    What do you mean by "v-bar"?
    Are you talking about the radius rods/wishbones? I was referring to rear radius rods. A torque arm is a third member added to the Ford style rear radius rod setup when there is no torque tube or parallel leaf setup. If you search the HAMB or Google it, you should come up with many instances and variations. In essence, you use a bracket to bolt a rod that goes from the rear end to the center crossmember. It should share a similar pivot point to the rear radius rods.
     
  22. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    Wishbones.. Thats the Word I couldnt find ;-) okey, I google it in HAMB,

    Thanks man
     
    patmanta likes this.
  23. 1oldtimer
    Joined: Aug 21, 2003
    Posts: 7,892

    1oldtimer
    ALLIANCE MEMBER

  24. TheTumbleweeds
    Joined: Jul 29, 2010
    Posts: 536

    TheTumbleweeds
    Member
    from Sweden

    Just some machining left, but the mounts is "made" , :) DSC_3177.jpg DSC_3178.jpg DSC_3179.jpg DSC_3181.jpg DSC_3184.jpg
     
  25. CGkidd
    Joined: Mar 2, 2002
    Posts: 2,865

    CGkidd
    Member

    Great tech info. I like the info on mixing and matching the parts. Thanks

    Sent from my E6810 using The H.A.M.B. mobile app
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.