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Technical Model A Diff

Discussion in 'Traditional Hot Rods' started by ‘28 RPU, Apr 4, 2024.

  1. alchemy
    Joined: Sep 27, 2002
    Posts: 22,749

    alchemy
    Member

    Ok. It’s just really hard to picture in my head, since they are the same offset/width hubs as 40 Ford brakes and there have been a million of those done without tires rubbing. Can you snap a photo for me with it all ***embled?
     
  2. BJR
    Joined: Mar 11, 2005
    Posts: 11,341

    BJR
    Member

    It depends on which Lincoln backing plates you use, fronts or backs. Backs have more recess than fronts, if I remember correctly, but I may have that backwards.
     
  3. chickenridgerods
    Joined: Jul 22, 2003
    Posts: 1,551

    chickenridgerods
    Member
    from DSM, IA

    The rear backing plates are the same across all the years of Lincolns; the depth of the fronts are what varied.

    Previous posts have seemed to indicate that he's using reproduction parts from Boling Bros, which use '40 Ford style hubs unless for some reason they do something differently on their Model A kits.

    People have been using '40 hubs (both front and rear) on hot rods for 75+ years w/o tire fitment issues, so who know what's actually going on here.
     
    hotrodfil likes this.
  4. 1946caddy
    Joined: Dec 18, 2013
    Posts: 2,360

    1946caddy
    ALLIANCE MEMBER
    from washington

    You got your posts mixed up. OP did not reference Boling Bros.
    I'm waiting on Boling Bros kit for my conversion.
     
  5. chickenridgerods
    Joined: Jul 22, 2003
    Posts: 1,551

    chickenridgerods
    Member
    from DSM, IA

  6. Grumpy ole A
    Joined: Jun 22, 2023
    Posts: 316

    Grumpy ole A
    Member

    I don’t understand why you don’t just use the v8 diff with the ford juice brakes. They will stop that banger A. It stops my roadster, my aviator. I will find the article a hammer sent me to Id these diffs.
     
  7. Grumpy ole A
    Joined: Jun 22, 2023
    Posts: 316

    Grumpy ole A
    Member

  8. ‘28 RPU
    Joined: Feb 11, 2022
    Posts: 327

    ‘28 RPU

    Grumpy, I guess my answer would be that I already bought over $1,000 in parts for the rear axle. I’m not super eager to give up on them. I can’t return them because I painted them before mock up (lesson learned). What I really need is someone who could supply me with shortened axles. I can narrow the housing myself.
     
  9. ‘28 RPU
    Joined: Feb 11, 2022
    Posts: 327

    ‘28 RPU

    Thanks for the Link Grumpy. This issue is all about width. A Model A axle width the Lincoln brakes is too wide for my truck, a V8 axle is even wider and I’m pretty sure that the ‘4E brakes add as much as the Lincoln brakes do.
     

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