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Technical 28/29 vs 30/31

Discussion in 'Traditional Hot Rods' started by ramjet 80, Aug 26, 2020.

  1. ramjet 80
    Joined: Jul 12, 2019
    Posts: 16

    ramjet 80

    What is the difference between a 28/29 Model A frame and a 30/31 frame ???
     
  2. Binger
    Joined: Apr 28, 2008
    Posts: 1,734

    Binger
    Member
    from wyoming

    They are the same.
     
  3. scrap metal 48
    Joined: Sep 6, 2009
    Posts: 6,079

    scrap metal 48
    Member

    What he^^^ said...
     
    lothiandon1940 likes this.
  4. Barn Hunter
    Joined: Feb 15, 2012
    Posts: 1,514

    Barn Hunter
    Member

    The stamped numbers.
     
    LOU WELLS and Beanscoot like this.

  5. Didn't the late 29 have an extended plate on the back of the front cross member?

    Fender and running board brackets are different 28-9/30-1
    There are also two styles of fender and running board brackets for 30-31; early is cast and later are stamped.
     
  6. sloppy jalopies
    Joined: Jun 29, 2015
    Posts: 5,256

    sloppy jalopies
    Member

    later center crossmembers had 2 chunks of steel stamped out of it to form anti-rattle supports for the brake rods... henry saving money...
     
  7. flatford39
    Joined: Dec 3, 2006
    Posts: 2,799

    flatford39
    Member

    The front cross members are different between 28 29 and 30 31 due to radiator heights. Front fender brackets are different as well.
     
    cannuk, acme30, ClarkH and 2 others like this.
  8. Yep. Front crossmember is all you need to watch out for. My stocker 29 had a crossmember replacement at some point. It makes a mess out of hood, grill, & alignment.
     
    low down A likes this.
  9. B Ramsey
    Joined: Mar 29, 2009
    Posts: 646

    B Ramsey
    Member

    i forgot what year had steering box holes on both sides.
     
  10. My ‘28 has steering box holes on both sides


    Sent from my iPhone using H.A.M.B.
     
  11. manyolcars
    Joined: Mar 30, 2001
    Posts: 9,189

    manyolcars

    Nope. I have 10 Model As plus a stack of 7 extra frames and I have many variations of the frames.
     
    -Brent- likes this.
  12. woodiewagon46
    Joined: Mar 14, 2013
    Posts: 2,277

    woodiewagon46
    Member
    from New York

    They might be the same to a hot rodder but to a restorer they are very different. There were four major changes between '28 and '31. The earliest A-5005-A, was only used on about the first 200 cars. A-5005-B, is approximately 4 and 1/2 inches wider than the early frame and had a solid front motor mount. A-5005-C has a different front crossmember, 1/4" lower radiator mount depression. The latest frame A-5005-D has the front body bracket moved 2 and 3/8" rearward. Along with the four major changes there were over two dozen minor changes, such as bolt holes added and removed etc.
     
  13. verde742
    Joined: Aug 11, 2010
    Posts: 6,283

    verde742
    Member

  14. Model A Gomez
    Joined: Aug 26, 2006
    Posts: 1,695

    Model A Gomez
    Member

    The front crossmembers are a little different, the radiator mounting points are at different heights and the early crossmembers were the front motor mount. They will basically interchange, a couple of bolt holes are in different locations.
     
  15. -Brent-
    Joined: Nov 20, 2006
    Posts: 7,361

    -Brent-
    Member

    Most differences aren't of any significance to hot rodding, except for the front crossmember radiator mount pads. Those are the areas where the radiator is fastened.

    The AR front crossmember, the earliest of the As, does have a higher vertical section that may interfere with some hot rodder's set-ups. It can easily be trimmed.

    Running an earlier radiator and shell on a later crossmember, you'll run into it being a tad too low. This is noticeable when running a hood. The 28/29 mount pad areas are higher than the 30/31 cross members and require a shim for the proper height.

    (Edited: Thanks to Dave for catching my flub.)
     
    Last edited: Aug 26, 2020
    stillrunners likes this.
  16. Atwater Mike
    Joined: May 31, 2002
    Posts: 11,624

    Atwater Mike
    Member

    "It's always something." -Rosanna Rosanna Danna
     
  17. scrap metal 48
    Joined: Sep 6, 2009
    Posts: 6,079

    scrap metal 48
    Member

    If you're making a fenderless hot rod, they're interchangeable....
     
    Dino 64 and lothiandon1940 like this.
  18. Mr48chev
    Joined: Dec 28, 2007
    Posts: 33,943

    Mr48chev
    ALLIANCE MEMBER

    Outside of getting the radiator height spot on even if you aren't running a hood. Close only counts in Horseshoes and Hand grenades.
     
    55zephyr and alanp561 like this.
  19. scrap metal 48
    Joined: Sep 6, 2009
    Posts: 6,079

    scrap metal 48
    Member

    50's show rod 002.JPG 100_3569.JPG MR 800 for sale 001.JPG Most change the front crossmember anyway.. At least I always did to get the front lower.. My radiators and grille shells never sat to high....
     
    Last edited: Aug 26, 2020
  20. dwollam
    Joined: Oct 22, 2012
    Posts: 2,345

    dwollam
    Member

    Actually the last two lines are backwards. '28-9 radiator pads on the crossmember are taller. '30-1 pads are lower. If you put an early rad and shell on a '30-31 crossmember they will set too low. However you can always make a shim to make up the distance. '30-1 rad on '28-9 crossmember just sits too high. Talented people may be able to take a 1/4" or so slice out of '28-9 to make it work with '30-1 rad.

    Dave
     
  21. -Brent-
    Joined: Nov 20, 2006
    Posts: 7,361

    -Brent-
    Member

    Yes, Dave, you got it. I was typing it right in my mind, haha.

    Ford changed to the new crossmember in late 1929 with the exception of the overflow hole and shimmed the radiator up. They did this for the remainder of the model year and up until June 1930 on commercial models. I'll correct my post.

    Thanks!
     
    stillrunners likes this.
  22. Once again....the reason for the question?
     
  23. Torana68
    Joined: Jan 28, 2008
    Posts: 1,415

    Torana68
    ALLIANCE MEMBER
    from Australia

    very important question for restorers.
     
  24. Well, I mean, has he got a particular frame or looking for one or body to go with it? Does he have a particular body, or looking for a frame?
    The answer may be "For what you're doing, it doesn't matter."

    But, we're in the dark.
     
  25. Binger
    Joined: Apr 28, 2008
    Posts: 1,734

    Binger
    Member
    from wyoming

    I stand corrected. I forgot about the differences in front cross members. everyone is correct it depends on what your plans are for your build it it matters or not. Body mounts are all the same.
     
  26. Maybe he just wanted to know the difference, great info so far.
     
    scrap metal 48 likes this.
  27. Roger O'Dell
    Joined: Jan 21, 2008
    Posts: 1,150

    Roger O'Dell
    Member

    Cowl from a pillar to hood
     
  28. ramjet 80
    Joined: Jul 12, 2019
    Posts: 16

    ramjet 80

    Thanks guys for all the input, thats alot to take in. I thought I read some ware that 28/29s had elongated holes for the radiator and the 30/31s had round holes. The reason I asked was to try to identify my project. Its a 28/29 roadster pickup but as my frame vin number, when stamped on the engine was 2/24/1930, so the California DMV says it must be registered as a 1930. "Thats Life"
     
  29. 31Apickup
    Joined: Nov 8, 2005
    Posts: 3,378

    31Apickup
    Member

    The 28-29 pickup body style carried over into mid year 1930, so it could still be correct.


    Sent from my iPhone using The H.A.M.B. mobile app
     
  30. sloppy jalopies
    Joined: Jun 29, 2015
    Posts: 5,256

    sloppy jalopies
    Member

    the DAY, MONTH , YEAR are stamped in the '28-'29 tank face... 6" from the left and about 1" up from the seam.
    that is the tank's date of manufacture...
     

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