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Model T vs. Model A spring width

Discussion in 'The Hokey Ass Message Board' started by racemad55, Feb 2, 2008.

  1. racemad55
    Joined: Dec 14, 2005
    Posts: 1,072

    racemad55
    Member

    Installing a frankland Q/C. rear, seems the hangers will hit my buick backing plates unless I have a narrower model A main leaf made.My question is a model T rear spring narrower than an A ?
     
  2. racemad55
    Joined: Dec 14, 2005
    Posts: 1,072

    racemad55
    Member

    Jetmek,are you among the missing? You must have these measurements in your head. Rick
     
  3. A Chopped Coupe
    Joined: Mar 2, 2004
    Posts: 1,133

    A Chopped Coupe
    Member

    Don't know the length of a T spring, but the shackle to shackle distance for a stock Model A
    (these are center of shackle mt to center of shackle mt) is 49-1/4".
    I have a Halibrand and had to move my shackles in towards the center of the housing 1" on each side to clear my Wilson Welding backing plates on Buick drums. I had to have a new main leaf made..............................
     

    Attached Files:

  4. The37Kid
    Joined: Apr 30, 2004
    Posts: 17,710

    The37Kid
    Member

    The shackel to shackle length can vary based on how you spread the leaves apart. The width of the spring leaves and the spring pocket in the crossmember differs T to A, the T is narrower, stock T rear is 2 inches, so a T in an A crossmember needs shims to center it in the pocket.
     
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  5. Bib Overalls
    Joined: Aug 3, 2001
    Posts: 3,849

    Bib Overalls
    ALLIANCE MEMBER

    I thought the spring perches on a Model A rear axle were 48.5" apart center of eye to center of eye. Posies makes a spring that fits perches that are 46.5" apart. And Speedway sells a narrower spring as well.

    The Posies spring has a silghtly different shape that gives a quick change more clearance.
     
  6. racemad55
    Joined: Dec 14, 2005
    Posts: 1,072

    racemad55
    Member

    Thanks guys, I did buy a speedway spring,didn't compare it to my original yet. A chopped,did you get the skeleton backing plates? Was wondering about the T spring because that's what the rolling bones use to help lower there builds,I don't want to c-notch the frame.
     
  7. A Chopped Coupe
    Joined: Mar 2, 2004
    Posts: 1,133

    A Chopped Coupe
    Member

    racemad55,

    Bib Overalls, the stock Model A shackle dimension eye to eye is 49.125 to 49.225.....always
    has been at least on 30/31 A's.

    Since I am running 45 fin Buick drums front and rear I actually bought Wilson Welding's aluminum backing plates.

    Give me more information on the frame........mine was z'd in the rear 3" for more a nostalgic look. My Halibrand is 60" wheel mounting surface to wheel mounting surface.
    I also took the top three leafs out............cut them in half and placed them under the spring
    so I could use the stock U bolts and hardware. (If you didn't do this the spring would be recessed into the crossmember for the U bolts and hardware to keep the spring seated.)

    The T spring is 2" wide and the A spring 2-1/4" wide. You certainly don't want the spring moving around inside the crossmember.

    Here are two pictures, one showing the Coupe unloaded (in black primer) and one with a loaded chassis (bare metal with a yellow strip on the door), I don't have to worry about notching the frame because my crossmember is 3" further up than stock.

    Let me know how I can help.
     

    Attached Files:

  8. Flipper
    Joined: May 10, 2003
    Posts: 3,190

    Flipper
    Member
    from Kentucky

    Anybody know how wide for the T spring?
     
  9. lik2writ
    Joined: Feb 12, 2004
    Posts: 434

    lik2writ
    Member
    from NY

    You can set your perch hangers c/c for 20 -27 T at 48". All Model A's are like Chopped said. Aside from width, you may have suspension issues if you went with a T spring. Ask Pyschobillyboi, he ran a T spring on his roadster.
    Posies makes a narrow perch version of their Model A spring. Call and check for the setup measurements; at the very least you'll have a ballpark figure to work from.
     

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