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Technical Replacing subrails on 31 model a coupe where to start?

Discussion in 'Traditional Hot Rods' started by HHFester, Mar 13, 2014.

  1. HHFester
    Joined: Nov 8, 2011
    Posts: 17

    HHFester
    Member

    ImageUploadedByH.A.M.B.1394769338.354823.jpg ImageUploadedByH.A.M.B.1394769348.614223.jpg mine are pretty far gone how would I go about getting started to replace them? One side at a time?


    Fester.
     
  2. walter
    Joined: Nov 4, 2007
    Posts: 635

    walter
    Member

    I did my roadster one at a time but if I had to do it again I would start with a bear frame and mount the new subrails and reasemble in sections repairing problems as you assemble.
     
  3. Bam.inc
    Joined: Jun 25, 2012
    Posts: 660

    Bam.inc
    Member
    from KS

    If you put in on 32 rails, steadfast makes a nice rear subrail kit. Im sure many others make a model a kit.
    Get out wizz wheel, grinder, fire wrench, & cut the dead parts out. Take some pictures if you want to work back to original.
    Helps to have another friend, or your other car to occasionally go back to view.
    I'd let body float over rails with jack, lift, or crib 2x4's to your desired stance, then tack in new subrails.
    I say tack in...because I learned the hard way, after you get tires, engine, two people, 16gallons of gas & cooler, you may start moving things around in mockup before final welds.
     

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  4. Bam.inc
    Joined: Jun 25, 2012
    Posts: 660

    Bam.inc
    Member
    from KS

    Measure twice. Cut.cut. cut. Cut. Measure. Cut. Buy more cutoff wheels. Drink beer take picture. Measure. Cut.cut.cut. weld. Buy 2 more 4"grinders.
     

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  5. HHFester
    Joined: Nov 8, 2011
    Posts: 17

    HHFester
    Member

    Mine are gone front too back


    Fester.
     
  6. HHFester
    Joined: Nov 8, 2011
    Posts: 17

    HHFester
    Member

    ImageUploadedByH.A.M.B.1394773381.743972.jpg ImageUploadedByH.A.M.B.1394773396.788749.jpg


    Fester.
     
  7. The37Kid
    Joined: Apr 30, 2004
    Posts: 30,743

    The37Kid
    Member

    I made a table top with two pieces of MDF and placed my '30 Roadster subrails on it. I'm using originals from three different bodies. The cowl had rails that were cut at the back of the doors. Another set went from a cowl to the wheel well, and I've got a thirs section that went from the well to the back. Goal is to have a dead stock body, with everything fit properly, then buy the Steadfast kickup for mounting the body on a '32 frame. Bob [​IMG]
     
  8. jw johnston
    Joined: Oct 16, 2011
    Posts: 106

    jw johnston
    Member

    ImageUploadedByH.A.M.B.1394776668.889084.jpg
    Build the subrails first and separate. I like to use rivets just like the originals on the cars I do. Take lots of measurements from your original and build it from the cowl back. I love model A's because almost every piece is riveted and easily removable. Repair every piece separate then install on the new subrails.


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    bali-rod likes this.
  9. jw johnston
    Joined: Oct 16, 2011
    Posts: 106

    jw johnston
    Member

    ImageUploadedByH.A.M.B.1394777165.276372.jpg


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  10. white64
    Joined: Sep 15, 2008
    Posts: 679

    white64
    Member
    from Maine

    I did it this way too assembled the entire subframe on the frame itself then placed the body on the sub frame.

    The bottom 6 inches of the enitre body was gone except for the firewall, started there and worked back using the measurements other model A coupe guys had given me here and on the Ford Barn..

    BUT! I welded everything together since this car was never going to be confused with a riveted stocker.
     
    Last edited: Mar 15, 2014
  11. charlieb66
    Joined: Apr 18, 2011
    Posts: 549

    charlieb66
    Member

    You can buy the complete subframe assembly, put it on a table and start working on the body. Cost is likely to be the same if you build it yourself but the time and trouble saved will be enormous.
     
  12. Do you have a recommendation for a quality place to find the rails?
     
  13. scrap metal 48
    Joined: Sep 6, 2009
    Posts: 6,079

    scrap metal 48
    Member

    Brookville roadster has complete assembled subframes but they are expensive and hard to ship.. I like Walter's suggestion in post #2...
     
  14. I think that will be what I need to do. I think I will try to find another one so I can steal a few pieces from it.
     
  15. -yes. just like this
     
  16. 31ster
    Joined: Dec 26, 2007
    Posts: 215

    31ster
    Member

    On the roadster I had a drew a set if grid lines in a 4x8 sheet of ply wood and then centered my body on it. I only replaced the rear halves on mine. I also cut them at 90 degrees to the rails so they matched up well. It actually was really easy
     
    TheSteamDoc likes this.

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