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What leaf spring length?

Discussion in 'The Hokey Ass Message Board' started by oldskooloutlaw, Mar 25, 2010.

  1. oldskooloutlaw
    Joined: Dec 3, 2008
    Posts: 223

    from Tulsa

    I have a 41 Ford coupe that I want to put parallel springs on both ends of the car but I have no idea what is the typical length for the springs? I have a straight tube front axle and a 9" out back.
  2. krooser
    Joined: Jul 25, 2004
    Posts: 4,584


    The longer the spring the better the ride. By 1935 Ford had figured that out hence the wider/longer springs starting that year. By '41 they were even longer.

    I sure wouldn't swap out the buggy front spring on your '41... the frame is pretty narrow for that... keep the buggy spring as they can ride and handle pretty well.

    Out back you want the longest spring you can get. it should be shorter from the front spring eye to the center bolt than from the rear eye to the center bolt... that will stiffen it for less spring wrap on acceleration. You'll also have to design in some "anti-dive" if you want the rear to get forward bite... something the original Ford has right from the factory.

    All in all Henry had a good suspension in his pre-'48 rides... most aftermarket rear parralel kits don't have a good spring in them... too short and no anti-dive.
  3. Jalopy Joker
    Joined: Sep 3, 2006
    Posts: 28,545

    Jalopy Joker

    have you done a search for springs at places like Eaton, Bob Drake, Sacramento Vintage Ford, etc?
  4. pasadenahotrod
    Joined: Feb 13, 2007
    Posts: 11,776

    from Texas

    How about Posey's in Hummelstown PA?

  5. alot of the aftermarket kits use springs that are the same as dodge 4x4 front springs. Several i hafve seen use Toyota 2wd truck rear springs in addition
  6. krylon32
    Joined: Jan 29, 2006
    Posts: 7,910

    Alliance Vendor
    from Nebraska

    I used to build a fat fendred spring kit using the Dodge 6 cylinder front springs from the I think mid 70s. It's the same style spring CE uses now.
  7. 53sled
    Joined: Jul 5, 2005
    Posts: 5,818

    from KCMO

    I would use as long a spring as I could without extending the frame out the front too far.
  8. Glideman88
    Joined: Jul 8, 2008
    Posts: 39


    I'm in the planning stages (still trying to score affordable "free" parts) for installing parallel springs + 9'' axle in the back of my '41 Business Coupe. So this is an awesome thread for me too!

    My question is...Why would you want a parallel set-up on the front?
    Last edited: Mar 25, 2010
  9. oldskooloutlaw
    Joined: Dec 3, 2008
    Posts: 223

    from Tulsa

    Well I had intended to run a straight tube axle and I still might. I have had some opinions that that isn't easy driving or safe, But thats what the gassers ran back when.
  10. lowkroozer
    Joined: Jun 1, 2006
    Posts: 601


    chassis has complete bolt on kits .Get on there site and request a free catalog
  11. 48ford
    Joined: Dec 15, 2001
    Posts: 450


    You can try this,
    Grab the spring hangers off a chrysler 5th ave or dodge diplomat. 1983-86 or close.
    Check out the springs under a bronco ll. this should get you close.
    take a walk around a junk yard,and take measurment.(spl)
    Hope this helps

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