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Hot Rods Spring behind front end with non dropped axles....Examples?

Discussion in 'The Hokey Ass Message Board' started by Jethro, Jan 12, 2020.

  1. Jethro
    Joined: Mar 5, 2001
    Posts: 1,952

    Jethro
    ALLIANCE MEMBER

    So, Im doing a spring behind front end on the coupe and was wondering what an undropped axle looks like and which stock axle would be the lowest. By my math (grade 12 equivalent....I did sixth grade twice) an undropped axle will drop approximately the same as a spring over with a dropped axle.....am I right? Just looking for picture examples for inspiration.
     
    29EHV8 likes this.
  2. mr.chevrolet
    Joined: Jul 19, 2006
    Posts: 9,204

    mr.chevrolet
    Member

    here's mine ( thanks to Chuck Emory) 20190723_120910.jpg 30A3 (1024x768).jpg 30A4.JPG
     
  3. Jethro
    Joined: Mar 5, 2001
    Posts: 1,952

    Jethro
    ALLIANCE MEMBER

    Is that a 32 axle? How does it sit at ride height?
     
  4. dumprat
    Joined: Dec 27, 2006
    Posts: 3,568

    dumprat
    Member
    from b.c.

    That is not a 32 axle. More like 46.

    If you remember Jeff I did spring behind on my T roadster. I had a 36 axle with A wishbones and welded/bolted blocks into the bones. It sat pretty low on 6.00-16's
     
  5. Jethro
    Joined: Mar 5, 2001
    Posts: 1,952

    Jethro
    ALLIANCE MEMBER

    Thanks Matt
    I know I've seen other spring behind with undropped axles , your T was probably one. I'm not looking to have this thing scraping it's belly but still want it pretty low....it's gotta sit right.

    How's the truck coming?
     
  6. 704409EF-605D-4160-957A-742E9FA51194.jpeg

    It’s always going to be a suicide axle but to Pull it off without scrub issues you need to have the right spring .
     
  7. Jethro
    Joined: Mar 5, 2001
    Posts: 1,952

    Jethro
    ALLIANCE MEMBER

    Yeah! I like that one...thats what I'm after.
     
  8. Desmodromic
    Joined: Sep 25, 2010
    Posts: 570

    Desmodromic
    Member

    Not sure what it is you want to be "lower". If you have a transverse spring above the axle, but below the frame rails, you must have a dropped axle to get the frame lower, but need to have ample clearance between the spring and frame rails, and between the center of axle and spring- to- crossmember attachment hardware. The limit would be when the axle has so much drop it is scraping on the road; as a practical matter, 4 or 5" drop is about the max. Given the axle to be used. You can lower the chassis by C-notching the frame rails above the springs, or Z-ing the rails, or using an elevated suicide spring mount. In my opinion, these are usually inelegant solutions.

    If the spring is behind the axle, the only limit to lowering the front end is the clearance between the axle and frame rails. If the rail forward extensions are cut off, it doesn't matter if it's a straight axle with zero drop; it does not dictate the limit to chassis lowering. As an absurd example, you could just make the spring shackles 12" long! (Yes, that creates other minor problems that need resolutions.)

    The simple answer to your question is that reversing the spring eyes will lower the car about 1-1/2", providing you have an equivalent excess clearance between the axle and the frame rails. If not, you can install a 1-1/2" dropped axle. If you want to go lower, more axle drop is required.

    In any event, while in the design stage, one needs to resolve tie-rod location, to ensure it has the required clearances to move with the axle, at any steering wheel position.
     
  9. For some good clear and current pictures Check out the cars built by the “rolling bones hot rod shop” . Their signature frame is low ride height on a stock axle set up with spring behind.
     

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