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Technical 37 Chevy coupe gasser front axle??

Discussion in 'Traditional Hot Rods' started by jackalope, Dec 16, 2024.

  1. jackalope
    Joined: Mar 11, 2011
    Posts: 690

    jackalope
    Member

    Been a bit since I’ve been on here. I’m trying to help a friend out with his 37 Chevy coupe he’s making a gasser out of. My question seems to have multiple answers but I’m gonna ask again. For the front axle, when running the parallel leaf springs, what is the most common and ideal configuration with the shackle. By that, I mean running the shackle from the front or the rear or is this moot? I am not building gassers typically and I’m getting a lot of varied opinions. This isn’t a radical one. Just a few inches. It’ll have a custom drop axle made, etc.
    Thanks in advance.
     
  2. seb fontana
    Joined: Sep 1, 2005
    Posts: 8,920

    seb fontana
    Member
    from ct

    Shackle in front will be easier to handle the frame drop at the firewall area.
     
    jackalope likes this.
  3. wheelguy
    Joined: Feb 19, 2011
    Posts: 431

    wheelguy
    Member

    37 Chev factory axle cars had the shackle in the back (for what that's worth)
     
  4. 1971BB427
    Joined: Mar 6, 2010
    Posts: 9,297

    1971BB427
    Member
    from Oregon

    Shackle in front or back wont change much. Just be sure to keep shackle length down to no more than 3" or they tend to deflect as you turn the wheels, or take corners.
    I personally try to always put my shackles on the opposite side of the steering box is on. So if the steering is ahead of the axle I put shackles behind, and vice versa.
    I don't like my drag link pushing/pulling against the same side as shackles are.
     
  5. jackalope
    Joined: Mar 11, 2011
    Posts: 690

    jackalope
    Member

    That makes good sense. Albeit minimal deflection, it all adds up in steering. I really like this advice. As long as I’ve been messing with cars this didn’t even dawn on me. I’ll hold onto this one!
     
  6. I believe mine showed the axle traveled 3/4 - 7/8's on deflection, coming down from wheelie things could get hairy if the steering is on the wrong side of a push pull setup, cross steering it really doesn't matter which side the shackle is on.
     
  7. Mr48chev
    Joined: Dec 28, 2007
    Posts: 35,118

    Mr48chev
    ALLIANCE MEMBER

    A 37 master had leaf springs and an I beam while a 37 Master Deluxe had the independent front end.
     
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  8. 1971BB427
    Joined: Mar 6, 2010
    Posts: 9,297

    1971BB427
    Member
    from Oregon

    Yes, my '39 is a Master Deluxe Sport Coupe, so had independent front suspension. Even when it was previously raced and had either a hot GMC 301 six, or later a V8 swap. I tore it all out and went to an I beam axle.
     
  9. 1971BB427
    Joined: Mar 6, 2010
    Posts: 9,297

    1971BB427
    Member
    from Oregon

    I'm not referring to front/rear deflection. It's side deflection with cross steer where the drag link pushes/pulls against the same side as the shackles. It may not move much, but it can be felt as mushy steering where you lose some feel in the steering wheel and it's less precise if shackles share the same side as the drag link.
     
    jackalope likes this.
  10. IMG_1437.jpg My 36 Chevy Standard still has the stock straight axle (other than the lift blocks) and the shackles are at the rear. No clue how the handling will be just yet. It pushes in and out of the shop good....
     
    jackalope and Jibs like this.
  11. jackalope
    Joined: Mar 11, 2011
    Posts: 690

    jackalope
    Member

    I understood what you were saying and it makes perfect sense. I also knew the other poster was misunderstanding what you wrote.
     
    1971BB427 likes this.

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