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Technical Rear spring perch model a

Discussion in 'The Hokey Ass Message Board' started by cody1958, Jan 29, 2020.

  1. cody1958
    Joined: Sep 19, 2006
    Posts: 833

    cody1958
    Member
    from wichita ks

    I'm putting a bronco rear end in model a chassis. The factory spring was to wide for my rearend it was in the way of backing plates. I ordered a brand new main leaf that is 2 inches narrower on each side. So a total . In theory do I just move the spring perches in two Inches also or do u think that new spring being shorter and stronger it may vary. I took the main spring apart and it's right at 4 inch total compared to old spring. Or is there another way to make sure the perches are where I need em.
     
  2. krylon32
    Joined: Jan 29, 2006
    Posts: 9,397

    krylon32
    ALLIANCE MEMBER
    from Nebraska
    1. Central Nebraska H.A.M.B.

    The manufacturer of your main leaf should be able to tell you what the perch center should be?
     
    sidevalve8ba likes this.
  3. alchemy
    Joined: Sep 27, 2002
    Posts: 20,407

    alchemy
    Member

    Placing the spring perches at the right width is always a crapshoot. If your car weighs a little different than the "design" car the spring width will be different at rest. Use the manufacturer's recommendations, but if the car is much lighter or heavier than a stock A, I might adjust a little inward or outward (with your 4" also).
     
  4. DOCTOR SATAN
    Joined: Mar 21, 2014
    Posts: 710

    DOCTOR SATAN
    Member
    from okc

    Anyone know the stock dimension, I have asked with replies anywhere from 46.5 to 49.5
     
    warbird1 likes this.

  5. Mine are at 49.5 which is stock. Yours should be at 45.5 given that your spring is 4" narrower. IMG_1428.JPG
     
  6. cody1958
    Joined: Sep 19, 2006
    Posts: 833

    cody1958
    Member
    from wichita ks

    IMG_20200208_174519.jpg think it's gonna be perfect.
     
  7. cody1958
    Joined: Sep 19, 2006
    Posts: 833

    cody1958
    Member
    from wichita ks

    Building a 29 roadster. Here is chassis. 10 inch kickup in rear 4 in front
     

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    winduptoy likes this.

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