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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: 828

    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: 6,282

    krylon32
    Alliance Vendor
    from Nebraska

    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: 15,520

    alchemy
    ALLIANCE 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: 711

    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.
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  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: 828

    cody1958
    Member
    from wichita ks

    IMG_20200208_174519.jpg think it's gonna be perfect.
     
  7. cody1958
    Joined: Sep 19, 2006
    Posts: 828

    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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