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Technical flat top aftermarket perch bolt lengths into a 35/36 wishbone over a 37-40 bone

Discussion in 'The Hokey Ass Message Board' started by nobby, Apr 22, 2024.

  1. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    perch bolt 1.jpg perch bolt 2.jpg
    perch bolt 3.jpg
    question, is there a difference in a 1937-40 ford wishbone and a 35/36 wishbone
    from where the tapers start

    or IF I purchase pin 1 or 2 will the castellated nut bottom out on the smooth shank as there is less meat on a 36 bone?

    so I have to use perch bolt 3 as the tapered washer will ride up the shaft even IF the bone is 1/4 inch narrow - if in deed it is?
     
  2. AVater
    Joined: Dec 9, 2008
    Posts: 3,382

    AVater
    ALLIANCE MEMBER
    1. Connecticut HAMB'ers

    I may be missing something here but for starters, didn’t you post a video showing the difference between a 35/36 and 37-40 axle the other day? If so, I think you showed there is a difference between the spread of the perch holes. If I remember correctly that there is, the perch bolt question is moot because you will not be able to use the 35/36 axle with the 37-40 wishbone or vice versa. You could split the wishbone but would then need to heat and bend the spring perches to compensate for the wishbone angle difference. Then there would be the axle height difference……

    Maybe I misunderstand and you are looking to match proper year axle and wishbone. If so I’m thinking the question is: Are the bolts made for a 2 1/4 inch axle going to have too few threads with a 2 inch axle set up?

    I have to think someone has a spacer for this application.

    I can’t tell the difference in the lengths of the bolts from the picture. The castellated set would be my preference as it has the taper needed to seat into the wishbone bottom built in.
     
  3. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    hello
    I picked up my 36.5 perch 2'' boss axle yesterday
    I have had to saw off my perch pins to save the bone

    I cannot measure the bone until asturday
    I want to order some pins today so they arrive for saturday.

    yes you are correct - will the aftermarket pins work with a 2'' wishbone
    specifically a 36

    I cant measure it as the bits are elsewhere and I would like to order some today so they are here for the weekend...

    I have however just realised I have a 37 axle and wishbone of which I could sacrifice the axle for the pins
    however, I still don't know if the 37-40 pins will be too long for the 36 bone.
     
  4. kb cookout
    Joined: Dec 17, 2004
    Posts: 5,648

    kb cookout
    Member

    Attached Files:

  5. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member

    Hello,
    Thank you very much for taking the time to both take the pictures and upload the photographs
    many Thanks
     
  6. Roothawg
    Joined: Mar 14, 2001
    Posts: 25,795

    Roothawg
    Member

    I use the longer pins on 35-36 Axles when I swap them out for spring over axle. This makes them long enough for headlight perches as well.
     
  7. nobby
    Joined: Jan 8, 2006
    Posts: 1,358

    nobby
    Member



    there be the info
    thanks
    couldn't even undo the nuts on those pins!!!
     

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