Shifter / Knob Thread Adapters

Discussion in 'Transmission & Driveline Topics' started by redriderjf87, Dec 23, 2016.

  1. redriderjf87

    redriderjf87 Veteran Member

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    So, in ordering a new Hurst knob with button to wire in my linelock, I messed up on the thread sizes, my handle is 3/8" - 24 and the knob is 7/16" - 20 pitch. After realizing this, I thought I could get a thread adapter to save myself, but can't seem to find anything in general for thread adapters like this, other than maybe what comes with some other Hurst shifters (link below).

    All the other thread adapters I've looked up run into a 16mm x 1.5 thread, I'm assuming that would be if my knob didn't have any insert in the first place?? I hope I'm missing something easy, or do I just need to return the knob and not mess up next time? :) Thanks

    What I bought:
    https://www.amazon.com/Hurst-163005...=1482528723&sr=8-3&keywords=hurst+knob+button

    Has the adapter I may need? :
    https://www.amazon.com/Hurst-153001...82528938&sr=8-2&keywords=hurst+shifter+button
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

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    The difference between 3/8 (6/16) and 7/16 is only 1/16 of an inch. If you divide that between the two sides, the thread adapter would have to be only 1/32" thick. I don't know if they can build one so thin without it breaking.
     
  3. redriderjf87

    redriderjf87 Veteran Member

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    Gotcha, yeah I wasn't sure if there was anything that you could even do in 2 pieces, so it could be thicker and then accept a 7/16 stud or something. I'm going to assume thats not the case though. Thanks for the help
     
  4. COPO

    COPO Veteran Member Lifetime Gold Member

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    I'd return it and get the correct one.
     
  5. black_aerocoupe

    black_aerocoupe Veteran Member

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    M16 is one of the larger production threads from the 83-02 F-bodies. It is used so M16 knobs can be adapted to most anything smaller.

    The minor diameter of 7/16"-20 thread is smaller than the major diameter of 3/8"-24. So you would have an interesting series of crescent shapes were you to attempt to machine it.
     

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