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Thread: Screw the shift knob?

  1. #1
    Defender of the Normal John Fusco's Avatar
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    Screw the shift knob?

    Can anyone tell me what part I am missing in order to attach an original shift knob onto the threads of the stick on a 67 ?
    The replacement knob that is on it now has a threaded insert that doesn't fit the original.

    thanks

  2. #2
    Your replacement knob should not be threaded...it should have a crush collar...
    Paul D. Early S Registry #8 - Cyclops Minister of West Coast Affairs
    "Now, to put a water-cooled engine in the rear and to have the radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. 1973)

  3. #3
    Defender of the Normal John Fusco's Avatar
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    Thank you pwds 72s

  4. #4
    Goldmember ttweed's Avatar
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    Originally posted by pwd72s
    Your replacement knob should not be threaded...it should have a crush collar...
    Paul-

    This is not true for the very early cars ('65-'67). The shift lever is threaded at the top on my '67S and cannot accept the crush collar type of press-fit knob the later cars use. Not sure when the change was made to the press-fit, maybe '68-'69?

    I do not understand John's original question, however. What is it that doesn't fit? Your statement, "The replacement knob that is on it now has a threaded insert that doesn't fit the original" isn't clear to me. The original plastic knob on a '67 has a threaded insert inside which screws onto the threads on the original shift lever. Has your knob been replaced in the past and now you are going back to an original one or what? A little more detail on the problem would help me understand better.

    TT
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  5. #5
    Defender of the Normal John Fusco's Avatar
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    Tom;

    The knob that is on now (wood, aftermarket) has a threaded metal piece that fits tightly into the knob. That same threaded piece does not sit tight into the period correct 5 speed 67 plastic knob that I found to replace it.
    I'm not sure if I made it any clearer - I will try to send a pic when I get one.

    Thanks All

  6. #6
    If TT is correct and early cars had threaded lever and knob, you may have later knob for use on an unthreaded lever with a crush washer.

  7. #7
    Learn something every day. I think John may have one of the $2.95 (that's about what they sold for back then) aftermarket knobs that fastened with a horizontal set screw. They threaded the early knobs? Didn't try to remove the knob from my '66 912. so didn't know that. Which leads me to wonder...would it be possible to use a metric tap & die set to place threads in a later model replacement knob? Perhaps fill the newer knob with a resin plastic, then make a new threaded hole? Any machinists here?
    Paul D. Early S Registry #8 - Cyclops Minister of West Coast Affairs
    "Now, to put a water-cooled engine in the rear and to have the radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. 1973)

  8. #8
    Defender of the Normal John Fusco's Avatar
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    I had no idea something like changing the shift knob could be so complicated - and so interesting.
    It seems I have an awful lot to learn.

    What should the inside of the 67 factory knob look like - is it different than the 68 - 73 ? Are the ends of the sticks on all the early cars threaded?
    The inside of the knob I am trying to put on is smooth like the outside.
    I'm going to have to get me a digital camera.

  9. #9
    I suspect your smooth on the inside knob is like mine...a 1972. I've never pulled my knob, but my understanding is that it's held in place by a crush sleeve...removal technique is to place a open end wrench head below the knob, strike upwards with a hammmer. To replace, a new crush sleeve is required, and they are still available. But...threaded shift lever? I have no idea what model years had this...
    Paul D. Early S Registry #8 - Cyclops Minister of West Coast Affairs
    "Now, to put a water-cooled engine in the rear and to have the radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. 1973)

  10. #10
    Goldmember ttweed's Avatar
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    Originally posted by John Fusco
    The inside of the knob I am trying to put on is smooth like the outside.
    If the inside of the knob is smooth all the way down, then it is made for the crush washer style lever. I would get one of the threaded type replacement knobs instead. They are only $20 or so, according to the AJ-USA catalog.

    The only way to mount the one you have successfully on a threaded lever is with a suitable epoxy to bond it to the lever or machine the lever to accept the crush washer. This would only be a last resort, in my opinion. Better to get the correct knob.

    Here is a pic from the factory parts book showing both styles of shift levers. The crush washer style is shown on the left as part #901.421.011.03, while the screw type is 901.424.011.02.

    TT
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    Tom Tweed
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