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Thread: 240Z OEM shock inserts

  1. #1
    Registered User zed2's Avatar
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    Default 240Z OEM shock inserts

    I have been researching OEM shock inserts and have identified the following part numbers:
    56105 E4125 normal resistance shock front
    56105 E4185 firm resistance shock front
    56205 E4125 normal resistance shock rear
    56205 E4185 firm resistance shock rear

    Does anyone know what causes the shock to be either "normal" or "firm"? Is it the viscosity of the oil in the shock? Is the the internal valving of the shock?

    Also, which shock was installed during original manufacture of the 1970 model year?

    Thanks,
    Keith

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    Semi-retired admin Arne's Avatar
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    Quote Originally Posted by zed2 View Post
    Does anyone know what causes the shock to be either "normal" or "firm"? Is it the viscosity of the oil in the shock? Is the the internal valving of the shock?
    Probably the valving. But hard to say for certain at this point.

    Quote Originally Posted by zed2 View Post
    Also, which shock was installed during original manufacture of the 1970 model year?
    Neither. The inserts were for replacement only, not used in original production. The original struts were assembled inside the tube, not self-contained inserts.
    Arne - Former owner, HLS30-37705, 7/71, 905 Red
    Car blogs - 240Z - Porsche 911

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    I can answer your second question because I have a parts catalog handy, but will leave the first question to someone more knowledgable.

    These are the shock absorbers used up to 07/73.

    Front
    56110-E4125 - US & CAN
    56110-E4126 - HS30 2 seater

    Rear
    56210-E4125 - US & CAN
    56210-E4126 - HS30 2 seater

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    Datsaholic Mr Camouflage's Avatar
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    Quote Originally Posted by zed2 View Post
    Also, which shock was installed during original manufacture of the 1970 model year?

    Thanks,
    Keith
    US got the soft ones, rest of the world got the firm ones. That would be my guess.
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