8.5 posi question

Discussion in 'Got gears?' started by Note 1970, Apr 28, 2023.

  1. Note 1970

    Note 1970 Well-Known Member

    i just picked up a posi unit out of an 79 z/28. 410408n. Looks good and clean. Clutches and shims all look good. Only question is when I pulled it out there was no s spring in it. Any thoughts? Is this needed? If so would anyone have an extra. It’s going in a budget build car.
  2. BrianTrick

    BrianTrick Brian Trick

    The 410408 is a great factory unit. Yes,they originally had a spring,but if the unit is assembled and tuned correctly,it will not need the spring.
  3. monzaz

    monzaz Jim

    You can stick a EATON posi cage spring pack in there too IF you really feel you need one.
    New S springs are harder to find these days... PM me I can check and see if I have any left...BUT I doubt it.
    JD Race

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