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Identifying a LSD diff ratio (and other Qs)

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    Identifying a LSD diff ratio (and other Qs)

    Hi there, I'm just trying to work out if this is a 4.11 LSD small case.

    Is there anything I should be looking for other than leaky seals - and what oil is used in these?

    Thanks

    The tag reads 1041A4960S





    '90 BMW E30 318is
    '99 Honda DC2R

    #2
    Tag relates to the original and the actual ratio could be changed. However I understand the '1041' of 1041A4960S refers to 10 and 41 teeth and 41/10 = 4.1.

    Tooth count will confirm
    sigpic

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      #3
      Thanks - will llok it over and get counting :)
      '90 BMW E30 318is
      '99 Honda DC2R

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        #4
        Many methods:


        The counting teeth option is the most accurate imo.

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          #5
          search for images of the inside of a 4.10 LSD. there is an obvious configuration difference between open and LSD. Way more open space to look at spider gears on an open diff.
          Having an "S" on the tag is a probable indicator of LSD in the US.
          Last edited by ahlem; 07-15-2016, 10:20 AM. Reason: forgot something the first time

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