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Thread: 3.45 LSD Differential Identification (pulled from 1997 840ci)

  1. #1
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    3.45 LSD Differential Identification (pulled from 1997 840ci)

    Hello, I have a 3.45 LSD Differential we pulled from a 1997 840ci. From my research its from a 850csi, Is this correct? or a Alpina B12 5.0.
    Can anyone help clear this up?

  2. #2
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  3. #3
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    IMHO, that is actually a good gear set for an 840. I have a 3.23:1 LSD in my 97 850/5-speed auto and that is great gearing for the V12.

    3.45:1 is not from a stock CSi, the Alpine catalog list a 3:45 ring/pinion set.
    The African 850-M70/automatic had a 3:45:1 open diff.
    Also, the Euro E32, 735 had a 3.45:1 LSD diff.
    With that, Owners have been upgrading diffs since the first cars so I wouldn't doubt this is a 1-off upgrade since the 3:45:1 ring/pinion and LSD units use to be readily available beyond the complete diff assembly from BMW.
    Last edited by m6bigdog; 09-17-2018 at 06:56 PM.

  4. #4
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    Yes I believe it is a upgrade but my question is are the internals 3.45 LSD Factory or aftermarket? And if factory what are they out of?

  5. #5
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    Quote Originally Posted by Partsguy03 View Post
    Yes I believe it is a upgrade but my question is are the internals 3.45 LSD Factory or aftermarket? And if factory what are they out of?
    The complete 3.45:1 Diffs are NLA from BMW.
    Also, BMW does not sell Diff gears anymore.

    NLA Complete Diff Part numbers:
    European E32-3.45:1/LSD: 33 10 1 213 921
    African E31-3.45:1/Open: 33 10 1 213 895

    Try these guys,
    http://diffsonline.com/bmw-e31-840-8...l#.W6Ax8M5KiHs
    Last edited by m6bigdog; 09-18-2018 at 10:03 AM.

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