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Thread: Let’s Talk About Differentials

  1. #1
    Join Date
    Jun 2009
    Location
    Owensboro, KY
    Posts
    32
    My Cars
    2007 Z4M-R, 1992 735i

    Let’s Talk About Differentials

    So I have a various selection of diffs sitting around and I’m trying to figure out what will work and what will not. Maybe someone more enlightened can help me out. Here’s what I have:
    1992 735i, 4.27 LSD
    1988 535i, 3.25 LSD
    1987 325iS, 3.73 LSD
    I’d like to put the E30 diff into the E28 to make it a bit more spirited (it’s staying stock otherwise) and put the E28 diff into the E32. The E30 is purely a parts car, so I’m not worried about putting anything back in it. Are these diffs relatively interchangeable? From what I gather they’re all 188mm medium case.
    '88 535i
    '95 525i
    '92 735i
    '87 325iS

  2. #2
    Join Date
    Mar 2013
    Location
    USA
    Posts
    465
    My Cars
    E21/early e23/e34
    e30/e28 interchange but you'll have to swap axel flanges and rear cover on the e30 to use on the e28- both will not interchange with the E32, the E32 has a different housing.

  3. #3
    Join Date
    Sep 2009
    Location
    Denver, Colorado
    Posts
    2,876
    My Cars
    1985 535i, 1980 635CSi

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