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Thread: Differentials for my m30b34 turbo conversion

  1. #1
    Join Date
    Dec 2013
    Location
    Nova Scotia
    Posts
    54
    My Cars
    1986 e24

    Differentials for my m30b34 turbo conversion

    Hello All:

    I am seeking some important info.

    wbaec7402g0607668 is my 1986 635 csi, and I am not sure what diff ratio it would have, so if you can help me out this would be appreciative.

    From this vin number: wbafh8403h1735067 is my 1987 735 csi diff, the question is this a 3.46 lsd?

    Lastly, I have a 1979 633 csi and I would like to know what diff is in it as well?

    Thank you;

    Brian

  2. #2
    Join Date
    Sep 2009
    Location
    Denver, Colorado
    Posts
    2,876
    My Cars
    1985 535i, 1980 635CSi
    It likely is the 3.46lsd that came with the car, which you can identify by turning it by hand. IMO a great ratio for a performance based ratio that gives usable 1st gear.

    Your 79 would be sideloader type (3.07 maybe) and would not interchange...

  3. #3
    Join Date
    Sep 2007
    Location
    North Alabama
    Posts
    897
    My Cars
    .
    Quote Originally Posted by mintus View Post
    Hello All:

    I am seeking some important info.

    wbaec7402g0607668 is my 1986 635 csi, and I am not sure what diff ratio it would have, so if you can help me out this would be appreciative.

    From this vin number: wbafh8403h1735067 is my 1987 735 csi diff, the question is this a 3.46 lsd?

    Lastly, I have a 1979 633 csi and I would like to know what diff is in it as well?

    Thank you;

    Brian
    Your 86 is a 3.46 LSD
    Your 87 is a 3.46 LSD
    Your 79 is a 3.45 (you will have to look if it is LSD or not)

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