BMW: List of 210mm cases that came with 3.91 or 4.10

Thread in 'Technical Questions' started by richATTK, Apr 30, 2013.

  1. richATTK

    richATTK New Member

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    edit: updated list.


    I'm looking to diff options for me E46 M3. I figure I could ask some guys across the pond, it seems slightly more common to drift these over there than here in the States.

    I've been looking around for diff options. I've found lots of old threads, I just want to ask if anyone has a DEFINITE/exact/updated list of what BM cars came with a large, 210 case (with 8 bolts on each side of case, not 6) with 3.91 or even 4.10 gears. I'd like to try to score a cheap diff and swap over the gears. If it's an open diff, weld it and see how I like it compared to my stock M-Variable Diff.

    This is what I've found, please confirm or correct me:

    Large 210mm Cases (any gearing)

    -E24 M6
    -E31 850 (auto has 3.64)
    -E34 M5 before 6/94= 3.91
    -E36 Euro (w/3.2l) M3)
    -E38 730, 740 (V8s), 750 (v12)
    -E39 535, 540, M5 (all V8)

    as I said before, I'm not 100% sure on these, it's just info I've gathered from the last couple days, any help is appreciated. Thanks guys!
     
    #1 richATTK, Apr 30, 2013
    Last edited: May 6, 2013
  2. richATTK

    richATTK New Member

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  3. jankes

    jankes Member

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    e34 M5 has 3.9 ratio mate but not sure if its from 3.6 or 3.8litre model
     
  4. alexfalk

    alexfalk Member

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    The only e34 diffs with 3,91 gear ratio are m5 up to 6/94 and 535i automatic with m30 post 9/89.
    540 is 2,93.
     
  5. richATTK

    richATTK New Member

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    Thanks and these are all the large 210mm cases right? Mostly everything I find is for the medium 188 case
     
  6. alexfalk

    alexfalk Member

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    Yes those are 210. From what i know only the 3,2 m3 have 210 from the e36 chassi.
     
  7. richATTK

    richATTK New Member

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    Yeah not many of them around here in the States. We got the 3.0 S50B30.
     
  8. Bolf

    Bolf Resident Nut Job.

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    e39 540i is 2.81 , both manual and auto
    e38 740i is 2.91 i think and the sports are 3.15
     
  9. richATTK

    richATTK New Member

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    Thanks, guys. I've updated the list. The search goes on.....
     
  10. superclarkey

    superclarkey DORITECH MOTORSPORT

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    Fairly sure 4.1 is a motorsport only diff, didn't think you could get a 210mm in 4.1 off the line.
     
  11. Bolf

    Bolf Resident Nut Job.

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    One of the x5's are 4.1 iirc
     
  12. DaveM

    DaveM flickwandoops

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  13. superclarkey

    superclarkey DORITECH MOTORSPORT

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    Yeah its a 4.1 but I didn't think it was a 210mm diff?
     
  14. richATTK

    richATTK New Member

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    Yeah a 3l sounds like it would be a medium, 188 case.
     
    #14 richATTK, May 9, 2013
    Last edited: May 9, 2013

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