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Thread: Mazdaspeed Miata Differential swap into 1999 Miata

  1. #1
    Oil Changer
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    Dec 2011
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    Garland. Texas
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    Default Mazdaspeed Miata Differential swap into 1999 Miata

    I am wanting to put a LS/Torsen differential in my 1999.

    I am told that the Mazdaspeed one will work, however, you also require the axles since they are different from the base Miata?

    What else will I require to make the conversion?

  2. #2

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    If I am correct the driveshaft also, I may be thinking of the 1.6 to 1.8 swap though

  3. #3

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    I also believe the MS dif has a different gear ratio than a 5spd dif so make sure you know what you are getting into.
    "Pain is inevitable, suffering is optional." Haruki Murakami

  4. #4
    Supporter EricJ's Avatar
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    Default

    In my '99, I put a Tochigi Fuji LSD from an '03. Direct swap for the open diff. No changes to axles or drive shaft. I got new oil seals and clips on the axle shafts, < $20. The gearing was the same 4.3.
    '99 Emerald Green

  5. #5
    Driver BigDmiata's Avatar
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    MSM has different axles, not sure, but think standard driveshaft. Not sure what final gear you want, but the MSM has 4.1.
    2013 Mazda2 slushbox daily
    1993 Miata (future exocet donor)

  6. #6
    Supporter EricJ's Avatar
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    I forgot, I also replaced the diff bushings. I used the Mazda Comp ones. I don't remember the cost.
    '99 Emerald Green

  7. #7

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    Quote Originally Posted by BigDmiata View Post
    MSM has different axles, not sure, but think standard driveshaft. Not sure what final gear you want, but the MSM has 4.1.
    You're right on all points.
    TXMC: Drinkin, shootin, racin!

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