MX5 NA Open Diff to Torsen - What do I need?

Thread in 'Technical Questions' started by LaRoche, Jun 2, 2018.

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  1. LaRoche

    LaRoche New Member

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    Hi All,

    I'm looking to swap the Open diff on my scabby 1.8 MX5 Na. I just have 2 questions:

    1) Does anyone know the ratio of the stock 1.8 Diff? (1997 UK Spec)
    2) Will I need any shafts too, or will the new Torsen fit with the current shafts?

    Any help is appreciated

    Thank you

    LaRoche
     
  2. Ramon

    Ramon Member

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    I fit a 4.30:1 torsen to my european 1996 1.8

    All I needed was the diff itself. The drive shaft and rear axles were a direct fit for the torsen.

    The open diff I took out was (I believe) 4.10:1. I could go ahead and count the gears because I still have the open diff on the shelf.

    Useless information: For the 1.8 there are 2 types of rear axles. You have the bolted type (easy to remove and install the diff) and the other type is just straight axle from the hub to the diff, no bolts. Both axles types can be used with either open or torsen diff.
     
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  3. LaRoche

    LaRoche New Member

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    Thanks Ramon, that's all very useful info!
     
  4. prblmslvrs

    prblmslvrs Active Member

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    yeah its a direct fit going 1.8 to 1.8.

    Doesn't matter if the diff has push in shafts or bolt in shafts because the bolt in stubs are removable to put in the push in shafts, or you can put in the stubs into a push in diff.
     
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  5. LaRoche

    LaRoche New Member

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    Thanks for your replies - very helpful!

    I picked up a Torsen today with the stub shafts just in case

    Will hopefully swap it over next weekend
     
  6. Ramon

    Ramon Member

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  7. LaRoche

    LaRoche New Member

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    Thanks Ramon,

    Probably will end up needing some help based on my previous DIY experiences :smash:

    And thanks for the link - It will be a drifter so I probably should get some bushes whilst its off
     
  8. LaRoche

    LaRoche New Member

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    I've ordered some diff bushes today, just wondering what's the best way to remove the old ones?
     
  9. Ramon

    Ramon Member

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    That's what I did :p If you don't have a proper press I suggest you try this :p I borrowed the electric hammer. Just go easy and you'll be fine. Make sure it has a dull chisel. Let it hook on the metal edge of the bushing. Do a star pattern thing and eventually it will come.

    Don't even try to start doing this without at least a hammer thing like that.. Just a tip :)

    Anyway good shit, keep me updated!
     

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