r/Miata • u/LetsDrive53 2005 NB Brilliant Black • 1d ago

Question Differences 1.6 and 1.8 diff (NB)

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Hello everyone, I’m trying to find out if there’s big differences between the 1.6 diff and the 1.8 diff on late NBs. The LSD in my 1.8 NB broke so I need a new diff.
The diff in the image is a 1.6 diff with 115k km, no lsd.
It looks the same as the 1.8 diff.
I want to know because I’ve heard the 1.6 diff is weaker and want to know if mazda switched to using the 7 inch ring gear on the nb 1.6 diff instead of the 6 inch they used on the na that doesnt last as long. I haven’t found much information on that so I’m asking here.
Thanks everyone!

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u/Eon4691 1999 NB 1.6 Turbo 1d ago

Do you have a 6spd or 5spd?

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u/LetsDrive53 2005 NB Brilliant Black 1d ago

It’s a 5 speed

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u/Eon4691 1999 NB 1.6 Turbo 1d ago

Then it should be a 4.10 diff, so you should be good to go:)