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Old 03-18-2011, 12:05 AM   #1
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Default NB diff into NA - machining?

Is there any machining required for the subframe or chassis?

I have everything set for the swap, just curious..?

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Old 03-18-2011, 12:38 AM   #2
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NB diff and '94-'97 NA diff = 1.8 rear end.

From '94 to '05 they are pretty much all the same, with a few variants in axles(two piece and one piece).

However, it is all compatible with a NA 1.6 Miata. You'll need the differential, housing, drive shaft and axles/half shafts from a 1.8 car.
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Old 03-18-2011, 12:41 AM   #3
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I think I answered my own question.... Only the very early NA's had the smaller ring gear.
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Old 03-18-2011, 12:43 AM   #4
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The housings/R&P are all the same from 94-05. The only differences are the guts and axles....which are all interchangable without modification. Just swap the whole rearend in and go...no need to take it apart unless you're starting with a carrier that has an open diff.
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Old 03-18-2011, 06:56 AM   #5
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How about gear ratio ?
I own one of the first Miata's ('89). It is in good shape but the differential is noisy.
Also I plan to do a turbo upgrade next winter and I wan't to change the diffmounts so I'd better be ready and do it right in just one transplantation. If you keep the stock 5 speed, does changing the differential change anything at all ?
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Old 03-18-2011, 08:27 AM   #6
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First, you'll want a 1.8L rearend. There are a few gear options that are easily found with a quick SEARCH around here or Miata.net. I'll let you find the details, but you've got 4.3, 4.1 and 3.9 all available with LSD.
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Old 03-18-2011, 09:11 AM   #7
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I read that the only difference is the axles from a Torsen to an open? true?
ABS axles different from non-abs? - I would imagine so with the ABS rings...

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Old 03-18-2011, 09:28 AM   #8
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Same axles with ABS ring gears is all.

you just need a rear from a 94-05, axles, and the driveshaft. very simple.
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Old 03-18-2011, 09:34 AM   #9
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Sounds like I'm all set.....until I get the OS Giken that is..
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