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Old 10-30-2012, 02:41 PM   #1
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Default 3.9 open diff?

I tried searching but couldn't find much info. Did they ever make a 3.9 ratio non torsen diff for miatas?


Look at this on eBay:

1999 Mazda Miata Open Differential 3.9:1 Ratio Pulled Working Upgraded Save

http://bit.ly/Rr5NLE
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Old 10-30-2012, 02:45 PM   #2
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No, they never made open 3.9 diffs. Furthermore, in 1999 it was only offered on 10AE miatas. So it's either a Torsen or a 4.1/4.3 open diff.

In 2003 there were the Fuji diffs that look like open diffs but are actually a clutch pack-type. I have one.
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Old 10-30-2012, 02:48 PM   #3
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I am pretty sure they did. My memory tells me my spare diff is a 3.9 open.

Edit: Soviet beat me to it. Now I have to go look at my spare to see what it is.
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Old 10-30-2012, 02:59 PM   #4
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The pictures make it look like an open diff (no large bushing) so the question would be what is the actual ratio. I think 4.3 came in autos that year?
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Old 10-31-2012, 11:36 AM   #5
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Looks like a diff from an auto car, so assuming that no one has changed out the R&P, it would be open, but not 3.909:1.
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