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Old 12-16-2012, 06:33 PM   #1
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Default 3.90 10th anniversary VS Mazdaspeed

Are there any differences between these differentials?
I have a 3.90:1 and don't know if it came from a 10th anniversary or a Mazdaspeed, now I need half-shafts so I need to know which shafts to buy.

The 3.90 that I have has numbers cast on the left side "MA02 4 PA" and painted at the bottom in white "3818" and a couple of dash marks hand painted in white on the top that look like number eleven. It has 26 splines inside the diff.
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Old 12-16-2012, 07:17 PM   #2
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Mazdaspeeds didnt come with 3.9's.
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Old 12-16-2012, 09:42 PM   #3
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Thank's for the info, I always assumed the Mazdaspeed had a 3.90 because of the 6 speed transmission. Found one on Ebay Mazda Miata mazdaspeed Differential MX5 4 10 1 Ratio | eBay that confirms they are 4.10:1
Due the 3.90 diffs form the 10th anniversary use the same one piece half-shafts than the rest of the normally aspirated post 99 miatas?
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Old 12-16-2012, 09:58 PM   #4
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Yeah. Do more research.
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Old 12-16-2012, 10:01 PM   #5
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yeah
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Old 12-17-2012, 10:38 PM   #6
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Only Mazdaspeed diffs and axles are different. End discussion.
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Old 12-18-2012, 10:04 PM   #7
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Ok, will get regular one piece shafts from any NB1 NB2 exept Mazdaspeed.
Thank you.
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Old 12-19-2012, 12:30 AM   #8
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99-03 6spd cars had 3.9 diffs. for sure. Pretty sure all 04-05 6spd cars had 4.1 like MSM (but MSM had larger axles)
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Old 12-19-2012, 08:38 PM   #9
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None of that matters because all he was trying to figure out was what axles to get.
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