gohammer

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.

Chilicharger665

iTrader: (2)

Mazdaspeeds didnt come with 3.9's.

gohammer

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?

Braineack

iTrader: (62)

Yeah. Do more research.

18psi

iTrader: (76)

yeah

Chilicharger665

iTrader: (2)

Only Mazdaspeed diffs and axles are different. End discussion.

gohammer

Ok, will get regular one piece shafts from any NB1 NB2 exept Mazdaspeed.
Thank you.

Doppelgänger

iTrader: (12)

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)

Chilicharger665

iTrader: (2)

None of that matters because all he was trying to figure out was what axles to get.