6 Speed Automatic Transmission and Diff

barneywomble · Postby **barneywomble** » Wed Feb 01, 2012 2:34 am

Hi to all...

I recently became the new owner of a secondhand MX-5, 2009 NC with a retractable hardtop and the 6 speed Automatic Transmission with Paddle Shift. All of which works well but is very new to me. Could someone steer me in the direction (Brisbane) of a good (knowledgeable) auto man (or woman) who could modify transmission for a little heavy duty action. I would ideally like to modify the shift points and have the box shift a little harder. Does anyone know if the torque converter is of a lock up style or does it work with clutches etc...?

I have also been told that the 2009 NC with Auto Trans and retractable roof do not have the Limited Slip Diff..... is this true....? how can i tel what diff is in this particulae model....?

thanks in advance.... barneywomble...

JBT · Postby **JBT** » Wed Feb 01, 2012 8:17 am

Auto NC has no LSD. It is also a lower final drive ratio - 3.727 for manual vs 4.1 for the auto. However, 6th gear in the auto is 0.582:1 vs 0.832:1 for the manual.

barneywomble · Postby **barneywomble** » Wed Feb 01, 2012 9:56 am

Hi JBT, thanks for the details on the auto. is there anyone on the forum who is a transmission guru...? Also do you know what the actual model of the auto trans is that came in the NC's ?

thanks
barneywomble

JBT · Postby **JBT** » Wed Feb 01, 2012 12:09 pm

I can't answer those questions. Maybe visit MX-5 Plus (see link at bottom of page) and see what/who they know.

pcmx5 · Postby **pcmx5** » Wed Feb 01, 2012 12:40 pm

If you decide you want an LSD and assuming that the centre in the manual and the auto are the same size I have a diff that came out of a manual at 42000 klms that i am going to pull apart and sell the CWP but will have the LSD available.

Sorry I cannot help with the other questions,

Peter.

barneywomble · Postby **barneywomble** » Wed Feb 01, 2012 1:18 pm

pcmx5 wrote:If you decide you want an LSD and assuming that the centre in the manual and the auto are the same size I have a diff that came out of a manual at 42000 klms that i am going to pull apart and sell the CWP but will have the LSD available.

Sorry I cannot help with the other questions,

Peter.

thanks for the offer peter, I will go and have a chat with the folks at mx-5 plus and see what i have and what i can do with it as far as the diff goes.

regards,
barneywomble