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Mazda 6 speed gearbox.


blue

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Ok. I am using a st150 engine and used a mk3 mx5 NC gearbox. I also do have a very early zero chassis (3rd chassis they ever made). 

Might be differences in newer chassis but I am not aware of a ns 5 speed. 

I have pictures to prove it didn’t originally fit in my chassis. Does now 😉

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Agree, I tried that originally.  I tried both the  NA and a NB gearbox.  They do not fit, and would need an adapter plate and large amount of work.  I have a 5 speed NB gearbox in the shed if anyone wants a cheap gearbox!!  I took all my original advise from GBS, but it really didn't pan out as they explained it might.

Edited by Thrashed
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4 hours ago, Thrashed said:

Ok. I am using a st150 engine and used a mk3 mx5 NC gearbox. I also do have a very early zero chassis (3rd chassis they ever made). 

Might be differences in newer chassis but I am not aware of a ns 5 speed. 

I have pictures to prove it didn’t originally fit in my chassis. Does now 😉

Hi that’s the same setup I’m thinking of using 

what mods 😜 did you have to make pls as mine is an early chassis 

does the NC 6speed fit or just the 5 pls. 

Edited by blue
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44 minutes ago, blue said:

Hi that’s the same setup I’m thinking of using 

what mods 😜 did you have to make pls as mine is an early chassis 

does the NC 6speed fit or just the 5 pls. 

Yes, the 6 speed will fit the Duratec, based on my research, but fitting it into the chassis is a whole different issue!

The casing for a 6 speed box is much bigger than a 5 speed.  The 5 speed bellhousing catches the tunnel uprights and the reverse detent house clashes with an upright rail.  The gearbox mounts are all in the wrong place.  The type 9 mount it too high and too far forward and you then have to chop of some of the gearbox webbing to fit in the tunnel.

In short I moved 2 uprights, added an extra upright and remade the gearbox mounting plate.  The MX5 NC bellhousing is just too big for the original tunnel.

Feel free to PM me and I will happy give my phone number to chat it though, I have a `diary' I have been keeping which is kind of a build blog, I would be happy to share.

Edited by Thrashed
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