For whatever reason mazda decided that the tranny in the NA would be realllllyyy close to it's power handling limit. In short it seems that most cars with over 120k have tranny's that are starting to work at less then great levels.



Oddly enough they seemed to have done the same thing with the TII tranny which makes you wonder why the TII tranny isn't in the NA and some other tranny that's got some strength isn't in the TII.



At any rate.



So assume that you've got a tranny that's slowly dying, what's a good fix? How much hell is it to put a TII tranny into an NA? Anyone know of a good rebuilt tranny that won't die in 100k? What about this fabled Miata tranny conversion?



Discuss.

A TII tranny in a good state can transfer 500hp just fine. What more do you want?

Miate conversion is just closer ratio gears. https://www.nopistons.com/forums/pub...IR#>/smile.png NA trannies are fine, when you rebuild them use the MAZDA OEM Bearings.

I have a S4 TII tranny if you want one, otherwise I would get yours rebuilt and let it go another 100k+ miles

how do you tell the difference between a turbo and n/a tranny and s4 and s5's arent interchangeable are they? also whats the difference on the turbo and N/a clutch

What does it take to swap a TII Tranny into an NA?



Do you have to replace the diff? Flywheel? Clutch? What?

you need...

flywheel

driveshaft

diff

slave

clutch and pp

half shafts

i think front counter weight





i think thats it

[quote name='nismo convert' date='Mar 22 2005, 02:14 AM']you need...

flywheel

driveshaft

diff

slave

clutch and pp

half shafts

i think front counter weight

i think thats it


[/quote]





You don't really need the diff, but the turbo driveshaft will have to be modified in order to bolt it on to the NA diff. If going this route, this will elimintae the use of T2 halfshafts.



BTW - I am using a NA slave on my T2 tranny.

[quote name='nismo convert' date='Mar 22 2005, 01:14 AM']i think front counter weight




[/quote]

https://www.nopistons.com/forums/pub...1047683561.gif







The starter is also different in the TII.

yes you need that as well





how are you using a n/a slave on a t2 tranny? the bolt pattern is totally different