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-   -   miata 5sp internals in fc 5sp (https://rotarycarclub.com/showthread.php?t=8269)

Black91n/a 11-23-2009 07:33 AM

Quote:

Originally Posted by fc nut (Post 102584)
so, a 12a trans internals will work or do you mean just bolt the trans to my engine? i didn't know they were interchangeable. do i need the driveshaft as well?

You need to change the tail shaft housing so that the trans will bolt to the crossmember and so that the shifter is in the same place. You can also change the front section, but I don't think it's required.

fc nut 11-24-2009 12:09 AM

which year would be a good strong 12A trans? what about the GSL SE trans?

Black91n/a 11-24-2009 06:24 AM

I'd pick the one with the best gearing, but if there's a difference in strength, the later one's are probably slightly preferable.

Whizbang 12-29-2009 12:37 PM

Quote:

Originally Posted by fc nut (Post 102717)
which year would be a good strong 12A trans? what about the GSL SE trans?

gslse transmission has no real differences as far as strength is concerned.

Just a different fifth gear. (these are for 84-85)

12a 5th: 0.758

13b 5th: 0.807

fc nut 01-06-2010 01:20 AM

i want a 5th gear that my car doesn't fall on it's face after i run 4th gear out.

TitaniumTT 01-06-2010 09:51 AM

Isn't that the point of an OVERDRIVE?

Buy a J-Spec S5 TII trans - .84 overdrive. Personally I'd rather have something in the low .7's for my car, get a little better highway mpg's

fc nut 01-07-2010 12:40 AM

i don't care too much for OD.the problem i have and any other n/a car, after i shift at 120 from 4th it barely accelerates. i want it to keep accelerating if i want it to.

TitaniumTT 01-07-2010 03:54 AM

make more hp or change the final drive ratio

fc nut 01-12-2010 08:46 PM

true. i need to replace my trany anyway. power is on my to do list.

fc nut 07-17-2010 08:03 PM

well,i picked up another stock s4 trans yesterday. the price was right $50,so we'll see how it works. if it doesn't,i'll get a 12a trans.


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