Need help with K12 gearbox!

Hi,

Does anybody able to help me to find Nissan Micra K12 gearbox models and ratios?

Actually I was wondering whether K12 gear box counter shaft and main shaft fit with the K11 gearbox?

I'm running K11 March, but 4th gear acceleration is very low performance after all modifications done to ECU and etc.

Thanks.
 
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