Transmission rebuild

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83 RX-7 Gsl, 2000 Mazda Protege LX, 2011 Mazda3 Sport i
Looking at rebuilding my trans but looking for the ford probe 5th gear. I plan on moving from Wisconsin to Arizona and would love to get better gas mileage with the probe 5th gear. Now if someone has the part number, the part itself, or more information on how this wont work I would heavily appreciate it!
 
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