Any Mazda "Type M" transmission can be swapped in (all N/A RX-7'd, old B-series pickups, '04 and earlier Miatas, RWD 626's, etc.). This makes any number of gear ratios available. You can even mix/match 5th and reverse gears if you'd like. You will have to swap the housings (bell, intermediate, and extension) and also pay attention to the length of the input shaft. You can't swap the input shafts but you can turn down the longer ones to RX-7 specifications.
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