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The FS5R90A is Nissan's version of the Borg Warner T5. It shares lots of parts with the Ford Non-World Class T5.

Used in 84-86 Z31 Turbos.

It has been generally regarded that the FS5R90A transmission is not very strong in stock form. People seem to blow these up with as little as 300 horsepower. The good side is they are cheap to rebuild. Rebuild kits are as cheap as $125 on ebay. Any short throw shifter made for the 5-speed Mustang will work fine in this transmission.