It has been done, and there is not real benefit. There is a considerable amount of work to be done (input shaft needs to be modified and resplined for instance).
Changing the differential (a GTUs 4.33 gear ratio) is a good idea, and easier.
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1976 Mazda Cosmo RX-5
1976 Mazda Cosmo RX-5
2003 Toyota Tundra TRD
2015 Toyota 4Runner SR5
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