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Stock Problems/IssuesDiscussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.
People have done it. Not sure it's very cost effective, i'd probably just swap out the gears with something aftermarket rather than changing the whole gearbox.
I think Some vendors sells custom gears, also you can grab gears from a focus. You would have to search to find the exact gearing ratios for the different boxes. (02-04/05-06/Focus) And of course while your at it get a new clutch and a lightened flywheel. Good winter project.