I dont think it will be easy. Other than the final drive (differential gear) it's not as simple as swapping out a gear inside, is my understanding.
It's possible to have different specced gears from the factory, however. In the same transmission. I know that my 4EAT has quite a few, but of course every transmission is unique as far as that goes, you'll probably have to get ahold of some factory service manuals to find out or get on a forum that is well versed in that specific car.
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