yzf450 - wr450 transmission swap ?

i was just wondering if anyone could tell me if its possible in some way to swap my 03 yzf transmission out with a wr, or possibly get taller gearing out of it while retaining the bottom end.

I know the tranny fits a new YZ250, so it may be possible to do. My friends 250 is now a great off road bike.

You can swap the transmissions between the WR and the YZF.

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