Updating Cuore 3 Speed Auto

Hi all!

I recently picked up a 2001 Daihatsu Cuore 1.0 + Auto. It’s currently got a 3 speed auto which works great around town but as you can imagine, it absolutely screams when you drive above 60mph.

So my question is, can you replace the 3 speed auto with something more modern, anyone tried anything like that? Just curious really, would like to pursue it in the future.

Thank you all!


a sirion 4 speed auto should fit I think. or change it to manual?