Honda Civic Automatic Transmission?

The family has a 2001 Civic with 305,000Km and the automatic transmission is starting to break. I want to replace it instead of rebuilding it. I found a used automatic transmission from a store that imports transmissions from Japan. It only has about 60,000Km.

But they said its a 3 Speed automatic transmission without overdrive…

Is that going to be a problem? And did Japan use 3 speed automatic transmissions when they made the 01 Civic?
How will a 3 speed automatic differ from my current 4 speed automatic?

On Hondas don't bother with used transmissions they don't have a filter in them and have a very high failure rate. Not sure what to say about trannys from japan but the engines from over there are garbage and never taken care of and aren't meant to last because they are meant to go only 30k miles. I worked on a 99 accord 4cyl. I installed 3 used trannys into it until we finally got a good one.

I'm guessing the 2001 is computer controlled. It won't know how to control a 3 speed if it had a 4 speed in it. You should get a tranny from a local source if you are getting a used tranny.