I want to flush out my tranny, so i can make the switch to honda MTF...

So im thinkin of 2 or 3 options, what would be best?

1.Change the oil, run for a while and then change and put in honda MTF

2. Do same as abouve but add in seafoam of somting to clean everythign out in there.

or 3. Change to honda MTF, run it for a few miles and change again to flush it out...