Yes I've replaced the tranny fluid 3 times over the winter. (I know one
change doesnt get all the fluid out.)  Using Hondas ATF fluid.

Again I may not be accuratly repeating what the mechanic said.

Sounds like what he's saying is due to the bad cat, the O2 sensors are
sending a signal that may be causing the computer to shift at the wrong
time??? or the engine to rev a little higher before shifts??

The tranny issue is hard for me to tell if its a real problem.
Seems at low speed ( 10 - 20 mph ) I take my foot off the gas, coast/brake a
little then when I hit the gas again it sometimes seems to rather abruptly
go into gear.

I've done plenty of research on the 6th generation Accord transmissions but
that doesnt replace actually driving the car and knowing what a developing
tranny problem might FEEL like..

For example, I though my old used camry had a funny feel when shifting. I
brought it to a dealer who said No problem he could find. while in for other
work I mentioned it to my mechanic who traced it to a missfireing plug, I
think it was a coil???  ( he drove around with his computer hooked up to the
car and found it that way.)
What I felt went away after that!  So what I thought all along was a tranny
problem wasnt...
Bottom line is ignorance on my part...I have to go with the opinion of the
mechanic who has driven the car.

I just wanted to bounce this off you guys and hopefully educate myself a
little more...

Thanks Again

Steve