Chavo60,
I know this thread is a few years old however thank you for posting this on a easily found forum!
I am currently looking to upgrade my 2015 Journey for the wife! The wrig is equipped with a SAT 4.3 radio.
I have noted your issues and know what to look out for.
I plan on buying the 8.4 radio, mated climate control module, bezels to match. I will update once parts have been installed.
Thanks again!