"goose22" wrote in message

My question is: Do I need to rip out all the 2x4 on the concrete floor and
replace them with treated wood?

Once the work is done I will use a dehumidifier in the summer. I live in
Chicago if that means anything.

Before pressure treaded wood was available, millions of homeowners did
exactly what you did and never had a problem. While PT may be better, I
don't think it is needed in most cases. Keep the basement dry and you
should be good for many happy years of use.