Most likeley you still have water trapped in your valvebody somewhere, i know on the diesel website im on alot of guys had coolant leak into the trans and anyone its happened to never had good results trying to flush it out.
X2. Mine was filled with creek water (eye roll). I drained and refilled twice without good results (not proper flushing), then paid a transmission shop to completely flush it. My transmission lasted 1 year to the month after that incident. Do your due diligence now and hope for the best, but be prepared for extensive maintenance in the near future.
