An electric fan in front of your New trans cooler will lower temps about 25-35 degrees, both sitting at a light and driving down the road.
Ask me how I know..... :cowboy:
Not sure how you get that much cooling from a fan. I too have a pusher fan on my in line tranny cooler and it doesn't do jack. I really wish it did. Im regularly over 200 right now in the summer months. Currently 100 degrees outside and was pushing 210. I almost feel like I need another cooler. I've already got the bigger one.