Both sides will have hot fluid flowing through them especially after the trans warms up. You probably mean you want to use the return line to connect to your cooler. Using the Return line means that the fluid going to your cooler has already passed through the radiator. I have never checked but I have been told the return line is on the driver side of the radiator.
4l60e cools from bottom up. Look on passenger side of trans and follow the bottom line. Thats the one flowing to the trans.
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