Transmission Cooler/Water Issue

[tinydb84]

Hello all,

In finishing up my brother's LS swap on his Nova he got a new fancy aluminum radiator and connected it all up.

He connected one of the tranny cooling lines to the radiator drain instead of the second cooler line. We fired it up and it was leaking water (unrelated area) after a few seconds so we shut it down and noticed it had a ton of pink foam.

I am guessing we filled the trans with a good amount of water. What would be the best way to proceed with cleaning it all out?

Link filled with broken photobucket pics if you are interested: http://www.67-72chevytrucks.com/vboa...d.php?t=727985