This is from AMSOIL's website (this is not Omega-specific):
'....You now have replaced the fluid in the pan. To replace the fluid in the torque converter and oil cooler also, follow these steps.
Step 1. Obtain the total system capacity of the vehicle
manufacturer or AMSOIL. Have this amount
readily available.
Step 2. Disconnect the oil cooler line from the oil cooler. As
you may not know which is the pressure side and
which is the return side, have both directed so the
stream of fluid will be directed toward a receptacle.
Step 3. With another person, be prepared to add ATF to the
fill area as it is being pumped out of the oil cooler
line.
Step 4. Start the engine, and as the old fluid is pumped out,
add fresh fluid to the pan.
Step 5. When either the fluid colour brightens or the total
capacity has been replaced, shut the engine off and
re-attach the oil cooler line. All fluids have now
been changed.'
Having said that, I am not aware of anyone on this forum that have actually tried this?