Thank you gentlemen!
It sounds straight forward. I was concerned the trans cooler on the SS might present something unusual.
I will be sure to measure what drains out and put at least that much back in. I didn't know if it was possible to drain the cooler (a little radiator I guess?) and then need a special sequence in order to re-fill it completely or release any trapped air.
Thanks again.
And BTW- I'll be using Royal Purple Synchromax because of past positive results I've had with that brand.