Thanks!
After a lot more re searching and trial and error- I went from not even knowing how to use activesync to now being able to flash cooked roms and back to stock and relock easily.
(as if it was that hard huh?) So I feel pretty acomplished
I did notice that on the replacement phone, the bootloader screen now reads SPL-0.40.0000 where the old phone read SPL-0.30.0000 (after using the sprint re-locker)
Is this just a new lock on the phone vs my previous phone?
And if I were to flash a cooked rom and then have to flash to stock/relock, do you think it'll make a difference if I use the re-locker that will read 0.30 and not 0.40?
I'll research more in the meantime, I just didn't want to start a thread just for that question.
Thanks again