Well I'm feeling a little foolish for making such a big deal out of this. It's starting to seem that I can do just about everything I want, or probably should do with root explorer/astro/mount sd to computer.
I read through the entire process and it seems like they were just using abd to move the files. I have heard that some things wont work as well if you copy and paste with these programs, but this worked great. I just put the zip file at the root of sd card from the computer, rebooted holding down volume, it asked me if I wanted to update splash1, I said yes and now no more sprint 4g garbage. It's my official mission to get rid of everything that says sprint on my phone just out of principal.
Thats some great info akazabam! I'll definitely be trying this soon!
I think that we might have the same splash surfologist87, those macos screens are awesome! I have the one that has the metal bar in the middle with the andriod robot. I cant wait to start flashing new roms, this customization is incredible.