Okay, here's what I did.
Copied everything from the old 10gig drive onto my computer. Unlocked the drive using my modchip's menu.
Stuck the New drive on my Modded X-box. Formatted it and copied back everything from my old 10gig drive onto it using the Computer as a holding pen and Smart FTP.
Soldered an old 2.3 lite xecuter chip on the newer xbox. It was a 1.0 version so it took like 3 minutes to do all the soldering. FTP'ed to it, put config magic on it.
Booted it up, locked the 10gig drive using Config Magic. Booted it up with the modchip off. Soft modded it using the UXE method.
Removed the modchip. Put everything back together, booted it up and boom, it was all set.