Would you be willing to answer a few brief questions about PlayStation Forums?
Here it is in point form below:
So if I buy Playstation Plus, would I be able to put in the old hard drive, upload the saves, go back to the new hard drive, and re-download them?
That's all I need to know, thank you in advance
Nope, as soon as u put the HDD in your new PS3 it will reformat it and thus wipe the data on it. Did you get YLOD? There are some reputable sites that will repair it for as low as $60 or so and so it might be worth looking into that. Good luck.