I'm sorry these aren't the best pictures and don't show the whole body, but they're the best I could get without handling the larva and I've heard the oils on my skin could damage it so I've not touched the larva at all if I can help it.
I found this under a log while collecting insects for my entomology class and I wasn't sure what it was especially because of its size (I'd guess it's at least a couple inches long) and I'd never seen a grub that big before, so I put it in a vial with some soil and showed it to my professor. As far as he can tell it's likely an eastern Hercules beetle. If it helps more, I'm in Western North Carolina up in the mountains. I found it about two weeks ago. Since finding it, I've been keeping it in a plastic container with some soil, a wet cotton ball for water, and decaying tree bark I pull off pretty soft tree stumps that it's been eating a lot of. I figure since it's definitely been eating the bark it must be pretty good.
I just wanted some other opinions on what it is and sorry I couldn't get a more full body picture without handling it. I've been trying to minimize how often I touch it.