Re: blown rear diff!
I had mine go on Sunday at Moab as well...but didn't notice until after I was off the trail.
In light of what was said here, I drove it home to SLC but am claiming my ignorance on that dumb decision because I wasn't exactly sure what the problem was in the 1st place. Regardless I did make it home and took it down to the dealership today and they confirmed its likely the Rear Diff, but have not heard back yet.
2007 Silver MT:
TRD Exhaust, 3" OME lift, 17 inch wheels, 33" Toyo AT Tires, E-Locker, Demello Tube Sliders, All-Pro Skids for: IFS, Tranny, Transfer-Case, and Lower Control Arm mounts.