I recently broke my rear differential on the way to work. Luckily, I made it there without losing my tire in 4H with power to the front wheels only. I'm thinking my transfer case is shot as the rear drive shaft doesn't spin at all regardless of what I'm in (2H, 4H, 4L). The rear drive shaft spins freely by hand, even when I have the shifter in gear, ie 1st gear, 2nd gear etc)...any ideas?