ORIGINAL: KICKINDIRT
It sounds like the diff is stripped,because it will turn the wheels when lifted off the ground,but when you set it down nothing happens
There is no center diff, and it isn't gonna strip them BOTH at EXACTLY the same time. If only one stripped, it would move when on the ground.
I know he says he doesn't see damage but remeber, the spur's edges will wear down, don't look for missing teeth...