I was out running my truck earlier and a rock got wedged under the 4WD shaftbehind the engine (I'm tired and can't think of what its called). I didn't realize it a first until I noticed that the right rear wheel wasn't going when I hit the throttle. About 3-4 minutes later, the left rear wheel stopped going as well. Now that its off, the left rear will spin about 1 full revolution and then lock up. The right rear spins freely without stopping. I want to take it apart tomorrow, but I don't have a lot of time so I want to make sure I am looking at the correct thing. It's the rear differential, right? And just so I can sleep tonight , is it most likely just one of the small gears inside got strippedor could I be looking at replacing the entire diff? The XL diff seems kinda pricey. Thanks!

-Edit- It is definitely not the dogbones, they are still intact.</p>