Fluid explosion in the rear

[06MountaineerPA]

Since I have to change my hub bearing on the right rear. I was looking at all the nuts and bolts I would have to get to and, I noticed what I call a fluid explosion on the underside of the truck around the rear diff. Did the rear axle seal let go? It seems to be more on the right side of the diff then all around. So Im guessing its just the right side seal.

Any tips or tricks to doing a axle seal on an AWD rear diff?

 

[swshawaii]

Most likely the passenger side axle seal if it's thick gear oil. Leaking caliper, rubber hose, or metal hard line if it's lighter brake fluid.