Today I decided to change the oil in the differentials, and extremely simple, yet I was careless while putting the fluid in the rear diff. I wasn't paying attention, grabbed a container of oil, proceeded to insert tip in fill hole when I realized it still had the cap on. My knee jerk reaction was quick, but the cap fell in! Now, I have a quart in already, knowing the cap is in there, also knowing an easy job just got more difficult! Well I salvaged most of the oil, pulled off the cover and realize I have no rtv seal left! Well, the moral of the story is, be prepared for the worst and remove the caps before ya start! Unbelievable!