I had new 5.13 gears installed last September. To make a long story short the pinion seals have leaked a few times and have been replaced twice after the initial install. When they opened them up this last time they saw red mud caked in there and attributed the leak to that. WTF? Keep in mind that we have only wheeled 3-4 times since the install and 3 of those trails had Toyota Camry's on them!!! The installer has an outstanding reputation, so I'm confident it's not their fault. Are these things going to leak every time we get a little muddy or what?????