i very quick fix that we use in the field when mud riding is axle grease.if for somereason you bust something and loose your fluid fill the houseing with grease til you get home. now after you get home and have the parts remoce the grease by flushing it out with a parts cleaner then fill with udtdon't try thins in the tranny though the pump won't pump the grease but for the fron difs it's is a fix that will get you home without damaging the rest of your stuff from running it dry.