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Will this cap allow water to get into the dif when mudding?Can i add a hose to it and route it out of the way of any water


If you are afraid of water getting in water, simply remove the cap run a length of tubing (rubber gas line woks good) up to a point above the water line and install the cap on the end of the tube.

Don't forget to put dielectric grease on all your connectors and sensors as well, nothing worse than stalling out in a mud hole cause something electrical got wet!

08' Jeep Wrangler
64' Plymouth Sport Fury 383
58' Triumph TR-3A