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Originally Posted by beached_titan
i am convinced that the leaks are coming from the pressure build up inside the axle, both vaccum and release. the one way little crap *** check valve that nissan decided to use for a vent valve may be doing an ok job at releasing pressure, but what happens when the diff cools down and all the pressure inside has been released? the check valve is not letting air back in.... all other trucks have a hose that runs up under the bed, why not the titan? i ran my own vent tube up to the fuel tank. we shall see if this has any effects on the longevity of my axle seals...
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I agree with your suspicion. I have a '4KCXE, no leaks yet, but I plan to do the axle vent mod, add an aluminum cover and replace the fluid with synthetic this fall.