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if you are submersing the rear end you might pick up some water, easy to pull the fill plug stick in a finger or whatever and look to see if the gear oil is milky colored if so change it if not your good to go. rear end oil should be changed every 100k or so
at most i might check it like has been said, but i used to take my trucks off road alot and always had it submerged, never had an axle go that way. my older truck had a breather on a hose, look and see if yours does, you want that as high as possible
if its a toyota i would check it because it has a breather on the top of the axle on left side just to be sure easy preventive maintance and if your towning alot it doesnt hurt to change it check your factory schuedule maintance for your vehicle should tell you when to change it for towing
It is a yota I will look for that breather thanks!