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Oil Leak



I have developed an oil leak at the 2" plug just above the fill hole at my front axle. This plug has a 1/4" tube leading out of it. Anyone know what this is for? Anyone had this problem?
Jogle, I had to take a guess and say it is probably a vent tube to release pressure/heat buildup out of the housing............Had to take a guess and will wait and see what the experts come up with.
MY .02 cents worth
I haven't crawled underneath yet to confirm, but I believe this will be a vent as Zeeya stated. Nearly all diffs have one type or another.
It is difinately the vent tube. It goes up into the engine compartment. The end of it is by the right side of the radiator. It has a vent cap on the end of it.