On a 2004 Ford Expedition , 4x4 :
The front differential has a tube ( hose ) coming off the top of the differential
( the biggest part of the case where the gears are )
Is the fluid coming from the vent hose ? When the differential fluid gets warm , it expands , and sometimes can come out the vent tube ( especially if someone has " topped it up " when it is colder ) or is it leaking from a front axle seal ?
does a 1992 Chevy 2500 2wd differential have a vent tube
On a 2004 Ford Expedition : In the overhead console there is a button marked " VENT " ( that is used to open and close the power rear side windows )
It is a vent tube to let pressure out of the differential housing.
That hose is the differential vent hose. It is held onto the chassis up under the motor by a small clip. The hose does not attach to anything other than the differential.
I know there is a vent hose on the front differential of the 4x4 so if the differntial fluid expands too much when warmed up it makes quite a mess ( its happened twice on my 1995 XLT after having front axle seals changed and the front differential fluid was topped up ) I believe the automatic transmission also has a vent hose
That is a vent tube, It let's the pressure out of the differential so it don't blow the grease seals out.
In front of the fuel tank under the car...right in front of the fuel filter
That is the axle vent hose. It ties off to the body above the axle.
You would have to install a gauge on the differential vent, usually located at the top of the differential at the left side
Is it actually leaking from the axle seal or once it got warmed up did it shoot some fluid from the front differential vent hose ?
If you overfill an differential and it does not have a vent or the vent is plugged the oil, when it becomes hot and expands, will blow past the seals causing at a minimum a leak and at worst bearing damage. Always fill the differential to the bottom of the fill hole.