Water in rear differential gears

I have a 2004 Dodge Dakota, at 25,000 miles the rear differential gears were rebuilt because of water in the lubricant. At 50,000 miles I had the lubricant in the rear gears changed.

Again, the dealer told me there was water in the lubricant. This vehicle has never been in the water. No one seems to know how the water is getting in the rearend. I would like to correct this probllem, but I need to first determine how the water is entering the rear differential. I would appreciate an help.

Is the vent tube properly connected and routed? There shouldn’t be any other opening in the differential case than this vent.

Yeah. What NYBo said.