When my car sits for a few days the rear end fluid some how flows up the vent tube drips on the floor. My vent tube runs up to the floor board and has a filter mounted on the end. I've checked the fluid level several times and it is not overfilled. This only happens when the car sits for 5 days to a week. Any ideas?

Are you using 2 1/2 quarts of lube?

If the fluid is level with the fill plug, you are running too much.