Have a small rear differential leak and now its throwing gear oil up under the van. Level was ok so must be new. Checked the breather plug on top the differential and of course it was totally plugged and rusted shut, which I assume is the cause of my leak. No oil at the rear wheels or axle. I replaced the breather plug but still leaking so am doing the rear pinion seal.

Checked my other van and the breather plug was clogged as well, but no leak yet. Wise to check differential for any leaks and check level and make sure breather plug is open and not frozen before any leaks develop. I used a 6 point 24mm socket after spraying rust penetrant to get fill plug off cause its easy to round it off.