The differential cover is a 1 piece 3/8" (.375") plate steel cap bent 8 ways then welded to a 1/2" ring, we had to make it thicker to make enough room for the thickness of the cover, it just happens to make it 30% stronger too! The fill plug is a generous 3/4" ID for easy fill and oil level check. This is arguably the strongest diff cover made for a Dana 30 axle.
Product make by Ruffstuff Specialties. Best diff covers on the market, sold here for your convenience.