The Ford Super Duty Dana M300 14-bolt heavy-duty cast aluminum rear differential cover is designed to help your truck run cooler, stronger, and more reliably under heavy use. Whether you’re towing, hauling, or putting miles on your Super Duty, this upgraded cover helps manage heat by increasing fluid capacity by 0.8 quarts and using deep external cooling fins to pull heat away more efficiently. That means more stable differential temperatures, better fluid protection, and improved long-term durability for your gears and bearings.

Inside the cover, built-in windage scrapers help control oil movement to reduce unnecessary churning. This lowers heat buildup and fluid aeration, which can improve efficiency and give the drivetrain a smoother, more consistent feel under load. The external fin design and internal structure also work together to reinforce the housing, adding strength and impact resistance for demanding driving conditions.

Built from high-strength A356.0-T6 cast aluminum, the cover is precision-engineered for a solid fit and long-lasting performance. Cast-in reinforcement points add extra rigidity, while stainless steel magnetic plugs help capture metal particles in the oil to protect internal components over time. With factory-level fill positioning and leak-resistant Viton O-ring seals, installation is simple, and maintenance stays hassle-free, making this a strong upgrade for both protection and peace of mind.