PPE Heavy Duty Cast Aluminum Rear Differential Cover 20-26 GM 3.0L Duramax 1500

Need better protection and improved cooling for your rear differential? The PPE Heavy-Duty Cast Aluminum Rear Differential Cover is designed to strengthen the factory differential housing while helping reduce fluid temperatures under towing, hauling, and performance driving conditions. Excessive heat can degrade differential fluid over time, leading to increased wear on gears and bearings, especially in trucks that regularly tow heavy loads.

Built from premium heat-treated cast aluminum alloy, this differential cover is engineered for exceptional strength, rigidity, and thermal conductivity. The cover features half-inch external cooling fins that help dissipate heat more efficiently while also increasing impact resistance. Internal windage scrapers help control fluid movement around the gear, reducing fluid aeration, minimizing heat buildup, and improving lubrication efficiency under load. PPE also incorporates cast-in gussets and a reinforced cross-bracing structure to add rigidity and improve housing support. High-strength stainless steel magnetic drain and fill plugs with Viton O-rings capture metal particles and provide reliable sealing for long-term durability. Designed as a direct-fit replacement, this cover installs using factory mounting locations and increases fluid capacity for added thermal stability.