Rear Differential Cover - Heavy-Duty Cast Aluminum - RAM/GMMade from high quality cast A356. 0 T6 aluminum for strength and optimum heat dissipation. PPEs differential covers offer industry leading fluid cooling. Equipped with internal heat sinks and external cooling fins, increasing the pans surface area helping dissipate heat. This makes for a much cooler and denser oil. Cool, dense fluid lubricates better, which will extend differential service life. To keep the fluid clean, PPE installed its exclusive