2014-2018 Ram HD Heavy Duty Cast Aluminum Front Differential Cover 2500/3500 HD Black (238042020)Description Made in the USA from high quality cast 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