Rear Main Seal Dodge Cummins

The Rear Main Seal Dodge Cummins (MAHLE ORIGINAL/CLEVITE part 48384) is a critical engine seal engineered for the legendary 5.9L and 6.7L Cummins diesel platforms found in Dodge trucks. This OEM-quality seal prevents catastrophic oil leakage at the crankshaft's aft position, where engine block meets transmission bell housing. Whether you're running a 24-valve or common-rail Cummins, a compromised rear main seal leads to oil loss, potential bearing damage, and costly engine overhauls—making this a non-negotiable maintenance item for any Cummins owner serious about longevity.

Built as a one-piece design with a rubber core and PTFE (polytetrafluoroethylene) coating, this rear main seal delivers superior sealing geometry and thermal stability across the extreme operating conditions Cummins engines endure. The PTFE outer layer reduces friction against the crankshaft while maintaining a tight seal under high oil pressure and elevated engine temperatures common to diesel performance and towing applications. Unlike two-piece rope seals prone to leakage, the modern one-piece construction eliminates mid-seal separation and provides consistent performance across stock and lightly modified power outputs.

Installation of the Rear Main Seal Dodge Cummins requires engine oil pan removal and partial transmission separation—a job best handled during major service intervals, transmission work, or clutch replacement. Diesel enthusiasts and independent mechanics trust MAHLE ORIGINAL/CLEVITE's OEM-equivalent quality as a standard replacement during in-frame engine overhauls or when existing seals begin seeping. This seal's compatibility across both 5.9L and 6.7L platforms makes it essential inventory for shops serving the Dodge diesel community and owner-operators looking to eliminate rear-end oil staining before it becomes a larger problem.