Rear Main Seal Kit Mopar Gen-III Hemi

The Rear Main Seal Kit Mopar Gen-III Hemi is an essential engine block component designed for anyone maintaining or rebuilding a Dodge, Chrysler, or Jeep vehicle powered by the legendary Gen-III Hemi engine family. This kit addresses one of the most common wear points in high-performance and stock Hemi engines—the rear crankshaft seal—where oil leakage becomes problematic as mileage accumulates or aftermarket boost pressure stresses the seal surfaces. Whether you're performing preventive maintenance during a full engine refresh or addressing an existing weep, this seal kit delivers OEM-specification reliability without the dealership markup.

Engineered to factory tolerances, the Rear Main Seal Kit Mopar Gen-III Hemi provides a precision elastomer seal that withstands sustained oil pressure and temperature cycling inherent to Hemi combustion chambers. The kit includes all gaskets and sealing surfaces necessary for a clean installation between the transmission bell housing and engine block, eliminating the need for secondary sourcing or improvisation. The compact 7-inch length and lightweight 0.25 lb construction ensure hassle-free shipment and storage, while the design accommodates both stock and lightly modified engines running standard or synthetic blend oils without degradation of the seal material.

This kit is ideal for DIY builders, professional shops, and fleet operators maintaining Gen-III Hemi powerplants in 2003-and-later Dodge Ram trucks, Chargers, Challengers, 300Cs, and Jeep Grand Cherokees. Installation requires transmission removal on most applications, making this an opportune upgrade during major service intervals or when transmission work is already planned. Proper installation prevents costly oil seepage onto transmission housings, preserves engine bay cleanliness, and maintains correct oil levels critical for Hemi longevity under both street and performance driving conditions.