Fel-Pro BS40578 is a rear main seal gasket for sealing the rear engine crankshaft area and helping stop oil loss where the crankshaft exits the block. Built as an OEM-style replacement for stock rebuilds and street-driven repairs, it covers a wide range of 1979-2002 applications, including Jeep Cherokee, Comanche, CJ models, Dodge Dakota 2.5L, Pontiac Fiero 2.5L, Chevy S10, Astro, Camaro, and Buick Century platforms. Its application-specific design supports a dependable fit in real-world repair conditions.

Fel-Pro BS40578 Features:

• 1-piece rear main seal design replaces the crankshaft rear seal area with an application-specific part built for fit, form, and function.
• Viton rubber construction with a loop spring supports long service life and consistent sealing pressure at the crankshaft.
• OEM-style replacement is suited for stock engine rebuilds and street-driven cars and trucks, not race applications.
• Approximate .4 in. thickness and 1.6 oz. weight keep the seal compact while matching the intended repair location.
• Engineered for imperfect sealing surfaces often found during service work, helping technicians restore a reliable oil seal without changing the original design.

Includes:

• One 1-piece rear engine crankshaft seal

Best used during rear main seal service, engine resealing, or a stock rebuild where an OEM-style sealing solution is preferred. Inspect the crankshaft surface and surrounding gasket areas during installation, since related wear or surface damage can affect sealing performance.

Verify engine and vehicle application before installation. Confirmed coverage includes many American Motors, Buick, Chevy, Dodge, Eagle, GMC, Jeep, Oldsmobile, and Pontiac models from the late 1970s through early 2000s, with notable fitments such as 1996-2002 Dodge Dakota 2.5L L4, 1984-1988 Pontiac Fiero 2.5L L4, 1984-2000 Jeep Cherokee, 1986-1992 Jeep Comanche, 1980-1986 Jeep CJ7, 1985-1993 Chevy S10, 1985-1990 Chevy Astro, 1982-1986 Chevy Camaro, and 1982-1992 Buick Century.