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Perhaps nothing will ruin a gearhead’s day faster than a dark oily spot on the garage floor from a leaking rear main seal. And since replacing a rear main seal isn’t...
Perhaps nothing will ruin a gearhead’s day faster than a dark oily spot on the garage floor from a leaking rear main seal. And since replacing a rear main seal isn’t typically the easiest job, make sure your rear main seal repair goes right the first time by getting quality rear main seals from Summit Racing.
Whether you need a rear main seal for a Jeep 4.0L, the ubiquitous “SBC” small block Chevy 350, GM LS, Ford Windsor, Mopar LA, or whatever’s under your hood, you’ll find engine rear main seals for virtually every popular motor, often with one- and two-piece rear main seal options.
An engine rear main seal is a critical...
Perhaps nothing will ruin a gearhead’s day faster than a dark oily spot on the garage floor from a leaking rear main seal. And since replacing a rear main seal isn’t typically the easiest job, make sure your rear main seal repair goes right the first time by getting quality rear main seals from Summit Racing.
Whether you need a rear main seal for a Jeep 4.0L, the ubiquitous “SBC” small block Chevy 350, GM LS, Ford Windsor, Mopar LA, or whatever’s under your hood, you’ll find engine rear main seals for virtually every popular motor, often with one- and two-piece rear main seal options.
An engine rear main seal is a critical seal that ensures oil from the motor doesn’t seep past the crankshaft, into the transmission or onto your garage floor. Rear main seals often dry out with age, become brittle, and crack—particularly on cars and trucks that don’t get driven often. But if you notice a leak or drip from your engine’s rear main seal, don’t immediately think a rear main seal replacement is necessary. Try driving around for a week or two. There’s a chance your seal has dried out from sitting too long, and running your engine regularly for a little while may recoat it with oil, saturate the material again, and restore the seal.
Additionally, make absolutely sure your leak is from the rear main seal in the first place—it’s not uncommon for weeping valve cover gaskets or distributor seals to be misdiagnosed as rear main seal leaks. (And those are much, much easier to fix.) So, confirm that your leak is coming off the rear main first before starting down the road to a rear main seal repair.
For a lot of older engines though, their original rear main seals will often need to be replaced as they age. And a rear main seal repair can be a cumbersome, time-consuming job, so it makes sense to replace your engine’s rear main seal with a good replacement seal to ensure you don’t have to repeat the job anytime soon.
If your SBC Chevy, 351 Ford, Jeep 4.0L, or GM LS has a rear main seal that’s starting to mark its territory, replace it with a quality replacement rear main seal from Summit Racing. See all your rear main seal options here.
Showing In Stock Items. Show All 164 Items.
Rear Main Seals, Original, One-piece, Viton®, Chevy, Small Block LS, Each
Part Number: MAH-JV1657
Estimated Ship Date: Today
Estimated Ship Date: Today
Rear Main Seal, 1 Piece, Buick, Chevy, GMC, Pontiac, Saab, LS Engine, Each
Part Number: NAL-89060436
Estimated Ship Date: Today
Estimated Ship Date: Today
Rear Main Seal, 1-Piece, Rubber, Ford, Small Block, Each
Part Number: FEL-BS40620
Estimated Ship Date: Today
Estimated Ship Date: Today
Estimated Ship Date: Today
Rear Main Seal, 1-Piece, Rubber, Ford, Lincoln, Mercury/Mazda, L4/V6/V8/V10, Each
Part Number: FEL-BS40644
Estimated Ship Date: Today
Estimated Ship Date: Today
Rear Main Seal, Original, One-Piece, PTFE, Ford Style, Each
Part Number: MAH-JV1635
Estimated Ship Date: Today
Estimated Ship Date: Today
Rear Main Seals, GM Genuine Parts, Crankshaft Rear Oil Seal, One-piece, Cadillac, Chevrolet, GMC, Each
Part Number: ADO-12665076
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Estimated Ship Date: Today
Rear Main Seal, 1-Piece, Rubber, Each
Part Number: FEL-BS40729
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Engine Crankshaft Seal, Engine Crankshaft Seal, Seal ASM-CR/SHF RR Oil, Each
Part Number: ADO-12592195
Estimated Ship Date: Today
Estimated Ship Date: Today
Rear Main Seal, One-piece, Rubber, Avanti, Ford, Jaguar, Laforza, Lincoln, Mazda, Mercury, Merkur, Panoz, Qvale, Each
Part Number: MAH-JV523
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Seal, Rear Main, One Piece, Rubber, Stock Replacement, Cadillac, Chevrolet, GMC, Car, Truck, Each
Part Number: ADO-12627520
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Estimated Ship Date: Today
Rear Main Seal, 1-Piece, Rubber, Each
Part Number: FEL-BS40464
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
FRONT COVER CRANK SEAL
Part Number: NAL-12634614
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Rear Main Seal, 1-Piece, Rubber, Ford, Mazda, Mercury, Morgan, Each
Part Number: FEL-BS40158
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Crankshaft Seal, Rear, 1-piece, Rubber, Dodge, Jeep, Ram, 3.7L, 4.7L, Each
Part Number: CWA-53020788
Not Yet Reviewed
Estimated Ship Date: Dec 15, 2025 if ordered today
Estimated Ship Date: Dec 15, 2025 if ordered today
Engine Crankshaft Seal
Part Number: MAH-68115
Not Yet Reviewed
Estimated Ship Date: Oct 24, 2025 if ordered today
Estimated Ship Date: Oct 24, 2025 if ordered today
Rear Main Seal, 1-Piece, Rubber, Each
Part Number: FEL-BS40690
Not Yet Reviewed
Estimated Ship Date: Oct 15, 2025 if ordered today
Estimated Ship Date: Oct 15, 2025 if ordered today
SEAL
Part Number: NAL-12591866
Not Yet Reviewed
Estimated Ship Date: Jan 19, 2026 if ordered today
Estimated Ship Date: Jan 19, 2026 if ordered today
Engine Crankshaft Seal
Part Number: NAL-12608750
Not Yet Reviewed
Estimated Ship Date: Jan 19, 2026 if ordered today
Estimated Ship Date: Jan 19, 2026 if ordered today
Engine Main Bearing Gasket Set, Engine Main Bearing Gasket Set
Part Number: MAH-JV1757
Not Yet Reviewed
Estimated Ship Date: Oct 27, 2025 if ordered today
Estimated Ship Date: Oct 27, 2025 if ordered today
Seal, Crankshaft Seal;
Part Number: CWA-5047167AA
Not Yet Reviewed
Estimated Ship Date: Dec 15, 2025 if ordered today
Estimated Ship Date: Dec 15, 2025 if ordered today
Crankshaft Retainer & Seal Kit
Part Number: CWA-68031388AA
Not Yet Reviewed
Estimated Ship Date: Dec 15, 2025 if ordered today
Estimated Ship Date: Dec 15, 2025 if ordered today
Crankshaft Rear Seal
Part Number: RNB-635-327
Not Yet Reviewed
Estimated Ship Date: Oct 13, 2025 if ordered today
Estimated Ship Date: Oct 13, 2025 if ordered today
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