Rear Main Seals

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...

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.

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SCE Gaskets Rear Main Seals 21355

SCE Gaskets Rear Main Seals 21355

PRO SL BBC RR MAIN SL 1991-UP , EA.

Part Number: SCE-21355

Not Yet Reviewed

Estimated Ship Date: Mar 18, 2026 if ordered today

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Estimated Ship Date: Mar 18, 2026 if ordered today

Fel-Pro Performance Rear Main Bearing Seals 2918

Rear Main Seal, 2-Piece, Viton®, Chevy, Big Block, Each

Part Number: FEL-2918

4.43 out of 5 stars ( 23 )

Estimated Ship Date: Tomorrow

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Fel-Pro Performance Rear Main Bearing Seals 2904

Rear Main Seal, 2-Piece, Silicone, Buick V6, Chevy Big Block, Each

Part Number: FEL-2904

4.52 out of 5 stars ( 21 )

Estimated Ship Date: Tomorrow

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Fel-Pro Performance Rear Main Bearing Seals 2920

Rear Main Seal, 1-Piece, Viton®, Chevy, Big Block, Each

Part Number: FEL-2920

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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SCE AccuSeal Pro Rear Main Seals 21305

Rear Main Seal, 2-Piece, Viton®, Chevy, Big Block V8, Each

Part Number: SCE-21305

Not Yet Reviewed

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Fel-Pro Rear Main Seals BS 40096-1

Rear Main Seal, 2-Piece, Rubber, Chevy, Each

Part Number: FEL-BS400961

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Tomorrow

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Peterson Fluid Systems Engine Seals SM86665

Rear Main Seal, Crank Seal, PTFE, Chevrolet, Each

Part Number: PFF-SM86665

Not Yet Reviewed

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Fel-Pro Rear Main Seals BS 40622

Rear Main Seal, 1-Piece, Rubber, Chevy, GMC, 7.4L/454, Each

Part Number: FEL-BS40622

4.67 out of 5 stars ( 3 )

Estimated Ship Date: Tomorrow

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Fel-Pro Marine Rear Main Seals 17740

Rear Main Seal, 2-piece Style, Rubber, Reverse Rotation Seal for Marine Only, Chevy, Big Block, Each

Part Number: FEL-17740

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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SCE AccuSeal E Rear Main Seals 11305

Rear Main Seal, AccuSeal E, 2-piece, Silicone, Chevy, Big Block, Each

Part Number: SCE-11305

Not Yet Reviewed

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Fel-Pro Rear Main Seals BS 40673

Rear Main Seal, 1-Piece, Rubber, Chevy, GMC, Each

Part Number: FEL-BS40673

Not Yet Reviewed

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Chevrolet Performance Rear Main Seals for 1996 P3500 - 6264902

Rear Main Cap O-Ring, Chevy, Big Block, Gen V, Gen VI, Each

Part Number: NAL-6264902

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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Mahle Original Rear Main Seals JV1614

Rear Main Seal, 1-Piece, Rubber, Chevy, Big Block, Each

Part Number: MAH-JV1614

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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SCE Rear Main Seal Cover Gaskets 21305R

Rear Main Seal, 2-Piece, Viton®, Chevrolet, Big Block, Each

Part Number: SCE-21305R

Not Yet Reviewed

Estimated Ship Date: Mar 18, 2026 if ordered today

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Estimated Ship Date: Mar 18, 2026 if ordered today

Chevrolet Performance Rear Main Seals 10101164

SEAL ASM-

Part Number: NAL-10101164

Not Yet Reviewed

Estimated Ship Date: Jun 1, 2026 if ordered today

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Estimated Ship Date: Jun 1, 2026 if ordered today

Engine Works Rear Main Seals 176396V-10

Rear Main Seal, 2-Piece, Viton®, Chevy, Big Block, Set of 10

Part Number: EW1-176396V-10

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Engine Works Rear Main Seals 176396

Rear Main Seal, 2-Piece, Silicone, Chevy, Big Block, Each

Part Number: EW1-176396

Not Yet Reviewed

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Engine Works Rear Main Seals 176396V

Rear Main Seal, 2-Piece, Viton®, Chevy, Big Block, Each

Part Number: EW1-176396V

Not Yet Reviewed

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SCE AccuSeal Pro Rear Main Seals 21355-10

Rear Main Seal, AccuSeal Pro, 2-Piece, Viton®, Dyno-Pak, Chevy, Big Block, Set of 10

Part Number: SCE-21355-10

Not Yet Reviewed

Estimated Ship Date: Mar 18, 2026 if ordered today

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Estimated Ship Date: Mar 18, 2026 if ordered today

SCE AccuSeal Pro Rear Main Seals 21305-10

Rear Main Seal, 2-Piece, Viton®, Chevy, Big Block V8, Set of 10

Part Number: SCE-21305-10

Not Yet Reviewed

Estimated Ship Date: Mar 19, 2026 if ordered today

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Estimated Ship Date: Mar 19, 2026 if ordered today

Cometic Rear Main Seals C5682

Rear Main Seal, 2-piece Style, Viton®, Chevy, Big Block, Each

Part Number: CGT-C5682

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Mahle Original Rear Main Seals JV1627

Rear Main Seal, Rubber, 2-Piece, Chevy, GMC, Each

Part Number: MAH-JV1627

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tomorrow

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Mahle Original Rear Main Seals JV705

Rear Main Seals, 2-piece, Rubber, Cadillac, Chevrolet, GMC, ISO, Each

Part Number: MAH-JV705

3.5 out of 5 stars ( 2 )

Estimated Ship Date: Tomorrow

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