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.

Showing In Stock Items. Show All 57 Items.

Individual Parts

Part Groups

Results 1 - 25 of 41

SCE AccuSeal Pro Rear Main Seals 21105-10

SCE AccuSeal Pro Rear Main Seals 21105-10

DYNO PAK REAR MAIN SEAL SBC 2-PIECE VITON THRU '85 , EA.

Part Number: SCE-21105-10

Not Yet Reviewed

Estimated Ship Date: Mar 2, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 2, 2026 if ordered today

Peterson Fluid Systems Rear Main Seals SM86410

SEAL,SBC,REAR MAIN,SPLIT (400)

Part Number: PFF-SM86410

Not Yet Reviewed

Estimated Ship Date: Jan 27, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 27, 2026 if ordered today

Peterson Fluid Systems Rear Main Seals SM86626

SEAL,SBC,REAR CRANK,DBL SPLIT

Part Number: PFF-SM86626

Not Yet Reviewed

Estimated Ship Date: Jan 27, 2026 if ordered today

...Loading

Estimated Ship Date: Jan 27, 2026 if ordered today

SCE Gaskets Rear Main Seals 1105-10

DYNO-PAK SBC SILICONE 2pc REAR MAIN SEAL , PK.

Part Number: SCE-1105-10

Not Yet Reviewed

Estimated Ship Date: Mar 2, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 2, 2026 if ordered today

SCE Gaskets Rear Main Seals 1104-10

DYNO PAK SBC SILICONE ALIGN HONE REAR MAIN SEAL , 10.

Part Number: SCE-1104-10

Not Yet Reviewed

Estimated Ship Date: Mar 2, 2026 if ordered today

...Loading

Estimated Ship Date: Mar 2, 2026 if ordered today

Fel-Pro Performance Rear Main Bearing Seals 2900