Provided that you’re swapping or rebuilding an LS-series V8, pick an OE-spec kit that matches your engine code and crank flange, like the GM LS Oil Pan & Rear Main Seal Kit, BS 40640, ICT Billet, YIDEZU or FEL‑PRO options; verify inclusion of the rear cover gasket, crank seal and dowels. Choose fluoroelastomer seals for heat resistance and confirm fitment for 4.8–6.2L engines. Keep wrench, seal driver and solvents ready, and proceed to the full list to get exact part numbers and fitment tips.
| GM LS V8 Oil Pan & Rear Main Seal Gasket Kit |
| Best Overall | Compatibility (Engine families / displacements): GM LS V8 engines — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L | Function / Purpose: Seals oil at oil pan and rear crankshaft (oil pan gasket + rear main seal) | Includes Rear Main Seal: Yes — rear main seal kit included | VIEW LATEST PRICE | Read Our Analysis |
| BS 40640 Rear Main Seal Gasket Set for GM LS |
| Best Value | Compatibility (Engine families / displacements): GM Vortec / LS — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L | Function / Purpose: Rear crankshaft main seal gasket set (prevent oil leaks) | Includes Rear Main Seal: Yes — rear main seal gasket set included | VIEW LATEST PRICE | Read Our Analysis |
| ICT Billet LS Rear Main Seal O-ring Gasket |
| Premium Upgrade | Compatibility (Engine families / displacements): GM LS series Gen 3 & 4 — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L | Function / Purpose: Rear crankshaft cover gasket and rear main seal (prevent oil leaks) | Includes Rear Main Seal: Yes — crankshaft rear seal included | VIEW LATEST PRICE | Read Our Analysis |
| Oil Pan Gasket & Rear Main Seal Set for GM V8 |
| Budget-Friendly Pick | Compatibility (Engine families / displacements): GM V8 / LS family — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L | Function / Purpose: Oil pan gasket + rear main seal set (seal oil, prevent leaks) | Includes Rear Main Seal: Yes — rear main seal included | VIEW LATEST PRICE | Read Our Analysis |
| FEL-PRO BS 40592 Rear Main Seal Set |
| Trusted OEM Alternative | Compatibility (Engine families / displacements): (Different brand, still engine seal application) — Ford-era list (note: product is rear main seal kit for older Ford engines) | Function / Purpose: Rear main crankshaft seal kit (seal crankshaft, prevent oil leaks) | Includes Rear Main Seal: Yes — rear main seal set included | VIEW LATEST PRICE | Read Our Analysis |
| Rear Main Seal Gasket Set for GM LS Engines |
| Reliable Replacement | Compatibility (Engine families / displacements): GM LS family — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L | Function / Purpose: Rear main gasket seal (prevent oil leaks at rear crank) | Includes Rear Main Seal: Yes — rear main gasket seal included | VIEW LATEST PRICE | Read Our Analysis |
| LS V8 Oil Pan Gasket & Rear Main Seal Kit |
| Complete Kit | Compatibility (Engine families / displacements): GM LS V8 engines — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L | Function / Purpose: Oil pan gasket set + rear main seal (seal oil pan and rear crank) | Includes Rear Main Seal: Yes — LS rear main seal kit included | VIEW LATEST PRICE | Read Our Analysis |
| Donepart Rear Main Seal Kit with Crankshaft Seal |
| Heavy-Duty Choice | Compatibility (Engine families / displacements): GM-compatible LS engines — 4.8L, 5.3L, 5.7L, 6.0L | Function / Purpose: Rear main seal, cover gasket, crankshaft seal (prevent oil leaks) | Includes Rear Main Seal: Yes — rear main seal included | VIEW LATEST PRICE | Read Our Analysis |
| Rear Main Seal Kit for Chevy Silverado & GM LS |
| Wide Fitment Pick | Compatibility (Engine families / displacements): GM LS-series engines — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L (some listings include select 7.0L) | Function / Purpose: Rear main crankshaft seal and metal gasket set (prevent oil leaks) | Includes Rear Main Seal: Yes — rear main/crankshaft seal included | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
GM LS V8 Oil Pan & Rear Main Seal Gasket Kit
Should you’re working on a GM LS-series V8—4.8L through 6.2L—this oil pan and rear main seal kit is a smart choice because it bundles the exact gaskets and crankshaft seal (OS32241/OS30693R and BS 40640/89060436) you’ll need for a correct, OE-spec fit across Chevy, GMC, Cadillac and related models from 1999–2020; verify your vehicle year, engine code (LS1, LS2, LS3, LS6, LM7, LQ4, LQ9) and trim before ordering to guarantee compatibility. You get an oil pan gasket set and rear main seal kit with cross-references (12612350, 12639249, 89060436) built to OE specs for durability. Check fitment, contact support with questions, and expect reliable service life.
- Compatibility (Engine families / displacements):GM LS V8 engines — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L
- Function / Purpose:Seals oil at oil pan and rear crankshaft (oil pan gasket + rear main seal)
- Includes Rear Main Seal:Yes — rear main seal kit included
- OEM / OE Interchange Numbers Provided:OS32241, OS30693R, 12612350, BS 40640, 12639249, 89060436
- Material / Durability Claims:High-quality, durable materials meeting OE specs
- Seller / Manufacturer Support (warranty / after-sale support):Seller encourages pre-purchase research; contact support for fitment/questions
- Additional Feature:Includes oil pan gasket
- Additional Feature:Covers wide model years
- Additional Feature:Replaces multiple part numbers
BS 40640 Rear Main Seal Gasket Set for GM LS
Should you’re rebuilding or repairing GM LS Vortec engines from 1999–2020, the BS 40640 Rear Main Seal Gasket Set is your best choice because it directly replaces OE numbers 89060436 and 12639249 and’s built to withstand the high pressures and temperatures those engines see. You get a durable rear main gasket engineered for 4.8L–6.2L Vortec families, fitting Chevrolet, GMC, Cadillac, Buick models listed. It meets or exceeds equipment specs, resists breakage and aggressive fluids, and serves as both a seal and force-transmission component. The kit includes the seal, installation gloves, a cleaning brush, and a 12-month warranty plus email support.
- Compatibility (Engine families / displacements):GM Vortec / LS — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L
- Function / Purpose:Rear crankshaft main seal gasket set (prevent oil leaks)
- Includes Rear Main Seal:Yes — rear main seal gasket set included
- OEM / OE Interchange Numbers Provided:Replacement for 89060436, 12639249; listed as BS 40640
- Material / Durability Claims:Durable, less prone to breakage; withstands high pressure/temperature
- Seller / Manufacturer Support (warranty / after-sale support):12-month warranty; after-sale support via email; satisfaction commitment
- Additional Feature:Includes installation gloves
- Additional Feature:Cleaning brush included
- Additional Feature:12-month warranty
ICT Billet LS Rear Main Seal O-ring Gasket
Should you be swapping or rebuilding a Gen 3/Gen 4 GM LS engine, the ICT Billet LS Rear Main Seal O‑ring Gasket stands out for its direct OEM-fit design and included crankshaft seal—so you can drop it in without fabricating or modifying the rear cover. You’ll get a rear cover gasket and a crankshaft seal compatible with 4.8, 5.3, 5.7, 6.0, and 6.2L LS engines (LS1, LQ4, LQ9, LM7, LS2, LS3, LS7, LC9, LS6). It replaces worn OEM parts to stop rear main oil leaks. Verify your engine and avoid LSX blocks and LSX rear covers.
- Compatibility (Engine families / displacements):GM LS series Gen 3 & 4 — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L
- Function / Purpose:Rear crankshaft cover gasket and rear main seal (prevent oil leaks)
- Includes Rear Main Seal:Yes — crankshaft rear seal included
- OEM / OE Interchange Numbers Provided:Direct replacement for OEM rear cover gasket and crank seal (references OEM fit)
- Material / Durability Claims:Billet-design O-ring / gasket intended as direct OEM replacement (durable)
- Seller / Manufacturer Support (warranty / after-sale support):Advises verification of engine model; supplier support implied for fitment
- Additional Feature:Billet rear cover design
- Additional Feature:Includes O-ring type gasket
- Additional Feature:Not for LSX blocks
Oil Pan Gasket & Rear Main Seal Set for GM V8
In case you’re rebuilding or maintaining a GM V8—like a Silverado, Camaro, or Escalade—this Oil Pan Gasket with Rear Main Seal Set is a practical choice because it bundles the rear main seal, oil pan gasket, and timing cover gasket in one kit, saving you time sourcing matching parts. You’ll get a YIDEZU SET1 kit (ASIN B0CYLN1VL1) that fits 4.8L–6.2L V8s and LS-family engines (LS1, LS2, LS3, LS6, LM7, LQ4, LQ9). The kit includes the seal and gaskets, uses quality materials for reliable sealing, and carries a one-year warranty; returns follow Amazon’s 30-day policy.
- Compatibility (Engine families / displacements):GM V8 / LS family — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L
- Function / Purpose:Oil pan gasket + rear main seal set (seal oil, prevent leaks)
- Includes Rear Main Seal:Yes — rear main seal included
- OEM / OE Interchange Numbers Provided:BS40640, OS30693R, 12612350, 89060436, 12639249, OS32241
- Material / Durability Claims:High quality materials; good sealing performance
- Seller / Manufacturer Support (warranty / after-sale support):1-year warranty; Amazon 30-day return; seller support available
- Additional Feature:Includes timing cover gasket
- Additional Feature:YIDEZU branded kit
- Additional Feature:Amazon 30-day return
FEL-PRO BS 40592 Rear Main Seal Set
Looking for a rear main seal set that’s built to match factory specs for older Ford trucks and cars? You’ll like the FEL-PRO BS 40592 Rear Main Seal Set. Fel-Pro designed BS40592 to meet or exceed OEM specs for 1987–1997 Ford applications—F-250 HD, Crown Victoria, Bronco, Econoline and more—so it fits engine crankshaft rear seal jobs upon you enter full vehicle details. It uses application-specific gasket materials for a 100% seal claim, targets professional durability, and accepts engine oil. Take into account: it’s discontinued from the manufacturer, carries FDA spec mentions, and weighs virtually nothing—check seller notes prior to ordering.
- Compatibility (Engine families / displacements):(Different brand, still engine seal application) — Ford-era list (note: product is rear main seal kit for older Ford engines)
- Function / Purpose:Rear main crankshaft seal kit (seal crankshaft, prevent oil leaks)
- Includes Rear Main Seal:Yes — rear main seal set included
- OEM / OE Interchange Numbers Provided:OEM/bearing number 40592; many OEM identifiers listed (Fel-Pro part)
- Material / Durability Claims:Made for professional use; meets/exceeds OE; material noted for sealing performance
- Seller / Manufacturer Support (warranty / after-sale support):Manufacturer warranty/return info available; Fel-Pro support references
- Additional Feature:Fel-Pro brand legacy
- Additional Feature:FDA specification noted
- Additional Feature:Discontinued by manufacturer
Rear Main Seal Gasket Set for GM LS Engines
Should you own a GM LS-series engine and need a dependable rear main gasket, the BS40640 Rear Main Seal Gasket Set is a top pick because it’s made to fit LS, LS1, LS6, LS2, LS3, LQ9 and LQ4 engines (4.8L–6.2L) used in Silverado, Suburban, Tahoe, Trailblazer and Sierra models. You get one rear main gasket seal that replaces BS40640 and 12639249, engineered to resist high pressure, temperature, and aggressive automotive fluids. It’s built for durability and low breakage, serving both sealing and force-transmission roles around the cylinder head. Customer support is available should issues arise.
- Compatibility (Engine families / displacements):GM LS family — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L
- Function / Purpose:Rear main gasket seal (prevent oil leaks at rear crank)
- Includes Rear Main Seal:Yes — rear main gasket seal included
- OEM / OE Interchange Numbers Provided:Replaces BS40640, 12639249
- Material / Durability Claims:Designed for reliability; resists breakage; handles high pressure/temperature
- Seller / Manufacturer Support (warranty / after-sale support):Customer support available for product issues; seller assistance offered
- Additional Feature:Compact single-seal package
- Additional Feature:Specifically lists LQ9 fitment
- Additional Feature:Simplified part replacement
LS V8 Oil Pan Gasket & Rear Main Seal Kit
In case you own a GM vehicle with an LS V8 and need a complete, OEM-spec repair, this LS V8 Oil Pan Gasket & Rear Main Seal Kit is built for you — it bundles the oil pan gasket set, rear main seal kit, rear seal cover gasket, and crankshaft seal so you can swap everything at once and get back on the road with confidence. You’ll get OS30693R, BS40640, 12639249, and 89060436, replacing older OS32241/OS30693R/12612350. It fits 4.8–6.2L LS engines (LS1/LS2/LS3/LS6/LM7/LQ4/LQ9) across many GM models 1999–2020. Confirm year/make/model/engine before buying. Seller support prioritizes satisfaction.
- Compatibility (Engine families / displacements):GM LS V8 engines — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L
- Function / Purpose:Oil pan gasket set + rear main seal (seal oil pan and rear crank)
- Includes Rear Main Seal:Yes — LS rear main seal kit included
- OEM / OE Interchange Numbers Provided:Replaces OS32241, OS30693R, 12612350; includes 12639249, 89060436
- Material / Durability Claims:Built to meet OEM specifications; durable for long service life
- Seller / Manufacturer Support (warranty / after-sale support):Seller prioritizes satisfaction; contact for fast resolution
- Additional Feature:Combined comprehensive kit
- Additional Feature:Replaces OS32241/12612350
- Additional Feature:Broad vehicle make list
Donepart Rear Main Seal Kit with Crankshaft Seal
Should you need a reliable, OEM-spec replacement for GM and related V8 engines, the Donepart Rear Main Seal Kit BS40640 is a great pick — it’s built to hold up under constant vibration and extreme temperature swings while sealing the crankshaft and cover interface. You get the rear main seal, cover gasket, and crankshaft seal engineered from premium materials for shape retention and resilience. It fits Cadillac, Buick, GMC, Hummer, Isuzu, Pontiac, and Saab V8s (4.8L, 5.3L, 5.7L, 6.0L) and meets OEM specs for tight sealing and extended service life. Verify fitment and contact the seller should unsure.
- Compatibility (Engine families / displacements):GM-compatible LS engines — 4.8L, 5.3L, 5.7L, 6.0L
- Function / Purpose:Rear main seal, cover gasket, crankshaft seal (prevent oil leaks)
- Includes Rear Main Seal:Yes — rear main seal included
- OEM / OE Interchange Numbers Provided:Part interchange BS40640 (includes related part numbers)
- Material / Durability Claims:Premium materials engineered for shape retention/resilience
- Seller / Manufacturer Support (warranty / after-sale support):Support recommended for fitment questions; seller contact available
- Additional Feature:Includes crankshaft seal
- Additional Feature:Vibration-resistant design
- Additional Feature:Premium materials claimed
Rear Main Seal Kit for Chevy Silverado & GM LS
Should you’re rebuilding or repairing a Chevy Silverado or any GM vehicle with an LS-series V8, the BS40640 rear main seal kit gives a direct-fit crankshaft seal and metal gasket set that saves you time and hassle. You’ll get a JBROPARTS STORE kit (JBR-BS40640) that replaces many OE numbers and fits 4.8L–6.2L (select 7.0L) engines across Chevy, GMC, Cadillac, Buick, Pontiac, Hummer and more. It suits Silverado, Tahoe, Suburban, Sierra, Corvette and others from late 1990s–2016 depending on model. The kit is lightweight, ships in slim packaging, and carries seller warranty and return options.
- Compatibility (Engine families / displacements):GM LS-series engines — 4.8L, 5.3L, 5.7L, 6.0L, 6.2L (some listings include select 7.0L)
- Function / Purpose:Rear main crankshaft seal and metal gasket set (prevent oil leaks)
- Includes Rear Main Seal:Yes — rear main/crankshaft seal included
- OEM / OE Interchange Numbers Provided:Lists many OE/OEM numbers including BS40640, 8890604360, 89060436 and others
- Material / Durability Claims:Replacement metal gasket and seal engineered for sealing performance (seller claims OEM compatibility)
- Seller / Manufacturer Support (warranty / after-sale support):Warranty/return policy referenced; contact seller for warranty details
- Additional Feature:Extensive OE number list
- Additional Feature:Wide model-year coverage
- Additional Feature:Large packaging dimensions
Factors to Consider When Choosing Rear Main Gasket Sets
At the time of choosing a rear main gasket set, you should prioritize fitment and compatibility with your engine, plus the material quality for long-term durability. Check the seal design and type along with temperature and pressure ratings to make certain it handles your operating conditions. Also consider how easy it is to install and whether you’ll need special tools.
Fitment And Compatibility
Before you buy, double-check that the gasket set explicitly lists compatibility with your engine family and displacement, since rear main covers, seal bores, and crank flange diameters can vary across engine code and model year. Match the set’s part numbers or OEM interchange references to your service manual or a VIN-derived parts lookup so the cover gasket and crank seal have correct shapes and hole locations. Verify the kit contains all required pieces for your application—rear cover gasket, crankshaft seal, and any O-rings or alignment dowels—to avoid partial-fit surprises. Check the rear cover design and crank flange diameter for compatibility with the replacement seal type. Should you’ve got swapped, modified, or updated blocks, cross-reference build changes before purchasing.
Material Quality And Durability
After confirming fitment and compatibility, turn your attention to material quality and durability, since the best-looking gasket won’t last provided it’s made from the wrong compound or construction. You should choose heat-resistant elastomers like Viton or high-temp nitrile, or multi-layer steel, to handle continuous 200–300°F under-hood temps and occasional spikes above 400°F. Prefer compounds with proven oil and solvent resistance and low permeability so they won’t harden, swell, or degrade from oil, vapors, and additives over thousands of miles. Look for reinforced sealing lips, back-up rings, or multi-layer constructions that resist extrusion and hold sealing pressure under crankcase loads. Check dimensional stability and compression-set resistance; materials that recover thickness and resist abrasion on variable crankshaft interfaces last longer and cut leak recurrence.
Seal Design And Type
Although seal choice could seem minor, picking the right design and material directly determines how well the rear main prevents leaks and copes with shaft movement and heat. You’ll favor single-piece rubber/metal seals for better concentricity and leak resistance, though split or flanged two-piece designs ease installation. Choose lip material based on service: nitrile for general use, Viton/FKM for higher temp and aggressive fluids, silicone where flexibility matters. Decide between hydrodynamic spring-loaded garter seals and non-spring types—spring-loaded garters handle shaft runout and wear better. Match O-ring and cover gasket cross-sections and compression tolerances to avoid blowout under crankcase pressure. Finally, confirm shaft diameter tolerance and inner-diameter interference—typically 0.010″–0.030″—to balance sealing and wear.
Temperature And Pressure Resistance
At the moment you pick a rear main gasket, prioritize materials and designs that keep sealing performance under sustained oil temps of 200–300°F and brief spikes above 300°F while resisting crankcase pressure and variable loads; choose compounds (fluoroelastomer, nitrile, silicone) rated for low compression set and minimal heat-aging changes so the seal won’t harden, crack, or lose elasticity across 100–200°F thermal swings. You should check heat-aging specs—look for minimal tensile loss and less than ~20% hardness increase after 100–200 hours at elevated test temps. Expect peak local pressures above 60–80 psi in heavy blow-by or boosted engines, so prioritize compression-set resistance. Fluoroelastomers usually offer the best heat and oil resistance; nitrile and silicone work in less extreme conditions. Verify elasticity accommodates thermal expansion between crank and housing.
Installation Ease And Tools
Good material selection and tolerance for heat and pressure only get you so far provided the gasket and seal aren’t installed correctly, so you’ll want to assess installation ease and tool needs before you buy. Verify required tools up front — torque wrench, seal driver or correct socket, gasket scraper, RTV provided specified, plus an engine hoist or transmission jack for heavy removals. Check workspace accessibility and lighting; limited access often means lifting the engine or dropping the transmission, which adds labor. Clean mating surfaces with a non‑abrasive solvent and inspect for burrs, warpage, or corrosion. Use the proper seal driver and press the seal evenly to the specified depth. Finally, follow torque sequences and values and allow any recommended cure time to avoid distortion and leaks.
Included Components And Extras
As you inspect a rear main gasket kit, make certain it gives you everything needed to do the job right the initial time. You’ll want both the rear crankshaft seal and the mating cover gasket so you replace all sealing surfaces at once and avoid repeat disassembly. Check whether the gasket is a one‑piece molded cover or multiple pieces to match your cover style and simplify installation.
Look for installation aids—alignment dowels, retaining clips, or an O‑ring—that help seat components correctly and reduce leak risk. Confirm included consumables like gasket sealant, lubricant, cleaning brushes, or gloves so you don’t scramble for supplies. Prefer kits with clear instructions and torque specs to make certain correct assembly and protect the new seal and cover.
Warranty And Support
Anytime you’re choosing a rear main gasket set, warranty and support can save you time and money in case something goes wrong, so check the length and what’s actually covered—material and workmanship, exclusions for wear or improper installation, and whether labor is reimbursed. You should compare term lengths (e.g., 12 months vs. lifetime) to gauge protection for premature failures. Confirm the warranty explicitly covers gasket and seal material and workmanship, not just cosmetic issues, and take into account common exclusions like wear or improper installation. Verify remedies—replacement, repair, or refund—and whether labor reimbursement is offered. Make sure the manufacturer provides accessible support channels with reasonable response times, and read claim procedures and documentation requirements to avoid denied claims.
