--- title: "ls rear main seal — Niche Verdict: Skip it (42/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/automotive/ls-rear-main-seal" last_updated: "2026-07-10T00:03:53.900Z" locale: en meta: description: "a small market ($58K/yr) — ls rear main seal doesn't clear our bar today." "og:description": "a small market ($58K/yr) — ls rear main seal doesn't clear our bar today." "og:title": "ls rear main seal — Niche Verdict: Skip it (42/100) | Amazon United States - Flapen" --- Back to Flapen home # **ls rear main seal** **Skip it****42/100 ** a small market ($58K/yr) — ls rear main seal doesn't clear our bar today. **Market/yr** **$58K** **Growth (1y)** **+169.1%** **Products** **18** **Brands** **17** was 14 a year ago **Sellers** **66** **Price range** **$13.71–$69.20** **Returns** **2.9%** **Rating** **4.6★** **Skip it** Scored 42/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **3** ×0.30 Growth **73** ×0.30 Competition **40** ×0.20 Quality gap **33** ×0.10 Returns **77** ×0.10 ## **Demand** Weekly Amazon search volume, last 15 weeks — +169.1% year over year. 595297.5Spike '26Mar '26Apr '26Apr '26May '26May '26Jun '26Jun '26Jul '26 ## **Competition** - Dorman19% - Fel-Pro15% - AUTOBABA13% - Sumyola13% - A-Premium7% - RADHLBNIU6% - Other (11 brands)28% The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them. 17 brands and 66 sellers compete here. **Brands** **17 **▲rising was 14 a year ago **Sellers** **66** **Top 5 brand share** **67%** #ProductBrandPriceRatingReviewsClick shareTrend 1 ![Dorman 635-518 Engine Rear Main Seal Cover Compatible with Select Models](https://m.media-amazon.com/images/I/31Mg5T9z6XL.jpg) [**Dorman 635-518 Engine Rear Main Seal Cover Compatible with Select Models**](https://www.amazon.com/dp/B009ZBSBMO) Dorman$49.634.6★1,16919%▼falling 2 ![FEL-PRO BS 40640 Engine Crankshaft Seal Kit for Chevrolet Silverado 1500](https://m.media-amazon.com/images/I/3195Eqfl2WL.jpg) [**FEL-PRO BS 40640 Engine Crankshaft Seal Kit for Chevrolet Silverado 1500**](https://www.amazon.com/dp/B000C2GA1Y) Fel-Pro$21.594.8★2,11215%▼falling 3 ![Engine Rear Main Seal Cover Kit with Gasket & Bolt Compatible with Cadillac Escalade GMC Yukon Sierra Chevy Suburban Silverado Tahoe Express 4.8 5.3 6.0 6.2L Replace# 635-518 12633579 12639250](https://m.media-amazon.com/images/I/413Pzg157lL.jpg) [**Engine Rear Main Seal Cover Kit with Gasket & Bolt Compatible with Cadillac Escalade GMC Yukon Sierra Chevy Suburban Silverado Tahoe Express 4.8 5.3 6.0 6.2L Replace# 635-518 12633579 12639250**](https://www.amazon.com/dp/B0CZLBB9GP) AUTOBABA$36.044.6★12313%▲rising 4 ![Sumyola Rear Main Seal Gasket Cover & Bolts GM Chevy LS Engine 635-518 12633579 12639250](https://m.media-amazon.com/images/I/31hg-tD3UUL.jpg) [**Sumyola Rear Main Seal Gasket Cover & Bolts GM Chevy LS Engine 635-518 12633579 12639250**](https://www.amazon.com/dp/B0D5B5L929) Sumyola$28.024.3★389%▲rising 5 ![A-Premium Engine Rear Main Seal Cover Kit [OHV 8Cyl 4.8 5.3 5.7 6.0 6.2 7.0L] Compatible with Chevy GMC Cadillac Hummer Isuzu Pontiac Saab & Buick fits Express Silverado Sierra & More Models](https://m.media-amazon.com/images/I/41gRkRB2CrL.jpg) [**A-Premium Engine Rear Main Seal Cover Kit \[OHV 8Cyl 4.8 5.3 5.7 6.0 6.2 7.0L\] Compatible with Chevy GMC Cadillac Hummer Isuzu Pontiac Saab & Buick fits Express Silverado Sierra & More Models**](https://www.amazon.com/dp/B082X9HMHG) A-Premium$36.374.1★3497%▲rising 6 ![RADHLBNIU Rear Main Seal Kit Compatible with Chevy Tahoe Suburban Silverado Express Avalanche Cadillac Escalade GMC Yukon Sierra Savana 4.8L 5.3L 6.0L 6.2L Replaces# 635-518 12633579 12639250](https://m.media-amazon.com/images/I/412uqUL0UqL.jpg) [**RADHLBNIU Rear Main Seal Kit Compatible with Chevy Tahoe Suburban Silverado Express Avalanche Cadillac Escalade GMC Yukon Sierra Savana 4.8L 5.3L 6.0L 6.2L Replaces# 635-518 12633579 12639250**](https://www.amazon.com/dp/B0BYLWZTMR) RADHLBNIU$36.394.6★926%▼falling 7 ![LS Rear Main Seal Cover & Gasket Bolts For 1997-2013 LS Based 4.8 5.3 5.7 6.0 6.2L V8 Engines LS1 LQ4 LQ9 LM7 LS2 LS3 LS7 LC9 LS6 Replace# 12639250 12633579 635-518](https://m.media-amazon.com/images/I/41V+kDQYGgL.jpg) [**LS Rear Main Seal Cover & Gasket Bolts For 1997-2013 LS Based 4.8 5.3 5.7 6.0 6.2L V8 Engines LS1 LQ4 LQ9 LM7 LS2 LS3 LS7 LC9 LS6 Replace# 12639250 12633579 635-518**](https://www.amazon.com/dp/B0F3WPZL3L) Armker$38.234.4★455%▼falling 8 ![BS40640 Rear Main Seal Kit for Chevy Silverado 1500 1997-2016 GM LS Engines 4.8L 5.3L 5.7L 6.0L 6.2L - Replacement Crankshaft Seal & Metal Gasket Set Fits Tahoe Suburban](https://m.media-amazon.com/images/I/41n9GlWwYGL.jpg) [**BS40640 Rear Main Seal Kit for Chevy Silverado 1500 1997-2016 GM LS Engines 4.8L 5.3L 5.7L 6.0L 6.2L - Replacement Crankshaft Seal & Metal Gasket Set Fits Tahoe Suburban**](https://www.amazon.com/dp/B0F6LCKB8K) JBROPARTS$13.744.4★334%▲rising 9 ![GM Genuine Parts 89060436 Crankshaft Rear Main Seal](https://m.media-amazon.com/images/I/31ZemC3N5-L.jpg) [**GM Genuine Parts 89060436 Crankshaft Rear Main Seal**](https://www.amazon.com/dp/B07FZFVXL6) GM GENUINE PARTS$27.164.7★1834%▼falling 10 ![Sumyola Engine Rear Main Seal Cover Kit with Gasket & Bolt for Cadillac Escalade for GMC Yukon Sierra for Chevy Suburban Silverado Tahoe Express 4.8 5.3 6.0 6.2L Replace# 635-518 12633579 12639250](https://m.media-amazon.com/images/I/41A4Nsm7k0L.jpg) [**Sumyola Engine Rear Main Seal Cover Kit with Gasket & Bolt for Cadillac Escalade for GMC Yukon Sierra for Chevy Suburban Silverado Tahoe Express 4.8 5.3 6.0 6.2L Replace# 635-518 12633579 12639250**](https://www.amazon.com/dp/B0FMJYZHPS) Sumyola$26.074.9★154%▲rising 11 ![LOBIUTIYA 635-518 Rear Main Seal Kit with Oil Pan Gasket 12612350 Oil Pan Gaskets for Chevy Silverado Suburban Tahoe Trailblazer GMC Sierra Yukon 4.8L 5.3L 6.0L 6.2L 12637683](https://m.media-amazon.com/images/I/41XMpM5OOeL.jpg) [**LOBIUTIYA 635-518 Rear Main Seal Kit with Oil Pan Gasket 12612350 Oil Pan Gaskets for Chevy Silverado Suburban Tahoe Trailblazer GMC Sierra Yukon 4.8L 5.3L 6.0L 6.2L 12637683**](https://www.amazon.com/dp/B0FVSH428Y) LOBIUTIYA$69.204.6★163%▲rising 12 ![ORAEVY BS 40640 Rear Main Seal Gasket Set- Compatible with GM LS LS1 LS6 LS2 LS3 LQ9 LQ4 4.8L 5.3L 5.7L 6.0L 6.2L Chevy Silverado Suburban Tahoe Trailblazer GMC Sierra](https://m.media-amazon.com/images/I/4100O-1vTES.jpg) [**ORAEVY BS 40640 Rear Main Seal Gasket Set- Compatible with GM LS LS1 LS6 LS2 LS3 LQ9 LQ4 4.8L 5.3L 5.7L 6.0L 6.2L Chevy Silverado Suburban Tahoe Trailblazer GMC Sierra**](https://www.amazon.com/dp/B08ZCDW278) ORAEVY$16.244.3★1772%▼falling 13 ![KAFKOF Rear Main Seal Gasket Kit Compatible with 4.8L 5.3L 5.7L 6.0L 6.2L Chevy Silverado Tahoe Suburban GMC Sierra Yukon Savana Cadillac Escalade. Engine Crankshaft Seal Kit Replace BS40640 12639249](https://m.media-amazon.com/images/I/31ALgoVfMpL.jpg) [**KAFKOF Rear Main Seal Gasket Kit Compatible with 4.8L 5.3L 5.7L 6.0L 6.2L Chevy Silverado Tahoe Suburban GMC Sierra Yukon Savana Cadillac Escalade. Engine Crankshaft Seal Kit Replace BS40640 12639249**](https://www.amazon.com/dp/B0GCF5Y5Y5) kafkof$14.384.9★132%▲rising 14 ![LABLT 635-518 Rear Main Seal Kit 4.8 5.3 6.0 6.2 Replacement for 12633579 12639250](https://m.media-amazon.com/images/I/41KdmyowF4L.jpg) [**LABLT 635-518 Rear Main Seal Kit 4.8 5.3 6.0 6.2 Replacement for 12633579 12639250**](https://www.amazon.com/dp/B09MSWJ52Q) LABLT$25.294.2★162%▲rising 15 ![Moker LS Rear Main Seal Alignment Tool Front Cover Alignment Tools & Oil Pan Front Cover Alignment Tool Kit for GM LS Engine 4.8 5.3 5.7 6.0 LS1 LS2 LS3 LS6 L99 LS4 LS9 LSA LQ4 LQ9 L76 L92](https://m.media-amazon.com/images/I/41QVTLPgzYL.jpg) [**Moker LS Rear Main Seal Alignment Tool Front Cover Alignment Tools & Oil Pan Front Cover Alignment Tool Kit for GM LS Engine 4.8 5.3 5.7 6.0 LS1 LS2 LS3 LS6 L99 LS4 LS9 LSA LQ4 LQ9 L76 L92**](https://www.amazon.com/dp/B08X4QL2TV) Moker$25.604.6★3512%▼falling **~~Showing 15 of 18 — show all ~~** ## **Product shelf** All 18 tracked products in this niche. Top sellersNewestTrending [![Dorman 635-518 Engine Rear Main Seal Cover Compatible with Select Models](https://m.media-amazon.com/images/I/31Mg5T9z6XL.jpg)**Dorman 635-518 Engine Rear Main Seal Cover Compatible with Select Models** Dorman**$49.63**4.6★1,169 reviews](https://www.amazon.com/dp/B009ZBSBMO) [![FEL-PRO BS 40640 Engine Crankshaft Seal Kit for Chevrolet Silverado 1500](https://m.media-amazon.com/images/I/3195Eqfl2WL.jpg)**FEL-PRO BS 40640 Engine Crankshaft Seal Kit for Chevrolet Silverado 1500** Fel-Pro**$21.59**4.8★2,112 reviews](https://www.amazon.com/dp/B000C2GA1Y) [![Engine Rear Main Seal Cover Kit with Gasket & Bolt Compatible with Cadillac Escalade GMC Yukon Sierra Chevy Suburban Silverado Tahoe Express 4.8 5.3 6.0 6.2L Replace# 635-518 12633579 12639250](https://m.media-amazon.com/images/I/413Pzg157lL.jpg)**Engine Rear Main Seal Cover Kit with Gasket & Bolt Compatible with Cadillac Escalade GMC Yukon Sierra Chevy Suburban Silverado Tahoe Express 4.8 5.3 6.0 6.2L Replace# 635-518 12633579 12639250** AUTOBABA**$36.04**4.6★123 reviews](https://www.amazon.com/dp/B0CZLBB9GP) [![Sumyola Rear Main Seal Gasket Cover & Bolts GM Chevy LS Engine 635-518 12633579 12639250](https://m.media-amazon.com/images/I/31hg-tD3UUL.jpg)**Sumyola Rear Main Seal Gasket Cover & Bolts GM Chevy LS Engine 635-518 12633579 12639250** Sumyola**$28.02**4.3★38 reviews](https://www.amazon.com/dp/B0D5B5L929) [![A-Premium Engine Rear Main Seal Cover Kit [OHV 8Cyl 4.8 5.3 5.7 6.0 6.2 7.0L] Compatible with Chevy GMC Cadillac Hummer Isuzu Pontiac Saab & Buick fits Express Silverado Sierra & More Models](https://m.media-amazon.com/images/I/41gRkRB2CrL.jpg)**A-Premium Engine Rear Main Seal Cover Kit \[OHV 8Cyl 4.8 5.3 5.7 6.0 6.2 7.0L\] Compatible with Chevy GMC Cadillac Hummer Isuzu Pontiac Saab & Buick fits Express Silverado Sierra & More Models** A-Premium**$36.37**4.1★349 reviews](https://www.amazon.com/dp/B082X9HMHG) [![RADHLBNIU Rear Main Seal Kit Compatible with Chevy Tahoe Suburban Silverado Express Avalanche Cadillac Escalade GMC Yukon Sierra Savana 4.8L 5.3L 6.0L 6.2L Replaces# 635-518 12633579 12639250](https://m.media-amazon.com/images/I/412uqUL0UqL.jpg)**RADHLBNIU Rear Main Seal Kit Compatible with Chevy Tahoe Suburban Silverado Express Avalanche Cadillac Escalade GMC Yukon Sierra Savana 4.8L 5.3L 6.0L 6.2L Replaces# 635-518 12633579 12639250** RADHLBNIU**$36.39**4.6★92 reviews](https://www.amazon.com/dp/B0BYLWZTMR) [![LS Rear Main Seal Cover & Gasket Bolts For 1997-2013 LS Based 4.8 5.3 5.7 6.0 6.2L V8 Engines LS1 LQ4 LQ9 LM7 LS2 LS3 LS7 LC9 LS6 Replace# 12639250 12633579 635-518](https://m.media-amazon.com/images/I/41V+kDQYGgL.jpg)**LS Rear Main Seal Cover & Gasket Bolts For 1997-2013 LS Based 4.8 5.3 5.7 6.0 6.2L V8 Engines LS1 LQ4 LQ9 LM7 LS2 LS3 LS7 LC9 LS6 Replace# 12639250 12633579 635-518** Armker**$38.23**4.4★45 reviews](https://www.amazon.com/dp/B0F3WPZL3L) [![BS40640 Rear Main Seal Kit for Chevy Silverado 1500 1997-2016 GM LS Engines 4.8L 5.3L 5.7L 6.0L 6.2L - Replacement Crankshaft Seal & Metal Gasket Set Fits Tahoe Suburban](https://m.media-amazon.com/images/I/41n9GlWwYGL.jpg)**BS40640 Rear Main Seal Kit for Chevy Silverado 1500 1997-2016 GM LS Engines 4.8L 5.3L 5.7L 6.0L 6.2L - Replacement Crankshaft Seal & Metal Gasket Set Fits Tahoe Suburban** JBROPARTS**$13.74**4.4★33 reviews](https://www.amazon.com/dp/B0F6LCKB8K) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Quality-Overall**28% *“The bolts look like very good quality”* **Size-Overall**24% *“Fit great”* **Leak-Proof**12% *“No more leaking rear main seal”* **Advertised Vs Actual Product**10% *“It does was supposed to do”* **Assembly/Installation**6% *“Easy install”* **Value For Money**6% *“the price is fair”* **Efficiency**3% *“Works great”* **Maintenance And Repair**1% *“GM V8 engines can last a very long time with proper maintenance”* **Safety Standards**1% *“Seals the rear main as it should”* **Fuel Efficiency**1% *“it plays a big role in keeping a 5.3L Chevy motor clean and healthy”* ### **What buyers complain about ** **Leak-Proof**38% *“Leaks”* **Durability**10% *“Lasted 6 months and blew out”* **Quality-Overall**9% *“Junk”* **Assembly/Installation**8% *“I havent installed it yet”* **Compatibility-Overall**5% *“engineering does not fit the Eco tech 5.3 L”* **Defective Material/Parts**5% *“Received unusable part”* **Size-Overall**3% *“only complaint was the supplied bolts are larger than factory”* **Thickness**3% *“This is actually thicker than the factory cover”* **Maintenance And Repair**1% *“I replaced it before setting the engine in the new frame to save myself the headache of having to replace it later”* **Lubrication**1% *“I lost oil pressure late January 2026”* #### **Top return reasons**- Size-Overall22% - Leak-Proof14% - Defective Material/Parts12% - Value For Money9% - Compatibility-Overall8% - Product Condition6% - Quality-Overall6% - Advertised Vs Actual Product5% - Functionality-Overall3% - Assembly/Installation3%