---
title: "Ls Rear Main Seal — $58K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/ls-rear-main-seal"
last_updated: "2026-08-10T13:40:42.793Z"
locale: en
meta:
description: "Niche score 47/100 · $58K/yr market · 22K searches/yr · $29.66 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 47/100 · $58K/yr market · 22K searches/yr · $29.66 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Ls Rear Main Seal — $58K/yr Amazon US Niche (2026) - Flapen"
---
# **ls rear main seal**
**Skip it**
A small market ($58K/yr) — this niche doesn't clear our bar today.
Market size 14Growth 18Conversion 83Competition 36Returns 52Price range 93Avg price 95Brand share 64Review moat 87Quality gap 30
**Avg price**
**Incredible****$29.66**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$13.71–$69.20**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Review moat**
**Great****263.33**
avg incumbent reviews — the moat a new listing must climb
**Conversion**
**Great****8.9%**
search→purchase rate — share of searches ending in a sale
**Brand share**
**Good****67%**
top-5 brand share — brands hold most of the demand
**Returns**
**Good****2.9%**
return rate — above 5% kills the launch gate
**Competition**
**Okay****63%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-13.4%**
90-day search growth — must beat 0% to launch
**Market size**
**Bad****$58K**
$58K/yr · 22K searches
**Signals**[** No Dominant Brand**](https://flapen.com/research/niches?market=us&signal=no_dominant_brand "Top brand's click share < 20%")
According to Flapen's Amazon United States niche tracking, ls rear main seal is a $58K/yr Amazon United States market (22K searches/yr). The top 5 brands hold 67% of demand. Verdict: Skip it — 47/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **ls rear main seal market data**
- **Units sold / yr**
- **2K–2K**
- avg 0–100/product
- **Revenue / yr**
- **$44K–$59K**
- units × avg price
- **Conversion rate**
- **8.9%**
- **Avg BSR**
- **#704**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **94%**
- **Out of stock**
- **4.9%**
- **Avg brand age**
- **53 months**
- **Avg seller age**
- **153 days**
## **Competition & brand share**
The top 5 products take 63% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**17 **▲rising
**Sellers**
**66**
**Top-5 brand share**
**67%**
Top 20: 100%
**Top-5 click share**
**63%**
Top 20: 100%
**Open market**
**28%**
- Dorman19% - Fel-Pro15% - AUTOBABA13% - Sumyola13% - A-Premium7% - RADHLBNIU6%
## **Demand**
Weekly Amazon search volume, last 15 weeks — -13.4% search growth over the last 90 days.
500300Spike '26Mar '26Apr '26Apr '26May '26May '26Jun '26Jun '26Jul '26
[**Open Trend **](https://flapen.com/research/us/automotive/ls-rear-main-seal/trend)
## **Top ls rear main seal search terms**
- **ls rear main seal**9K/yr-19.0%10.4% conv. - **rear main seal for 5.3 chevy engine**4K/yr+130.4%4.2% conv. - **5.3 rear main seal**5K/yr-2.6%5.1% conv. - **rear main seal 5.3**3K/yr-89.4%3.9% conv. [**All search terms **](https://flapen.com/research/us/automotive/ls-rear-main-seal/search-terms)
## **Top ls rear main seal products on Amazon**
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
0%5%$3K10%$6K15%$9K20%$12K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 18 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Dorman 635-518 Engine Rear Main Seal Cover Compatible with Select Models**Dorman**$49.63**4.6★1,169 rev](https://www.amazon.com/dp/B009ZBSBMO) [2**FEL-PRO BS 40640 Engine Crankshaft Seal Kit for Chevrolet Silverado 1500**Fel-Pro**$21.59**4.8★2,112 rev](https://www.amazon.com/dp/B000C2GA1Y) [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**AUTOBABA**$36.04**4.6★123 rev](https://www.amazon.com/dp/B0CZLBB9GP) [4**Sumyola Rear Main Seal Gasket Cover & Bolts GM Chevy LS Engine 635-518 12633579 12639250**Sumyola**$28.02**4.3★38 rev](https://www.amazon.com/dp/B0D5B5L929) [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**A-Premium**$36.37**4.1★349 rev](https://www.amazon.com/dp/B082X9HMHG)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**VANLISON Rear Main Seal Cover Kit - Compatible with Chevy Silverado Tahoe Suburban Avalanche GMC Sierra Yukon Savana ESC 4.8L 5.3L 6.0L 6.2L - Replaces 635-518 12633579 12639250**Vanlison**$31.68**1 rev5mo ago](https://www.amazon.com/dp/B0GLXSB52T) [**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**kafkof**$14.38**13 rev6mo ago](https://www.amazon.com/dp/B0GCF5Y5Y5) [**vocsvok BS40640 Rear Main Seal Kit for Hummer Chevy Silverado GMC Buick Cadillac - Fits GM 4.8L 5.3L 5.7L 6.0L LS Engines Replacement Crankshaft Seal Metal Gasket Set**vocsvok**$13.71**6 rev7mo ago](https://www.amazon.com/dp/B0G3FYRQRD) [**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**LOBIUTIYA**$69.20**16 rev9mo ago](https://www.amazon.com/dp/B0FVSH428Y) [**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**Sumyola**$26.07**15 rev10mo ago](https://www.amazon.com/dp/B0FMJYZHPS)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**VANLISON Rear Main Seal Cover Kit - Compatible with Chevy Silverado Tahoe Suburban Avalanche GMC Sierra Yukon Savana ESC 4.8L 5.3L 6.0L 6.2L - Replaces 635-518 12633579 12639250**Vanlison**$31.68**5.0★**▲ 254%**](https://www.amazon.com/dp/B0GLXSB52T) [**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**kafkof**$14.38**4.9★**▲ 183%**](https://www.amazon.com/dp/B0GCF5Y5Y5) [**Michigan Motorsports LS Rear Main Crank Cover Seal | Replaces GM 89060436 | Fits 4.8L 5.3L 5.7L 6.0L 6.2L LS Engines LS1 LS2 LS3 LQ9 LQ4 | Quality Replacement Rear Main Seal for GM LS Applications**Michigan Motorsports**$24.61**5.0★**▲ 143%**](https://www.amazon.com/dp/B08QW4QXST) [**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**Sumyola**$26.07**4.9★**▲ 139%**](https://www.amazon.com/dp/B0FMJYZHPS) [**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**LOBIUTIYA**$69.20**4.6★**▲ 95%**](https://www.amazon.com/dp/B0FVSH428Y)
**~~View all trending →~~**
## **What buyers say about ls rear main seal**
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-Overall**22%
**Leak-Proof**14%
**Defective Material/Parts**12%
**Value For Money**9%
**Compatibility-Overall**8%
**Product Condition**6%
**Quality-Overall**6%
**Advertised Vs Actual Product**5%
**Functionality-Overall**3%
**Assembly/Installation**3%
## **Common questions**
- **Is ls rear main seal profitable to sell on Amazon United States?**
- The niche generates $58K/yr across 18 tracked products. 2 of 5 products launched in the last 360 days are still selling. 90-day search growth is -13.4%. Flapen's verdict: Skip it (47/100).
- **How competitive is the ls rear main seal niche?**
- 17 brands and 66 sellers compete. The top 5 products take 63% of clicks and top 5 brands hold 67% of demand.
- **What do buyers complain about in ls rear main seal?**
- Top complaints mined from reviews: Leak-Proof, Durability, Quality-Overall. The return rate is 2.9%.
- **What does it cost to enter the ls rear main seal niche?**
- Listings span $13.71–$69.20; the average listing price is $29.66 (sweet spot $15–$100). The average incumbent carries 263 reviews — the moat a new listing must climb.
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