Rear Main Seal
MaybeThe average product has only 227 reviews. But demand is soft, at -15.5% this quarter, so Rear Main Seal is a Maybe.
- Flapen Score
- 51 / 100Top 39% of 7,287 Automotive niches · +2 vs the category median of 4951
- Market size
- $200K/yr258K searches / yr
- 90-day growth
- -15.5%search demand this quarter
- Competition
- 36%top-5 click share · 17 brands · 113 sellers
Flapen Score
Rear Main Seal against its category
The dotted line is the Automotive average. Past it, Rear Main Seal is stronger. Inside it, weaker.
Market
The Rear Main Seal market on Amazon at a glance
Shoppers on Amazon United States searched for Rear Main Seal 258K times last year and spent an estimated $200K. The top 5 brands take 82% of clicks. Demand peaks in Mar. Flapen scores it 51 out of 100, a Maybe.
01 · Demand
An estimated 4.0% of those searches ended in a purchase.
Shoppers searched for this 258K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 4.0% of those searches ended in a purchase. Searches in the last 90 days moved -15.5% against the 90 days before. Searches, conversion and average price together put the market at an estimated $200K a year.
- Searches, last 12 months
- 258K
- Growth, 90 days vs prior 90
- -15.5%
- Conversion, latest week
- 4.0%
- Market size, estimated
- $200Ka year
- Peak month
- March1.6× the quietest month
- Top search term
- rear main seal135K searches a year
02 · Price
A sale here is worth $19.46.
Listings sell for $19.46 on average, from $6.68 to $69.20. Amazon reports units sold in ranges. This niche sold 10K to 13K a year. The average listing sells 100 to 250 of them. At $19.46 that is $2K to $5K a year per listing.
- Average price
- $19.46inside the $15 to $100 sweet spot
- Price range
- $6.68–$69.20
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 10K–13K
- Units per listing a year
- 100–250
- Revenue per listing a year
- $2K–$5K
- Returns
- 3.5%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is ads.
95% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.0% of listings are out of stock. The average listing ranks #548 within Bearings & Seals. It carries 227 reviews at 4.51 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 95%
- Prime listings
- 100%
- Out of stock, average day
- 0.0%
- Average rank
- #548in Bearings & Seals
- Average rating
- 4.51 starsAmazon United States average 4.42 stars
- Average reviews
- 227per listing
- Listings tracked
- 58
04 · Newcomers
2 of last year's 2 launches cleared the first-year sales bar.
2 products launched here in the last 12 months. 2 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 59 months on average, so the names here are settling in.
- Launched, last 12 months
- 2
- Successful launches
- 2Amazon's first-year sales bar
- Average brand age
- 59 months
Products
Top Rear Main Seal products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 9, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Dorman 635-518 Engine Rear Main Seal Cover Compatible with Select Models
- Price
- $49.63
- Rating
- 4.6/5
- Reviews
- 1,169
- Age
- 13y ago

FEL-PRO BS 40640 Engine Crankshaft Seal Kit for Chevrolet Silverado 1500
- Price
- $21.59
- Rating
- 4.8/5
- Reviews
- 2,112
- Age
- 19y ago
![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
- Price
- $36.37
- Rating
- 4.1/5
- Reviews
- 349
- Age
- 6y ago

FEL-PRO TCS 46117 Engine Crankshaft Seal Kit for Ford F-150
- Price
- $8.37
- Rating
- 4.7/5
- Reviews
- 495
- Age
- 18y ago

FEL-PRO TCS 46051 Engine Crankshaft Seal Kit for Honda CR-V
- Price
- $8.34
- Rating
- 4.7/5
- Reviews
- 535
- Age
- 18y ago
Trending
estimated 90-day click momentum
National 100470 Engine Crankshaft Seal for Chevrolet Silverado 1500
- Price
- $10.57
- Rating
- 4.9/5
- Reviews
- 67
- Age
- 18y ago

FEL-PRO BS 40619 Rear Main Seal Set
- Price
- $19.68
- Rating
- 4.4/5
- Reviews
- 81
- Age
- 19y ago

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
- Price
- $36.39
- Rating
- 4.6/5
- Reviews
- 92
- Age
- 3y ago

FEL-PRO BS 40666 Rear Main Seal Set
- Price
- $11.16
- Rating
- 4.7/5
- Reviews
- 259
- Age
- 19y ago

GM Genuine Parts 296-02 (12585673) Engine Front Cover Seal
- Price
- $23.61
- Rating
- 4.8/5
- Reviews
- 545
- Age
- 18y ago
Newest
by launch date
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
- Price
- $36.04
- Rating
- 4.6/5
- Reviews
- 123
- Age
- 2y ago

National 711024 Engine Crankshaft Seal
- Price
- $11.34
- Rating
- 4.7/5
- Reviews
- 51
- Age
- 2y ago

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
- Price
- $36.39
- Rating
- 4.6/5
- Reviews
- 92
- Age
- 3y ago
![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
- Price
- $36.37
- Rating
- 4.1/5
- Reviews
- 349
- Age
- 6y ago

GM Genuine Parts 89060436 Crankshaft Rear Main Seal
- Price
- $27.16
- Rating
- 4.7/5
- Reviews
- 183
- Age
- 7y ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 36% of clicks, no more. An open shelf where new products get seen.
Brands
17 rising
Sellers
113
Est. top-5 brand share
82%
Top 20: 100%
Est. top-5 click share
36%
Top 20: 66%
Open market
12%
- Fel-Pro47%
- Dorman14%
- ACDelco9%
- National6%
- A-Premium6%
- GM GENUINE PARTS6%
- Open — no brand owns it (11 brands, 12%)
Demand
Rear Main Seal search demand
Weekly searches over the year, seasonality beneath. Pick a range.
Peak months: Mar · busiest ÷ quietest = 1.6×
Search terms
Top Rear Main Seal search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- rear main seal135K/yr
- crankshaft seal49K/yr
- front crankshaft seal19K/yr
- front main seal16K/yr
- rear main seal kit19K/yr
- crank seal10K/yr
- crank shaft seal5K/yr
- rear crankshaft seal5K/yr
Reviews and returns
What reviews say buyers love and hate about Rear Main Seal
We read the reviews and the return reasons for every product selling here.
“Leaking”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
17 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Rear Main Seal questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









