--- title: "transynd allison transmission fluid — Niche Verdict: Skip it (33/100) | Amazon United States - Flapen" canonical_url: "https://flapen.com/amazon/research/us/automotive/transynd-allison-transmission-fluid" last_updated: "2026-07-09T23:06:10.673Z" locale: en meta: description: "a concentrated shelf (top 5 take 97% of clicks) — transynd allison transmission fluid doesn't clear our bar today." "og:description": "a concentrated shelf (top 5 take 97% of clicks) — transynd allison transmission fluid doesn't clear our bar today." "og:title": "transynd allison transmission fluid — Niche Verdict: Skip it (33/100) | Amazon United States - Flapen" --- Back to Flapen home # **transynd allison transmission fluid** **Skip it****33/100 ** a concentrated shelf (top 5 take 97% of clicks) — transynd allison transmission fluid doesn't clear our bar today. **Market/yr** **$166K** **Growth (1y)** **+104.8%** **Products** **6** **Brands** **3** was 3 a year ago **Sellers** **29** **Price range** **$19.64–$184.50** **Returns** **1.4%** **Rating** **4.7★** **Skip it** Scored 33/100 across market size, growth, competition, quality gap, and returns. Market sizeGrowthCompetitionQuality gapReturns Market size **8** ×0.30 Growth **66** ×0.30 Competition **0** ×0.20 Quality gap **22** ×0.10 Returns **89** ×0.10 ## **Demand** Weekly Amazon search volume, last 104 weeks — +104.8% year over year. 1K551.5Spike '25Prime Day '25Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26 ## **Seasonality** Monthly demand index across the year — 1.00 is average. JFMAMJJASOND No pronounced peak months · busiest ÷ quietest = 2.1× ## **Competition** - Castrol95% - XUJI3% - ACDelco3% The top 5 products capture 97% of clicks — a locked-up shelf that new listings rarely crack. 3 brands and 29 sellers compete here. **Brands** **3 **—flat was 3 a year ago **Sellers** **29** **Top 5 brand share** **100%** #ProductBrandPriceRatingReviewsClick shareTrend 1 ![Castrol TranSynd 668 Synthetic Automatic Transmission Fluid 1 gal](https://m.media-amazon.com/images/I/31Z4d-Jz1TL.jpg) [**Castrol TranSynd 668 Synthetic Automatic Transmission Fluid 1 gal**](https://www.amazon.com/dp/B095SZB2DK) Castrol$45.374.8★1,03237%▼falling 2 ![Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid 1 Gallon Pack of 3](https://m.media-amazon.com/images/I/41FdRRefYIL.jpg) [**Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid 1 Gallon Pack of 3**](https://www.amazon.com/dp/B0F1DKXF3T) Castrol$121.814.9★9835%▲rising 3 ![Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid 5 Gallon Pail](https://m.media-amazon.com/images/I/41I7vWSIH9L.jpg) [**Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid 5 Gallon Pail**](https://www.amazon.com/dp/B0977Q8S49) Castrol$184.504.8★32617%▼falling 4 ![Castrol TranSynd 668 Allison 2021 Updated SPEC CASE of 3 by DOXA Worldwide](https://m.media-amazon.com/images/I/31Z4d-Jz1TL.jpg) [**Castrol TranSynd 668 Allison 2021 Updated SPEC CASE of 3 by DOXA Worldwide**](https://www.amazon.com/dp/B095SYBWQZ) Castrol$126.964.8★1,0325%▼falling 5 ![XUJI Tomboy Trans Transgender Cotton Chest Binder Plus Size Short Tank Top with Stronger Elastic Band (DG 4XL) Dark Grey](https://m.media-amazon.com/images/I/514VciUGPcL.jpg) [**XUJI Tomboy Trans Transgender Cotton Chest Binder Plus Size Short Tank Top with Stronger Elastic Band (DG 4XL) Dark Grey**](https://www.amazon.com/dp/B07W1KJJHQ) XUJI$19.644.0★1,9783%▲rising 6 ![ACDelco GM Original Equipment 10-9395 Dexron VI Automatic Transmission Fluid - 1 gal](https://m.media-amazon.com/images/I/314IMjzMXlL.jpg) [**ACDelco GM Original Equipment 10-9395 Dexron VI Automatic Transmission Fluid - 1 gal**](https://www.amazon.com/dp/B01EKMGG92) ACDelco$36.844.8★7,8233%—flat ## **Product shelf** All 6 tracked products in this niche. Top sellersNewestTrending [![Castrol TranSynd 668 Synthetic Automatic Transmission Fluid 1 gal](https://m.media-amazon.com/images/I/31Z4d-Jz1TL.jpg)**Castrol TranSynd 668 Synthetic Automatic Transmission Fluid 1 gal** Castrol**$45.37**4.8★1,032 reviews](https://www.amazon.com/dp/B095SZB2DK) [![Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid 1 Gallon Pack of 3](https://m.media-amazon.com/images/I/41FdRRefYIL.jpg)**Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid 1 Gallon Pack of 3** Castrol**$121.81**4.9★98 reviews](https://www.amazon.com/dp/B0F1DKXF3T) [![Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid 5 Gallon Pail](https://m.media-amazon.com/images/I/41I7vWSIH9L.jpg)**Castrol TranSynd 668 Full-Synthetic Automatic Transmission Fluid 5 Gallon Pail** Castrol**$184.50**4.8★326 reviews](https://www.amazon.com/dp/B0977Q8S49) [![Castrol TranSynd 668 Allison 2021 Updated SPEC CASE of 3 by DOXA Worldwide](https://m.media-amazon.com/images/I/31Z4d-Jz1TL.jpg)**Castrol TranSynd 668 Allison 2021 Updated SPEC CASE of 3 by DOXA Worldwide** Castrol**$126.96**4.8★1,032 reviews](https://www.amazon.com/dp/B095SYBWQZ) [![XUJI Tomboy Trans Transgender Cotton Chest Binder Plus Size Short Tank Top with Stronger Elastic Band (DG 4XL) Dark Grey](https://m.media-amazon.com/images/I/514VciUGPcL.jpg)**XUJI Tomboy Trans Transgender Cotton Chest Binder Plus Size Short Tank Top with Stronger Elastic Band (DG 4XL) Dark Grey** XUJI**$19.64**4.0★1,978 reviews](https://www.amazon.com/dp/B07W1KJJHQ) [![ACDelco GM Original Equipment 10-9395 Dexron VI Automatic Transmission Fluid - 1 gal](https://m.media-amazon.com/images/I/314IMjzMXlL.jpg)**ACDelco GM Original Equipment 10-9395 Dexron VI Automatic Transmission Fluid - 1 gal** ACDelco**$36.84**4.8★7,823 reviews](https://www.amazon.com/dp/B01EKMGG92) ## **Reviews** What buyers praise and complain about, mined from review topics. ### **What buyers love ** **Quality-Overall**33% *“Quality product for GM cars”* **Value For Money**25% *“Best price”* **Advertised Vs Actual Product**14% *“As expected”* **Maintenance And Repair**6% *“All maintenance matters”* **Efficiency**6% *“Works great in my Tahoes transmission”* **Lubrication**3% *“Great fluid”* **Motor Power**3% *“Best for GM trucks”* **Filtration**3% *“Genuine gm transmission fluid A+ It's a must when changing transmission filters”* **Ease Of Use**2% *“Convenient way to buy”* **Comfort-Overall**1% *“Comfortable”* ### **What buyers complain about ** **Leak-Proof**33% *“Leaking product”* **Stain Resistance**17% *“upon arrival the box was stained”* **Size-Overall**7% *“not seamless on larger chests. C+”* **Chest Fit**7% *“not seamless on larger chests. C+”* #### **Top return reasons**- Leak-Proof28% - Compatibility-Overall23% - Value For Money16% - Advertised Vs Actual Product10% - Functionality-Overall4% - Certifications3% - Material Quality3% - Size-Overall3% - Lubrication3% - Defective Material/Parts2%