--- product_id: 1770212 title: "678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler" brand: "hayden automotive" price: "488.13 DT" currency: TND in_stock: true reviews_count: 8 url: https://www.desertcart.tn/products/1770212-678-universal-rapid-cool-9-5-x-11-add-on store_origin: TN region: Tunisia --- # Compact 9.5" x 11" size Patented turbulation boosts heat transfer Supports GVWR up to 24,000 lbs & towing 5,000 lbs 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler **Brand:** hayden automotive **Price:** 488.13 DT **Availability:** ✅ In Stock ## Summary > ❄️ Keep your transmission chill and your ride unstoppable! ## Quick Answers - **What is this?** 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler by hayden automotive - **How much does it cost?** 488.13 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/1770212-678-universal-rapid-cool-9-5-x-11-add-on) ## Best For - hayden automotive enthusiasts ## Why This Product - Trusted hayden automotive brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable Build Quality:** Robust aluminum construction with thick 19mm hose barb fittings ensures leak-free, long-lasting performance - • **Easy Installation Kit:** Includes cooler, hoses, mounting hardware, and zip ties for a clean, professional fit behind your grille - • **Heavy-Duty Compatibility:** Engineered for pick-up trucks, vans, Class C motorhomes, and trailers up to 24 feet - • **Precision Compact Design:** Fits seamlessly in tight engine bays without bulk - • **Advanced Heat Transfer Tech:** Patented internal turbulation maximizes cooling efficiency while minimizing pressure loss ## Overview The Hayden 678 Universal Rapid-Cool Transmission Cooler is a premium, compact plate-and-fin cooler designed to dramatically reduce transmission temperatures for vehicles up to 24,000 lbs GVWR. Featuring patented internal turbulation technology, it enhances heat dissipation with minimal pressure drop, ensuring longer transmission life. The kit includes all necessary components for straightforward installation, making it the trusted choice for professional-grade cooling in trucks, vans, motorhomes, and trailers. ## Description This Is A Premium Style Transmission Cooler Kit. Coolers Are A Compact Plate And Fin Design. 19 Millimeter Thick-Hose Barb Fittings Offer Secure Attachment. All Rapid Coolers Include The Patented "Flow Path Design" Which Increases Heat Transfer While Minimizing Pressure Drop. Kits Contain Cooler, Hose And Mounting Hardware. Review: Super happy with these! Excellent quality! - First of all, the quality of the radiator itself is very very solid and well made. The heat sink fins are not too thin like many other aftermarket coolers. It’s very well made, and I’ve always had great luck with Hayden products, like their fan clutches, and transmission fittings. I originally bought a Chinese knockoff 40k trucool transmission cooler and I had to return it even before I even put it in my truck because of how poor the thickness of the radiator fins were. I could literally bend them with my finger nails. Did not feel comfortable about putting it in my truck. It was a massive leak waiting to happen. So I bought this Hayden cooler. It was actually cheaper than the 40k knockoff, and it’s much stronger and better built. I will be installing this tomorrow. EDIT: I installed these 2 days ago. Install was very easy, it look me about 3-4 hours because of all the custom mounting brackets I made, and all the hose routing with protective looms on it. But install was very easy and straightforward. I’ve been driving for the past two days with my scan tool hooked up to monitor the transmission temp, and I’m very happy to see that my transmission temperature does not go above 165F, even in slow stop and go traffic. Before I installed the cooler, my transmission temperature temp used to be around 190F-200F, but I’m glad to see how much cooler it is after the install. Very happy with the results, and this modification will definitely make my transmission last much longer. Review: Best Transmission Cooler - Installed on a 98 Jeep Cherokee and it works great! The cooler does an amazing job at cooling the transmission and was well worth the time and money to install. It fits perfectly behind the grill and the hose is a match to the factory line size. The included zip ties have held up and you can barley tell they are there and it all fits cleanly behind the grille. ## Features - Size Is 3/4 Inch X 11 Inch X 9-1/2 Inch - Pick-Up Trucks And Vans, Class "C" Motor Homes , Travel Trailers To 24 Feet - Gvwr Up To 24,000 Pounds, Towing Up To 5,000 Pounds - Patented Internal Turbulation Increases Heat Transfer With Minimal Pressure Drop ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000C3DDKO | | Best Sellers Rank | #32,396 in Automotive ( See Top 100 in Automotive ) #2 in Automotive Replacement Engine Coolers | | Brand | Hayden Automotive | | Brand Name | Hayden Automotive | | Connector Type | Hose Barb | | Contact Material | Aluminum | | Customer Reviews | 4.7 out of 5 stars 1,960 Reviews | | Global Trade Identification Number | 00036752006786 | | Included Components | Transmisison Cooler | | Item Type Name | Transmisison Cooler | | Item Weight | 1.1 Pounds | | Manufacturer | Hayden Automotive | | Model | 678 | | Mounting Type | Surface Mount | | Operation Mode | Automatic | | Part Number | 678 | | UPC | 036752006786 | | Unit Count | 1.0 Count | | Warranty Description | 1 year or 12K Miles | ## Product Details - **Brand:** Hayden Automotive - **Connector Type:** Hose Barb - **Contact Material:** Aluminum - **Mounting Type:** Surface Mount - **Operation Mode:** Automatic ## Images ![678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler - Image 1](https://m.media-amazon.com/images/I/81h6hePwK3L.jpg) ## Questions & Answers **Q: Anyone used this for a 3rd gen 4runner?** A: Yes, works great **Q: does it fit a 2009 toyota tacoma** A: Hello T. The 678 rapid-cool transmission cooler does not require any other fittings for it to be mounted for your application. So yes, it will work for your 2009 Toyota Tacoma. Bert CampRigid Hitch Amazon Sales **Q: how to install in 2007 nissan altima?** A: They have hardware to mount it directly to the back of your radiator. You attach it inline between the stock cooler and the transmission. **Q: Will this impact air condintioning performance?** A: It has not reduced the A/C cooling ( Miami, FL ) in my 2008 Equinox LTZ AWD 3.4L 6cyl , automatic Transmission Aisin Warner AF 33-5, except to lower the transmission coolant temperature by 20 degrees Fahrenheit while towing a Pop Up RV camper weighing a bout 2800 lbs. Good product. It will also increase the A/T fluid capacity by about 20 oz., obviously. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Super happy with these! Excellent quality! *by S***Y on June 6, 2025* First of all, the quality of the radiator itself is very very solid and well made. The heat sink fins are not too thin like many other aftermarket coolers. It’s very well made, and I’ve always had great luck with Hayden products, like their fan clutches, and transmission fittings. I originally bought a Chinese knockoff 40k trucool transmission cooler and I had to return it even before I even put it in my truck because of how poor the thickness of the radiator fins were. I could literally bend them with my finger nails. Did not feel comfortable about putting it in my truck. It was a massive leak waiting to happen. So I bought this Hayden cooler. It was actually cheaper than the 40k knockoff, and it’s much stronger and better built. I will be installing this tomorrow. EDIT: I installed these 2 days ago. Install was very easy, it look me about 3-4 hours because of all the custom mounting brackets I made, and all the hose routing with protective looms on it. But install was very easy and straightforward. I’ve been driving for the past two days with my scan tool hooked up to monitor the transmission temp, and I’m very happy to see that my transmission temperature does not go above 165F, even in slow stop and go traffic. Before I installed the cooler, my transmission temperature temp used to be around 190F-200F, but I’m glad to see how much cooler it is after the install. Very happy with the results, and this modification will definitely make my transmission last much longer. ### ⭐⭐⭐⭐⭐ Best Transmission Cooler *by R***T on January 25, 2026* Installed on a 98 Jeep Cherokee and it works great! The cooler does an amazing job at cooling the transmission and was well worth the time and money to install. It fits perfectly behind the grill and the hose is a match to the factory line size. The included zip ties have held up and you can barley tell they are there and it all fits cleanly behind the grille. ### ⭐⭐⭐⭐⭐ Great product *by D***M on March 27, 2026* Easy install was super easy to mount, great cooling, fit exactly where I needed it to, I have 2 of these on different trucks they are super durable and look good. Definitely recommend ## Frequently Bought Together - Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler - Hayden Automotive 253 Metal Mounting Bracket Kit - Magnefine 3/8" Magnetic Inline Transmission/Power Steering Filter --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/1770212-678-universal-rapid-cool-9-5-x-11-add-on](https://www.desertcart.tn/products/1770212-678-universal-rapid-cool-9-5-x-11-add-on) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-07-07*