---
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: "497.42 DT"
currency: TND
in_stock: true
reviews_count: 8
category: "Hayden Automotive"
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 for max 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:** 497.42 DT
**Availability:** ✅ In Stock

## Summary

> ❄️ Keep your transmission chill, even when the road heats up!

## 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?** 497.42 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, secure installation
- • **Heavy-Duty Performance:** Handles heavy loads up to 24,000 lbs GVWR and towing up to 5,000 lbs effortlessly
- • **Precision Compact Design:** Fits seamlessly on trucks, vans & motorhomes without bulk
- • **Advanced Heat Transfer Tech:** Patented internal turbulation maximizes cooling efficiency with minimal pressure loss
- • **Universal Add-On Flexibility:** Easy install kit with hoses and mounting hardware—upgrade your transmission cooling without direct OE replacement

## Overview

The Hayden Automotive 678 Universal Rapid-Cool Transmission Cooler is a premium, compact add-on cooler designed for pick-up trucks, vans, and Class C motorhomes. Featuring patented internal turbulation technology, it significantly improves heat transfer while minimizing pressure drop, ensuring your transmission fluid stays below critical temperatures even under extreme conditions. Built with durable aluminum and secure 19mm hose barb fittings, it supports heavy-duty GVWR up to 24,000 lbs and towing capacities up to 5,000 lbs. This kit includes everything needed for a straightforward installation, making it a smart upgrade to extend transmission life and boost vehicle reliability.

## 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: Incredible Cooling! Keeps Trans Temp Below 87°C Even in the Extreme Phoenix Heat. - This rapid-cool transmission cooler works phenomenally well. Even though it is a universal add-on and not a direct-fit replacement, the installation process is straightforward with the included hardware. I live in Phoenix, and even with the extreme desert heat, my transmission fluid temperature now stays safely below 87°C (188°F). It has made a massive difference and gives me great peace of mind when driving. The unit is compact, highly efficient, and a smart investment to extend the life of your transmission!
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.

## 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 | #28,800 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 1,978 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 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

### ⭐⭐⭐⭐⭐ Incredible Cooling! Keeps Trans Temp Below 87°C Even in the Extreme Phoenix Heat.
*by E***O on July 9, 2026*

This rapid-cool transmission cooler works phenomenally well. Even though it is a universal add-on and not a direct-fit replacement, the installation process is straightforward with the included hardware. I live in Phoenix, and even with the extreme desert heat, my transmission fluid temperature now stays safely below 87°C (188°F). It has made a massive difference and gives me great peace of mind when driving. The unit is compact, highly efficient, and a smart investment to extend the life of your transmission!

### ⭐⭐⭐⭐⭐ 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.

## 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

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-08-13*