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Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler

4.7 4.7 out of 5 stars 1,711 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Automotive Replacement Engine Coolers by Hayden Automotive

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Purchase options and add-ons

Connector Type Hose Barb
Contact Material Aluminum
Brand Hayden Automotive
Operation Mode Automatic

About this item

  • 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
See more product details

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$50.55
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From the manufacturer

About Us

Since the invention of the transmission cooler by Mr. Perry Hayden in 1961, Hayden has continued to add innovative products to meet the needs of its customers while investing in continuous improvements and maintaining quality.

Hayden Automotive engineers, manufactures and supplies a wide range of products designed to keep your car, truck or performance vehicle running cool. From fan clutches and electric fans to performance oil and transmission coolers, we’ve got what you need to protect your vehicle from damaging and performance robbing heat.

Product 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.

Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here [PDF ]

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Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler


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What's in the box

  • Transmisison Cooler
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    Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler
    Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler
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    Price-14% $50.55
    List:$59.07
    -36% $30.88
    List:$47.94
    -18% $46.41
    List:$56.71
    -21% $51.60
    List:$65.72
    Delivery
    Get it as soon as Wednesday, Apr 3
    Get it as soon as Tuesday, Apr 2
    Get it as soon as Tuesday, Apr 2
    Get it as soon as Tuesday, Apr 2
    Customer Ratings
    Quality of material
    4.7
    4.6
    5.0
    4.8
    Value for money
    4.7
    4.7
    4.7
    4.8
    Easy to install
    4.5
    4.5
    4.7
    4.6
    Mileage
    4.4
    4.6
    4.8
    Longevity
    4.6
    5.0
    4.7
    Sold By
    Amazon.com
    Amazon.com
    Amazon.com
    Amazon.com
    contact material
    Aluminum
    Aluminum
    operation mode
    Automatic
    Automatic
    Automatic
    Automatic

    Looking for specific info?

    Customer reviews

    4.7 out of 5 stars
    4.7 out of 5
    1,711 global ratings

    Customers say

    Customers like the ease of installation using the relay. They mention that the instructions are clear and simple, and the included zip ties make install easy. They also appreciate the performance of the product, stating that it works well and helps perfectly for their needs. Customers also like the cooler, mentioning that it seems to cool the transmission better and that the cooling system had no problems. They praise the quality of the hose, describing it as heavy duty and top quality. Customers are also happy with the fit, praising it as universal and perfect size.

    AI-generated from the text of customer reviews

    157 customers mention142 positive15 negative

    Customers find the installation of the relay to be easy. They mention that the instructions are clear and simple, and the included zip ties make installation easy.

    "It was a quick and easy installation and works great" Read more

    "...However, the hose length is very generous, easy to mount, very subtle, and well made. Would purchase again if needed." Read more

    "No instructions….but easy to install….just had to figure out the transmission line routes…" Read more

    "...Took about a half hour to install, definitely a must have if you own a Titan." Read more

    154 customers mention150 positive4 negative

    Customers are satisfied with the performance of the relay. For example, they mention it works well, has excellent quality, and has no issues. Some say that it helps perfectly for their needs.

    "It was a quick and easy installation and works great" Read more

    "...Works amazing and seems like good quality" Read more

    "...It's been 9 months since the original install and no notable issues. The transmission also runs noticeably cooler based of the factory temp gauge." Read more

    "Works great for my titan Transmission Runs cooler" Read more

    94 customers mention86 positive8 negative

    Customers are satisfied with the cooler. They mention that it cools the transmission better, and the cooling system had no problems. Some say that the fluid at destination was warm, not hot to the touch. Overall, most are happy with their purchase and recommend it to others.

    "The universal trans cooler was better than expected. The only complain is that it does not come hose fittings; had to purchase locally...." Read more

    "Reduced transmission temperatures by at least 20F when plumbed in series with the oem cooler (built into radiator) on a 2014 Chevy Tahoe...." Read more

    "...The transmission also runs noticeably cooler based of the factory temp gauge." Read more

    "...Seems to cool the transmission better. A must for aftermarket torque converter! Happy customer! Thank you!" Read more

    75 customers mention72 positive3 negative

    Customers are satisfied with the quality of the relay. They mention that it is heavy duty, made of top quality hose, and fits snugly over the 3/8 fittings. It is easy to install and gives them much peace of mind.

    "...the hose length is very generous, easy to mount, very subtle, and well made. Would purchase again if needed." Read more

    "Good quality product installed on a 2011 Acura MDX...." Read more

    "...Works amazing and seems like good quality" Read more

    "...The included zip ties make install easy and the included hose is high quality gates hose. I couldn't be happier regarding the performance...." Read more

    60 customers mention44 positive16 negative

    Customers like the fit of the relay. For example, they mention it's a universal fit, the size is perfect, and suits their needs perfectly. Some say the hose length is very generous. Overall, most are happy with the fit and quality of the product.

    "...However, the hose length is very generous, easy to mount, very subtle, and well made. Would purchase again if needed." Read more

    "These coolers are the perfect size for the Jeep Cherokee xj I have them on two of mine and they both fit and perform great mounted them both in..." Read more

    "...oil cooler bracket, however, the flange on the Hayden cooler is not wide enough...." Read more

    "...to tow a small pop up camper with a 2011 Jeep Wrangler and it fits and works great...." Read more

    53 customers mention53 positive0 negative

    Customers appreciate the value of the transmission cooler. They say it's a great investment, worth the price, and will save money in the long run. Customers also say the quality of the cooler is excellent for the money. They mention that it'll protect their transmission from heat.

    "...had thousands of trouble-free miles with it -- plus, it was significantly cheaper and virtually identical...." Read more

    "The quality of the cooler is excellent for the money. I do like how this product is not made in China...." Read more

    "...This is cheap insurance for 700r4 transmissions that do NOT like heat at all. Picture is on the front of a Chevy K10...." Read more

    "...The value for this product was great and well worth the purchase. The images attached shown through the grill have the radiator cooler attached...." Read more

    21 customers mention21 positive0 negative

    Customers are satisfied with the appearance of the oil cooler. They mention that it is a good looking unit, and it works as expected.

    "...If you are a gizmo nut like me, wait till you see them. They look amazing...." Read more

    "Nice item and the installation was simple, but do yourself a favor and buy the right size hose clamps for $2 at the local auto parts/ hardware store...." Read more

    "...Even so Works well and made well. Nice kit." Read more

    "Just installed on a 2007 Honda Odyssey. Very nice piece and made in Australia (sorry, China)...." Read more

    20 customers mention12 positive8 negative

    Customers are mixed about the leakage of the relay. Some mention that it works well, while others say that it leaks. Some say that the cooler was defective and started to leak fluid through the fins.

    "...C performance with it partially obstructing the condenser and no leaks in three years so far." Read more

    "...It was NOT a snug fit and appeared to be a source for future leaks, even with clamps. This Hayden comes with 11/32 Gates hose...." Read more

    "...Everything works great and no leaks. Highly recommended!" Read more

    "...Which after a while leaks coolant into the transmission." Read more

    Nice price and easy enough to install on a Jeep XJ
    5 Stars
    Nice price and easy enough to install on a Jeep XJ
    Put this on my 98 Jeep XJ as a precautionary measure. I followed most of the instructions from a YouTube video by “Out Jeepin”. Making the brackets was probably the most time consuming parts.I bought a 3 ft. stick of 1/8”x1” steel flat bar from Lowe’s and cut it in half to make my brackets. They have a slight S bend in them as the video suggest doing so that the cooler sets a bit further back closer to the AC condenser.Overall it wasn’t too bad of an install. Took about 3-4 hours including cleaning up my tools and shop. I can comment on the effectiveness because I don’t have a temp gauge installed at this time. (Possibly a future addition)
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    Customer image
    5.0 out of 5 stars Nice price and easy enough to install on a Jeep XJ
    Reviewed in the United States on January 11, 2024
    Put this on my 98 Jeep XJ as a precautionary measure. I followed most of the instructions from a YouTube video by “Out Jeepin”. Making the brackets was probably the most time consuming parts.

    I bought a 3 ft. stick of 1/8”x1” steel flat bar from Lowe’s and cut it in half to make my brackets. They have a slight S bend in them as the video suggest doing so that the cooler sets a bit further back closer to the AC condenser.

    Overall it wasn’t too bad of an install. Took about 3-4 hours including cleaning up my tools and shop. I can comment on the effectiveness because I don’t have a temp gauge installed at this time. (Possibly a future addition)
    Images in this review
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    3 people found this helpful
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    Reviewed in the United States on November 12, 2023
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    Guillermo e.
    2.0 out of 5 stars DE POCA CAPACIDAD PARA TRANSMISIÓN DE CADILLAC SEVILLE 1999
    Reviewed in Mexico on March 10, 2021