7 Best Transmission Coolers of 2021

Jerry Wilson
Written by
Last update:

If you’re a diesel truck driver, some form of a transmission cooler is pretty much a necessity. Without one, your transmission can easily overheat, risking damage to other parts of the truck, costing you money.

They also get your engine oil flowing evenly to the rest of the engine and also help to conserve it. They work by having the transmission fluid go through a radiator-like core and then back to the transmission, thereby cooling it down. While it won’t cool down as much as a full radiator, it’s enough in most cases!

I’ve listed some of my favorite transmission coolers below that are sure to keep your engine running smoothly.

NameCategoryProduct
Hayden Automotive 679 Rapid-Cool Plate and Fin Transmission CoolerBest OverallHayden Automotive 679 Rapid-Cool Plate and Fin Transmission Cooler
Hayden Automotive 678 Rapid-Cool Plate and Fin Transmission CoolerBudget PickHayden Automotive 678 Rapid-Cool Plate and Fin Transmission Cooler
Mishimoto – MMOC-F Heavy Duty Transmission Cooler W/Electric FanUpgrade PickMishimoto - MMOC-F Heavy Duty Transmission Cooler W/Electric Fan

1. Hayden Automotive 679 Rapid-Cool Plate and Fin Transmission Cooler

Our rating: 9 / 10

Hayden Automotive 679 Rapid-Cool Plate and Fin Transmission Cooler

Check Price on Amazon

Pros:

  • Huge 6.5-gal rapid-cool fluid capacity
  • Includes an auxillary cooler
  • 6,000-hour average longevity rating
  • High quality and great value
  • Multiple hose and electrical cutout locations

Cons:

  • Can make a slight whistling sound
  • Plastic shield is not as sturdy as competitors

Hayden Automotive is a New Mexico-based company that has served the auto repair and coolant industries since 1939. When looking to build a transmission cooler, Hayden Automotive did not just slap their name on an average cooler – they brought their experience and expertise to the design of this innovative cooler.

This Hayden Engine Oil Cooler is designed to be installed on opposed piston engines (both in the front and rear of the engine compartment). The large 6.5 gallon tank is divided into two chambers, one for the cooling fluid and one for engine oil.

The rapid-cool system is ideal for engines that require transmission coolers and works well in most transmission cooling applications. This cooler comes with two 12 Reel – 1/4 Hose, two 1/2 Hose Braids, and one 1 Hose Braids.

2. Assault Racing Products A5053X 24 Finned Aluminum Double Pass Transmission Trans Cooler

Our rating: 9 / 10

Assault Racing Products A5053X 24 Finned Aluminum Double Pass Transmission Trans Cooler

Check Price on Amazon

Pros:

  • Adds 10hp to your car
  • Affordable
  • Simple to install
  • Easy to maintain

Cons:

  • Heavy as a single aluminum unit
  • Fails to drop oil temperature
  • No quicker than stock

If you want that extra power that every automotive enthusiast craves, then you’ve come to the right place. The Assault Racing Products A5053X 24 Finned Aluminum Double Pass Transmission Trans Cooler – Dual Line Universal Oil Cooler is a great way to get it.

What makes this a great fit for your engine? It consists of two, 24-inch long plates double-pass aluminum finned coolers. This means that you can get more power because there’s less heat build-up.

The welded fin design and precision machined cooling plates allow for more cooling for an added 10hp on average. Another great thing about this cooler is that it’s a direct oil cooler line … no extra connections or lines.

3. Hayden Automotive 526 Remote Transmission Oil Cooling System

Our rating: 8 / 10

Hayden Automotive 526 Remote Transmission Oil Cooling System

Check Price on Amazon

Pros:

  • Easy to install
  • Works with several different vehicles
  • Blocks heat from doing serious damage

Can’t the transmission of your car get damaged easily from the heat generated by the engine oil?

If that’s the case, then you need a quality transmission oil cooler to remedy the situation. You will find options ranging from on-demand cooling to standard oil coolers which heat the transmission oil further to be able to increase the cooler’s performance. The above system will provide the best as it will not only heat but cool the transmission oil to keep the vehicle running smoothly and prevent damages to the transmission oil.

If you are unsure of whether to go with a cooler that cools the transmission oil or heats the transmission, you better pick the Hayden Automotive as it has the best features.

4. Hayden Automotive 678 Rapid-Cool Plate and Fin Transmission Cooler

Our rating: 8 / 10

Hayden Automotive 678 Rapid-Cool Plate and Fin Transmission Cooler

Check Price on Amazon

Pros:

  • Comes with Flex-Tube
  • Includes mounting brackets
  • Has an electric fan
  • Flex-Tubes allow for more mounting options
  • Ideal for vehicles with limited space between the radiator and driveshaft
  • Dual mounting systems, so you're not limited to a "universal" mounting system
  • Features an industry first, patented "Directional Core Technology" to increase efficiency and cooling, while reducing overall weight
  • Easy to install
  • Affordable
  • Comes with a 3-year full warranty

Cons:

  • Electric fan can be noisy during operation
  • Can be difficult to mount without auxiliary mounting brackets
  • Flimsy electric fan
  • Cores do not have seperate holding areas, so they are designed to be mounted horizontally or vertically interchangeably.

The Hayden Automotive 678 transmission cooler is a quality transmission cooler that is capable of holding a higher volume of transmission fluid than most other coolers on the market. It includes a high quality electric fan and flex-tubes.

It is outfitted with directional cores that compress fluid as it flows into cooling areas. This makes the cooler more efficient than traditional cores. It is ideal for vehicles that have a limited amount of space between the transmission and driveshaft.

5. B&M 70268 SuperCooler Automatic Transmission Cooler

Our rating: 8 / 10

B&M 70268 SuperCooler Automatic Transmission Cooler

Check Price on Amazon

Pros:

  • Reduced slippage
  • Prevents overheating
  • Transmission cooler with automatic thermostat, all in one
  • Proven in competition vehicles
  • Keeps temperature up to 25o degrees Fahrenheit lower than ambient outside temperatures
  • Increases vehicle’s fuel efficiency
  • Reduces maintenance costs
  • Lowers exhaust emissions
  • Increases horsepower
  • A maintenance-free, self-adjusting transmission cooler

Cons:

  • Does not fit in all vehicles
  • Can be expensive replacement depending on vehicle
  • Does not come with easy to read instructions
  • Not for vehicles with extended dipstick
  • Error code in temperature sensor is a common issue

The B&M 70268 SuperCooler Automatic Transmission Cooler is our top transmission cooler pick for 2020.

What we loved about this transmission cooler is that it meets the demands of today’s tough driving conditions with its automatic thermostat. It has been designed to deliver superior cooling for your transmission, while also increasing fuel efficiency, reducing maintenance costs, and reducing exhaust emissions for your vehicle.

This transmission cooler also reduces slippage, keeping your transmission cool and performing at its best.

6. Derale 13504 Series 8000 Plate and Fin Transmission Oil Cooler

Our rating: 8 / 10

Derale 13504 Series 8000 Plate and Fin Transmission Oil Cooler

Check Price on Amazon

Pros:

  • Durable
  • Easy to install
  • Gets the job done

Cons:

  • Heavy
  • Can be quite expensive

The Derale 13504 is a well-performing transmission cooler that’s easy to install and get the job done. The description says it only applies to Toyota/Scion/Lexus/Subaru/Volkswagen, but the adapters in the kit work for other popular vehicles as well.

It’s a very durable cooler that functions effectively and does get the job done. It’s also easy to install to your car. However, the unfortunate part is that it’s almost 100% aluminum. So, it’s a bit heavier than some of the other options on the market. But of course, that’s going to mean more durability. It’s also quite expensive. However, you get what you pay for. If you’re after something affordable, you’ll need to look elsewhere.

But, if you’ve got the money and want a durable, high-performance transmission cooler that’s easy to install and get the job done, you should consider the Derale 13504.

7. B&M 70255 SuperCooler Automatic Transmission Cooler

Our rating: 8 / 10

B&M 70255 SuperCooler Automatic Transmission Cooler

Check Price on Amazon

Pros:

  • Automatic transmission cooler
  • Compact design
  • Good value for the price

The B&M Super Cooler Automatic Transmission Cooler is perfect for trucks that are used for hard labor. This automatic transmission cooler can automatically regulate the temperature in your transmission, which saves you a lot of time. It doesn’t just cool the transmission, it keeps it locked in place within the compartment so that you don’t have to worry about the transmission staying cool at all times.

The cooler automatically regulates the transmission temperature and protects the sensitive parts, which extends the lifespan of the transmission. It has a casing, which was designed to be fitted inside the transmission. It was crafted with precision to ensure that it fits perfectly into truck transmissions from a variety of manufacturers. The cover is made out of a thick plastic material that will withhold the extra heat that’s produced by the transmission.

The cooler features a durable aluminum alloy and zinc anode, a manual drain lever, and a thermometer that is installed inside of the unit to assist you and see the most accurate reading. There is a reliable automatic cooler that’s ready for the big jobs and is easy to fix.

8. HotRod99 15" Satin Aluminum Finned Dual Pass Transmission Cooler Black

Our rating: 8 / 10

HotRod99 15" Satin Aluminum Finned Dual Pass Transmission Cooler Black

Check Price on Amazon

Pros:

  • Easy to install
  • Great design
  • Cooler can be used in all types of vehicles

Cons:

  • The coupler is heavier than the cooler
  • Some packaging seems a bit basic

9. Derale 13502 Series 8000 Plate and Fin Transmission Oil Cooler

Our rating: 8 / 10

Derale 13502 Series 8000 Plate and Fin Transmission Oil Cooler

Check Price on Amazon

Pros:

  • Oil Pan Capacity of 9.5 Quarts
  • Fin and Plate Technology
  • Trusted Brand
  • Double The Lifetime of A Stock Oil Cooler

The Derale 13502 Series 8000 Plate and Fin Transmission Oil Cooler Kit is an ideal piece of kit if you’re looking to enhance the cooling efficiency of your transmission for a longer life. This kit includes a durable brass transmission oil cooler and all the fittings you need to get it in place.

The Derale 13502 Series 8000 Plate and Fin Transmission Oil Cooler Kit utilizes a plethora of patented technologies to make an already amazing oil cooler even better. In addition to the massive plate and fin design, this transmission oil cooler kit incorporates a heat-resistant billet aluminum housing for better durability.

The massive capacity of this transmission oil cooler will outs better than a stock oil cooler. This cooling system can sustain up to 100 psi without worry.

10. B&M 70264 SuperCooler Automatic Transmission Cooler

Our rating: 8 / 10

B&M 70264 SuperCooler Automatic Transmission Cooler

Check Price on Amazon

Pros:

  • Thermostatically controlled internal cooler
  • Built-in water overflow safety system
  • Automatic thermal protection
  • Positive pressure nitrogen purge system
  • Easy installation
  • Made in the USA

The 70264 SuperCooler transmission cooler is the best automatic transmission cooler available. It makes use of a powerful 25W fan circulates over a gallon of water in less than 5 minutes. Even though it has automatic thermal protection, the SuperCooler automatically shuts itself off after the job is done to prevent internal ice damage.

Interestingly, the manufacturer, Bosch, has used positive pressure nitrogen purge in this cooler, reminiscent of the nitrogen purge systems that power the anti-lock brakes in the heavier vehicles. This helps to minimize failures due to internal ice.

The SuperCooler uses an overhead water reservoir that removes the need for the transmission dipstick to refill the cooler reservoir as it can do so by itself at regular intervals.

11. Mishimoto – MMOC-F Heavy Duty Transmission Cooler W/Electric Fan

Our rating: 8 / 10

Mishimoto - MMOC-F Heavy Duty Transmission Cooler W/Electric Fan

Check Price on Amazon

Pros:

  • Affordable
  • Ease of installation
  • Easy to use
  • Durable
  • Lightweight

Fully-loaded with a 3/8” inlet and outlet port connectors, adjustable push-to-connect swivel fittings, as well as an integrated fan inlet, the Mishimoto transmission cooler has everything you need to thoroughly keep your transmission safe.

It features a CNC machined mounting bracket to make the job of installation a breeze. What’s more, the hard lines that make up the system are also already cut to perfect length to fit a variety of vehicles. All you need to do is use a coupler/flare tool to connect the hard lines to the right plugs.

The cooler is also highly reversible, which means you get to choose between placing the cooler on the left or right side of the transmission case. A flexible cooler hose handles the fitting of the cooler to the block. This hose has a silicone liner inside, which helps to reduce heat from the transmission.

12. Derale 13503 Series 8000 Plate and Fin Transmission Oil Cooler

Our rating: 7 / 10

Derale 13503 Series 8000 Plate and Fin Transmission Oil Cooler

Check Price on Amazon

Pros:

  • Excellent heat dissipation
  • Lightweight
  • Easy to install
  • Three-year warranty

The Derale 13503 Series 8000 Plate and Fin Transmission Oil Cooler is an efficient and affordable option for your transmission cooler. It’s great for anyone who’s looking for a replacement or a new transmission cooler with minimal work.

This transmission cooler is made from high-quality aluminum fins with a copper plated base that efficiently dissipate heat giving you a cooler transmission.

To increase heat dissipation, the fins are fitted with a high-performance electric fan with a pull-cord that allows access. This makes it very easy to change the speed settings at any time.

Frequently Asked Questions (FAQ)

What's the best transmission cooler?

However, we found there are not many reviews out there on the best transmission cooler. We used the same criteria to test these products: “The transmission cooler should be effective to decrease the transmission fluid temperature to enhance the transmission life.” For transmission fluid, it’s a blood for all vehicles. It has to circulate in a vehicle to ensure the best performance. In order to prolong the transmission life, the transmission coolers need to keep the transmission fluid at a normal temperature, so it could effectively extend the transmission life.

Since there are so many transmission coolers in the market with similar prices, we do not like to buy a product without knowing some reviews. We found some reviews on some famous transmission coolers, which are regarded as the best transmission coolers. Through the analysis, we also found that the transmission coolers below could do well in reducing the transmission fluid temperature:

How do I choose a transmission cooler?

When choosing a transmission cooler for your car, you need to first figure out what brand of transmission you have. The cooling systems are not all interchangeable so it’s important to make sure you’re purchasing the correct replacement. Transmission company colors and logo placement can vary depending on the vehicle but don’t let that confuse you. If you have a 1998 Hyundai B7F engine, you have to get the Hyundai transmission cooler, even if the logo on it says “Mercury,” “Chevy,” “Dodge,” etc.

Will a transmission cooler help?

If you have a problem getting to work or school on time, a transmission cooler will not help much. The main function of a transmission cooler is to help when you are stuck in traffic.

A transmission cooler is a cooler for your transmission, not your radiator. They mount either directly to your transmission case or to your radiator to keep the transmission fluid from overheating.

If you have a manual transmission then a transmission cooler is a must. With a manual transmission, your transmission fluid can boil and, in the worst cases, transmit a foul odor and smoke. Even with an automatic transmission, overheating can cause your transmission to fail much sooner than normal.

The best reason for using a transmission cooler is to prevent overheating. This will increase the life of your transmission and could end up saving you a lot of money in repair bills.

Even if you have an automatic transmission, you could still benefit from a transmission cooler depending on the climate you live in.

What is a transmission cooler for towing?

The purpose of the transmission cooler for towing is to keep the heat that's caused by towing at a minimum. This is a common issue when driving and towing long distances because more time means more strain and more heat, which leads to overall accelerated wear and tear on the vehicle.

Additionally, when you're towing, you're putting more pressure on the engine. This is evident by the higher gas consumption you notice when traveling because of the extra strain. That's why having a transmission cooler for a truck is critical if you want to ensure you're getting the maximum travel mileage and lifespan out of your transmission.

Finally, it's important to know that not all transmission coolers are made the same, so you want to be sure you're buying one that's going to do the job properly.

Conclusion

The easiest way to prevent transmission damage is to invest in a reliable transmission cooler. Though it may be a bit early to take the cost into account, even if you’re on a tight budget, we encourage you to consider the benefits that a transmission cooler can offer. However, if you are looking for a budget option for a car, which may be used primarily as a family car, you may want to take a look at the CVT transmission cooler.

Our Recommendation

NameCategoryProduct
Hayden Automotive 679 Rapid-Cool Plate and Fin Transmission CoolerBest OverallHayden Automotive 679 Rapid-Cool Plate and Fin Transmission Cooler
Hayden Automotive 678 Rapid-Cool Plate and Fin Transmission CoolerBudget PickHayden Automotive 678 Rapid-Cool Plate and Fin Transmission Cooler
Mishimoto – MMOC-F Heavy Duty Transmission Cooler W/Electric FanUpgrade PickMishimoto - MMOC-F Heavy Duty Transmission Cooler W/Electric Fan