10 Best transmission coolers of 2025

Explore top picks

Best Choice

1

Kmesonoxian

Kmesonoxian 1 PCS Automatic Transmission Oil Cooler fits Chevrolet Express 4500, Cargo, Pasajeros, 2500, 3500 2003 2004 2005 2006 2007 2008 2009-2019 fits GMC Savana 2500 2003-2019
9.8

Exceptional

Our Rating
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Value for Money

2

Mishimoto

Mishimoto Universal Fit Transmission Cooler, 13-Row Stacked Plate, 22.85" X 7.10” X 1.25” Core
9.6

Exceptional

Our Rating
3

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

Size and Capacity
Size Is 3/4 Inch X 11 Inch X 9-1/2 Inch, Gvwr Up To 24,000 Pounds, Towing Up To 5,000 Pounds

Ideal for Heavy-Duty Vehicles
Pick-Up Trucks And Vans, Class C Motor Homes, Travel Trailers To 24 Feet

Reliability and Cost-Effectiveness
Good quality product, significantly cheaper, trouble-free miles, excellent for maintaining transmission temperature, and extends transmission life
9.3

Excellent

Our Rating

9.7
worth the money

9.7
Temperature control

9.7
materials Quality
4

Lucky Seven

40k Transmission Oil Cooler LPD47391, Heavy Duty 40,000 GVW Max, Low Pressure Drop, Compatible with Tru-Cool,Includes Mounting Hardware-Ideal for Heavy Vehicles,40,000 GVW transmission cooler (Silver)
9.2

Excellent

Our Rating
5

GELUOXI

GELUOXI Transmission Oil Cooler with Bolts & High Flow 3/8" Inverted Flair Hex Fittings Brazed Aluminum Construction Replacement for 40,000lbs LPD47391
8.9

Very Good

Our Rating
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6

Gagsu
Gagsu 40k Transmission Oil Cooler lpd47391 Compatible with tru Cool Heavy Duty 40,000 GVW Max - Low Pressure Drop Trans Cooler
Main highlights

Key Features and Benefits
Handles up to 40,000 GVW with advanced low-pressure drop design, includes mounting hardware, and offers advanced cooling protection.

Ideal Use Cases
Perfect for large commercial trucks, trailers, and towing vehicles in need of efficient transmission cooling to enhance reliability and fuel efficiency.

Customer Reviews Highlight
Most praised for its easy installation process and the noticeable improvement in transmission temperature management.
Key specs
- Installation:Includes mounting hardware
- Manufacturer:Gagsu
- Dimensions:25.25 x 10.5 x 3.25 inches
- Compatibility:Heavy-duty vehicles
- Cooling Capacity:40,000 pounds GVW
8.6

Very Good

Our Rating

9.3
Easy installation

9.3
worth the money

9.1
materials Quality
7

SINTLY

SINTLY LPD47391 Low Pressure Drop 40k Transmission Oil Cooler Kit Compatible with Heavy Duty 40,000 GVW Max with Mounting Hardware
8.5

Good

Our Rating

9.1
Easy installation

8.7
worth the money

8.0
materials Quality
8

EVIL ENERGY
EVIL ENERGY 5/16" Transmission Oil Cooler, 6 Pass Tube and Fin Cooler Kit Universal Aluminium Black…
Main highlights

Key Features
Aluminum alloy cooler enhances ATF cooling, with easy installation. CPE hoses withstand high pressures and extreme temperatures for durability.

Ideal Use Cases
Best for vehicles with 5/16 ID transmission cooler lines, requiring efficient ATF cooling in high-temperature conditions and demanding environments.

Customer Praise
Most reviews highlight its effective cooling performance, durability, and straightforward installation instructions as top benefits.
8.3

Good

Our Rating

9.5
materials Quality

9.1
worth the money

8.9
Easy installation
9

A-Premium

A-Premium Transmission Oil Cooler, Universal Aluminium 8 Pass Tube and Fin, Oil Cooler Kit with Hose Mounting Kit
8.2

Good

Our Rating
10

Hayden Automotive
Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling (not for direct replacement of the factory unit)
Main highlights

Easy Installation
Pre-drilled mounting brackets and compatibility with OEM cooler systems make this transmission cooler easy to install.

Ideal for Heavy-Duty Use
Perfect for Class A motor homes, large travel trailers, and 5th wheel trailers with GVWR up to 30,000 pounds and towing up to 10,000 pounds.

Effective Temperature Reduction
Customers consistently praise the cooler's ability to significantly reduce transmission temperatures, often by 20-30 degrees Fahrenheit.
8.1

Good

Our Rating

9.9
Temperature control

9.9
materials Quality

9.7
worth the money

10 Best transmission coolers of 2025

1

Kmesonoxian 1 PCS Automatic Transmission Oil Cooler fits Chevrolet Express 4500, Cargo, Pasajeros, 2500, 3500 2003 2004 2005 2006 2007 2008 2009-2019 fits GMC Savana 2500 2003-2019

How do we rank?

How do we rank?

Analyzing top stores

2

Mishimoto Universal Fit Transmission Cooler, 13-Row Stacked Plate, 22.85" X 7.10” X 1.25” Core

3

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

9.7

9.7

9.7

4

40k Transmission Oil Cooler LPD47391, Heavy Duty 40,000 GVW Max, Low Pressure Drop, Compatible with Tru-Cool,Includes Mounting Hardware-Ideal for Heavy Vehicles,40,000 GVW transmission cooler (Silver)

5

GELUOXI Transmission Oil Cooler with Bolts & High Flow 3/8" Inverted Flair Hex Fittings Brazed Aluminum Construction Replacement for 40,000lbs LPD47391

6

Gagsu 40k Transmission Oil Cooler lpd47391 Compatible with tru Cool Heavy Duty 40,000 GVW Max - Low Pressure Drop Trans Cooler

9.3

9.3

9.1

7

SINTLY LPD47391 Low Pressure Drop 40k Transmission Oil Cooler Kit Compatible with Heavy Duty 40,000 GVW Max with Mounting Hardware

9.1

8.7

8.0

8

EVIL ENERGY 5/16" Transmission Oil Cooler, 6 Pass Tube and Fin Cooler Kit Universal Aluminium Black…

9.5

9.1

8.9

9

A-Premium Transmission Oil Cooler, Universal Aluminium 8 Pass Tube and Fin, Oil Cooler Kit with Hose Mounting Kit

10

Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling (not for direct replacement of the factory unit)

9.9

9.9

9.7

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