Transmission Oil Cooler Kits

Heat is the number-one enemy of automatic transmissions. When fluid temperatures climb, the fluid breaks down, friction materials glaze, seals harden, and internal components...

Heat is the number-one enemy of automatic transmissions. When fluid temperatures climb, the fluid breaks down, friction materials glaze, seals harden, and internal components wear rapidly. A properly sized transmission cooler or complete transmission cooler kit keeps temperatures in the safe zone, delivering smoother shifts, longer fluid life, and reliable performance under the toughest conditions.

Why a Supplemental Transmission Cooler Is Essential for Towing and High-Stall Torque Converter Applications

Towing places a continuous extra load on the transmission. Climbing grades, stop-and-go traffic with a trailer, and sustained...

Why a Supplemental Transmission Cooler Is Essential for Towing and High-Stall Torque Converter Applications

Towing places a continuous extra load on the transmission. Climbing grades, stop-and-go traffic with a trailer, and sustained highway speeds all increase torque converter slip and generate substantial heat. Factory coolers (often just a small oil-to-water heat exchanger in the radiator tank) frequently struggle to keep up, especially in hot weather or mountainous terrain. Temperatures can quickly exceed 220–250°F, where fluid life is cut in half with every additional 20°F rise.

High-stall torque converters used in performance builds create even more heat. These converters allow higher engine RPM before lock-up, producing greater fluid shear and elevated temperatures during launches, street driving, and track use. A supplemental transmission cooler provides the extra cooling capacity needed to maintain ideal fluid temperatures (typically 175–200°F under load), protect clutches and seals, support consistent converter lock-up, and prevent costly transmission overheating failures.

Transmission coolers deliver longer component life, better shift quality, and peace of mind whether you’re hauling a trailer or running a high-stall converter in your race vehicle.

Types of Transmission Coolers and Their Benefits

Choosing the right design depends on your vehicle, duty cycle, and available space:

Tube-and-Fin Coolers - Hot fluid flows through aluminum tubes fitted with external fins and internal turbulators that create turbulence for better heat transfer. These are the most affordable and widely available style of transmission cooler. They work well for moderate towing, daily drivers, and older vehicles, and are preferred for their low cost, simple installation, and good durability. Tube-and-fin coolers are generally less efficient per square inch than plate-style units, so larger physical size is often required for heavy-duty use.
Plate (Plate-and-Fin or Stacked-Plate) Coolers - Fluid travels through multiple flat plates that maximize surface contact and promote turbulent flow, while air passes over dense external fins. Plate-style coolers deliver significantly higher cooling efficiency in a more compact package, with lower pressure drop than tube-and-fin designs. They are the preferred choice for serious towing, diesel trucks, and performance applications where maximum heat dissipation and durability matter. Stacked-plate versions offer the highest capacity for extreme-duty applications.
Heat Sink Coolers - These compact units rely primarily on a large mass of finned aluminum to absorb and radiate heat, sometimes with limited airflow dependence. They are useful in tight spaces or as supplemental coolers where traditional units won’t fit. Benefits include simple mounting and effectiveness in low-airflow situations, though overall capacity is typically lower than dedicated air-to-fluid plate or tube-and-fin coolers.

Most transmission cooler kits include mounting hardware, hoses, fittings, and sometimes electric fans for low-speed or stationary cooling.

How to Select the Right Cooler Size for Your Application

Proper sizing is one of the most important factors in cooler performance. An undersized unit will struggle under load, while a correctly matched cooler provides a strong safety margin without unnecessary bulk.

Most aftermarket coolers are rated by Gross Vehicle Weight (GVW) capacity. This rating indicates the total vehicle weight(plus a trailer, where applicable) the cooler is designed to support when used as a supplemental cooler (in addition to the factory oil-to-water unit located in the radiator).

As a general guideline:

Light-duty or occasional towing/passenger cars: 10,000-18,000 lb. GVW rating
Mid-size trucks, SUVs, and moderate towing (up to 7,500 lb.): 18,000-26,000 lb. GVW rating
Heavy-duty trucks, frequent towing, or high-stall torque converter performance use: 25,000-40,000+ lb. GVW rating

A common rule of thumb is to select a cooler rated for at least two to three times the combined weight of your vehicle and the heaviest trailer you plan to tow. For vehicles with high-stall torque converters or performance modifications, plus those used for frequent mountain driving or operation in hot climates, size up for extra capacity.

Other factors to consider when selecting a cooler:

Available mounting space and airflow (front of the radiator/condenser is best)
Cooler design efficiency (plate-style units cool more effectively than similarly sized tube-and-fin models)
Expected duty cycle (daily towing or track use demands more capacity than occasional light hauling)

When in doubt, choose the larger cooler. Oversizing is rarely a problem with automatic transmission fluid and provides valuable protection during the most demanding conditions.

Why Line and Attachment Size Matters

Proper fluid flow is critical. Undersized lines or restrictive fittings create pressure drop, reduce cooler efficiency, and can starve the transmission of fluid volume. Matching the cooler’s inlet/outlet size (commonly 3/8", 1/2", or AN fittings) to the vehicle’s transmission cooler ports and using appropriately rated high-temperature hose prevents flow restrictions, pressure spikes, and leaks. Always use the correct adapters and avoid stepping down to smaller lines when possible. Correct sizing ensures the cooler can circulate the volume of fluid needed for effective heat removal without compromising system pressure or reliability.

Trusted Brands for Transmission Coolers

Reliable performance starts with quality construction. Summit Racing’s popular brands include:

TYC: Direct-fit and OE-style replacement coolers with solid value
Derale: Performance-focused plate-fin and remote kits, including fan-equipped units for extreme duty
Fluidyne: High-efficiency coolers engineered for serious heat dissipation
Hayden: Long-standing leader known for Rapid-Cool plate-and-fin designs and thermal-bypass options
Mishimoto: Premium aluminum construction, stacked-plate designs, and vehicle-specific kits
Dorman: Dependable OE-replacement and aftermarket coolers
Other respected names such as PPE, Fleece Performance, and Coast to Coast also offer proven solutions across a wide range of applications

Whether you need a basic tube-and-fin unit for light towing or a high-capacity stacked-plate transmission cooler kit for heavy hauling and high-stall converters, selecting a reputable brand ensures the durability and cooling performance your transmission deserves.

Keep your transmission cool, protect your investment, and maintain peak performance under load with the right transmission cooler from Summit Racing. Choose the right transmission cooler today and say goodbye to transmission overheating worries.

Showing In Stock Items. Show All 554 Items.

Individual Parts

Part Groups

Results 1 - 25 of 405

Derale 9500 Series 13-Row Fin and Plate Aluminum Transmission Cooler 13633

Fluid Cooler, 9500 Series Fin and Plate Transmission Cooler, Tube and Fin, 13 Rows, Aluminum, Natural, Rated Up To 34,000 GVW, Kit

Part Number: DER-13633

4.1 out of 5 stars ( 10 )