Transmission Oil Cooler

Heat builds quickly in an automatic transmission during towing, hauling, steep grades, stop and go traffic, hot weather, and performance driving. An additional transmission cooler can help the transmission cooling system transfer heat away from the automatic transmission fluid, while properly matched cooler lines keep fluid moving through the system. Evil Energy offers a universal transmission oil cooler, a fitment specific Dodge Ram heat exchanger, and transmission cooler line kits for selected GM transmissions.

Which Transmission Cooler Component Does Your Vehicle Need?

Start by identifying whether you need a cooler core, a direct replacement heat exchanger, or new transmission cooler lines. The universal 4, 6, and 8 pass tube and fin cooler kit includes a 5/16 inch ID hose and mounting components, but installation space, airflow, line size, and connection points must still be checked.

A vehicle specific replacement must match the model year, engine, and OE reference number. A line kit must match the exact transmission model, AN size, hose material, length, and planned routing. For additional hose sizes and replacement line options, compare the transmission cooler hoses.

Your Installation Need Evil Energy Option Confirm Before Ordering
Add an auxiliary cooler core Universal 4, 6, or 8 pass tube and fin transmission oil cooler kit Available mounting space, reliable airflow, 5/16 inch ID line connection, and hose routing
Replace a vehicle specific heat exchanger 2003–2009 Dodge Ram 2500/3500 5.9L L6 diesel heat exchanger Model year, engine, and OE numbers 68253200AA, 68004317AA, 5086946AA, or 5086946AB
Replace or reroute cooler lines Line kits for 4L80E, 4L60, 700R4, TH350, TH400, 4L60E, 4L65E, and selected 2001–2005 GM Duramax 6.6L LB7/LLY applications Exact transmission, fitting threads, AN size, hose length, bend clearance, and fluid compatibility

Build a Transmission Cooling System Around Airflow and Fitment

A transmission oil cooler works best where the core receives dependable airflow. Route every ATF line away from exhaust heat, sharp edges, and moving components, and avoid bends that restrict fluid flow. Follow the vehicle manufacturer’s requirements for fluid type, cooler routing, and towing limits. An auxiliary transmission cooler does not increase the vehicle’s tow rating or repair an existing transmission fault, fluid leak, or airflow problem. If the fluid you need to cool is engine oil rather than ATF, compare the dedicated engine oil cooler kits.

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EVIL ENERGY PTFE Hose End Fitting for PTFE Hose Only (3/4/6/8/10/12AN) - Black - EVILENERGY[Straight,1PC]
EVIL ENERGY PTFE Hose End Fitting for PTFE Hose Only (3/4/6/8/10/12AN) - Black

Engineered for high-pressure, high-temperature fuel systems, the EVIL ENERGY PTFE Hose End Fitting delivers leak-proof performance for PTFE fuel lines in performance builds, LS swaps, boosted engines, and ethanol-based fuel setups. Made from 6061-T6 aluminum with a 360° swivel design, these AN fittings ensure a clean, secure, and easy-to-assemble connection—ideal for builders who demand durability and precision.

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[Black,Without Bracket] black inline evil energy fuel filter with directional arrow and multiple AN fuel line fittingsevil energy fuel filter kit with stainless steel inline fuel filter, AN fittings, and mounting hardware
EVIL ENERGY Inline Fuel Filter with 6AN 8AN 10AN Adapter and Bracket Universal 10/30/40/100 Micron - Black

[Application] Universal fuel filter, includes an6, an8, an10 adapters for different size applications. With mounting bracket keeps the engine bar stylish and clean.

  • [Material] Aluminum alloy fuel filter can and stainless steel filter element.
  • [O-ring] The o-ring provides a tight seal for fittings and end caps.
  • [Function] Can be used for filtering gasoline, diesel, etc. Captures contaminant particles of 10 micron and above to protect the fuel system of the vehicle.
  • [Feature] Removable design, easy to clean or replace filter element at regular time.
  • [Installation Tips] We have debugged the installation direction of the fuel filters before delivery. Please check and ensure the closed end of the filter element docks with the spring. Let the liquid flow following the arrow from the spring end to the other end, and the fuel filter will serve longer.
$23.99
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[20FT] EVIL ENERGY PTFE Fuel Line Kit, complete black hose & fittings set, 180-day return[16FT] EVIL ENERGY PTFE Fuel Line Kit, black braided hose, fittings, free shipping & return
EVIL ENERGY 4/6/8/10AN PTFE Fuel Line Kit | E85 Nylon Braided Hose | 16/20FT Black Black with Comprehensive Fittings

Three-Layer Construction: Our fuel lines are constructed with a triple-layer material for unparalleled performance and protection. The innermost layer is made of PTFE for maximum chemical resistance, a braided stainless steel layer for strength and durability, and an outer nylon layer for added abrasion resistance and protection.

Multiple Sizes: We offer our fuel lines in 4AN, 6AN, 8AN, and 10AN sizes, catering to the diverse needs of various fuel delivery systems.

Fitting Types: Our kit includes a variety of fittings at 0°, 90°, 45°, and 180° angles, ensuring versatility and flexibility during installation, allowing for custom routing in tight or complex spaces.

Precision Fit and Leak-Free Performance: The combination of the PTFE inner layer and the high-quality aluminum hose ends ensures a precision fit and leak-free connection, even under extreme pressure, providing a safe and reliable fuel system.

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EVIL ENERGY AN Flare to AN ORB Male Fuel Rail Adapter Fitting
  • AN to ORB Conversion
    Converts AN flare fittings to ORB ports for fuel rails and aftermarket fuel components.
  • High Pressure Capability
    Rated up to 1500 PSI for reliable performance in fuel and oil systems.
  • Leak Free Sealing Design
    37 degree AN flare seal combined with ORB O ring ensures a secure, leak resistant connection.
  • CNC Machined Aluminum
    Made from 6061 T6 aluminum with black anodized finish for corrosion resistance.
  • Wide Size Availability
    Multiple AN sizes available to support custom fuel system layouts.
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  • [4 pass,Black][6 pass,Black]
    EVIL ENERGY 4/6/8 Pass Tube Transmission Oil Cooler Universal Kit - Black

    This comprehensive transmission oil cooler kit includes all essential components for efficient cooling and straightforward installation. It features a high-performance oil cooler, a versatile Insta-Dapt adapter, a durable 5/16" hose (5ft), four secure mounting rods, protective foam pads, reliable hose clamps, and practical mounting clips. The kit ensures easy installation, enhanced durability, and optimal transmission performance, helping to extend engine life by maintaining ideal oil temperatures.

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  • EVILENERGY EVIL ENERGY 6AN Rubber Transmission Cooler Line Kit 15FT for 4L60E 4L65E | NBR Inner Tube with Polyester Braid and CPE Cover, 3-Layer Reinforced Design for Oil Resistance, Flexibility & DurabilityEVILENERGY EVIL ENERGY 6AN Rubber Transmission Cooler Line Kit 15FT for 4L60E 4L65E | NBR Inner Tube with Polyester Braid and CPE Cover, 3-Layer Reinforced Design for Oil Resistance, Flexibility & Durability
    EVIL ENERGY 6AN Rubber Transmission Cooler Line Kit 15FT for 4L60E 4L65E | NBR Inner Tube with Polyester Braid and CPE Cover, 3-Layer Reinforced Design for Oil Resistance, Flexibility & Durability
    • Transmission Fitment: This transmission line is compatible with GM 4L60E and 4L65E transmissions, providing a reliable connection between the transmission and cooler for efficient fluid transfer. Please verify your transmission model before purchase
    • Hose Specifications: 6AN × 15FT, ID: 0.38" (9.7mm), OD: 0.65" (16.5mm), Max Working Pressure: 650 PSI, Burst Pressure: 1180 PSI, Temperature Range: -4°F to 212°F, Minimum Bend Radius: 2.6" (66mm)
    • 3-Layer Construction: Built with an NBR inner tube, braided polyester middle layer, and CPE rubber outer cover, this transmission cooler line delivers flexibility, durability, and resistance against oil, fluid, and abrasion
    • High Pressure Rating: The 6AN transmission line is rated for 650 PSI working pressure and 1180 PSI burst pressure, with reliable performance from -4°F to 212°F for dependable transmission cooling applications
    • Wide Fluid Compatibility: This transmission line supports transmission fluid, engine oil, gasoline, and diesel for versatile fluid transfer applications across multiple systems
    • Complete Kit Included: This transmission line kit includes a 15FT hose, swivel hose ends, and adapter fittings for convenient installation. Precision-machined components ensure secure connections and reliable performance
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  • EVILENERGY EVIL ENERGY 6AN CPE Transmission Cooler Line Kit 15FT for 4L80E Fuel Line | CPE Inner Tube with 304 Stainless Steel Braid and Nylon Cover, Design for High Pressure, Heat Resistance & DurabilityEVILENERGY EVIL ENERGY 6AN CPE Transmission Cooler Line Kit 15FT for 4L80E Fuel Line | CPE Inner Tube with 304 Stainless Steel Braid and Nylon Cover, Design for High Pressure, Heat Resistance & Durability
    EVIL ENERGY 6AN CPE Transmission Cooler Line Kit 15FT for 4L80E Fuel Line | CPE Inner Tube with 304 Stainless Steel Braid and Nylon Cover, Design for High Pressure, Heat Resistance & Durability
    • Transmission Fitment: This transmission line is compatible with 4L80E transmissions, providing a reliable connection between the transmission and cooler for efficient fluid transfer. Please verify your transmission model before purchase
    • Hose Specifications: 6AN × 15FT, ID: 0.31" (8mm), OD: 0.56" (14.3mm), Max Working Pressure: 750 PSI, Burst Pressure: 2250 PSI, Temperature Range: -22°F to 248°F, Minimum Bend Radius: 2.5" (63.5mm)
    • 3-Layer Construction: Built with a durable CPE inner tube, 304 stainless steel braid, and a braided nylon outer cover, the transmission cooler line is engineered for lasting durability. The reinforced construction provides excellent flexibility while helping resist abrasion and high-pressure operation
    • High Pressure Rating: The 6AN transmission line is rated for 750 PSI working pressure and 2250 PSI burst pressure to handle demanding applications. It performs reliably from -22°F to 248°F for dependable transmission cooling
    • Wide Fluid Compatibility: This transmission line is compatible with transmission fluid, engine oil, racing fuel, diesel, hydraulic oil, and power steering fluid for versatile fluid transfer applications. Not compatible with E85.
    • Complete Kit Included: The 4L80E transmission line kit includes a 15FT hose, swivel hose ends, and adapter fittings for a complete cooling system connection. Precision-machined components ensure secure fittings and reliable installation
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  • EVILENERGY EVIL ENERGY AN10 PTFE Transmission Line for GM Duramax 01-05 6.6L LB7 / LLY | PTFE Inner Tube with 304 Stainless Steel Braid and Nylon Cover, Design for Extreme Heat, Chemical Resistance & DurabilityEVILENERGY EVIL ENERGY AN10 PTFE Transmission Line for GM Duramax 01-05 6.6L LB7 / LLY | PTFE Inner Tube with 304 Stainless Steel Braid and Nylon Cover, Design for Extreme Heat, Chemical Resistance & Durability
    EVIL ENERGY AN10 PTFE Transmission Line for GM Duramax 01-05 6.6L LB7 / LLY | PTFE Inner Tube with 304 Stainless Steel Braid and Nylon Cover, Design for Extreme Heat, Chemical Resistance & Durability
    • Transmission Fitment: This transmission line is compatible with 2001-2005 GM Duramax 6.6L LB7/LLY transmissions, providing reliable fluid transfer between the transmission and cooler for efficient cooling performance. Please verify your transmission model before purchase
    • Hose Specifications: 10AN, ID: 0.52" (13.3mm), OD: 0.69" (17.5mm), Max Working Pressure: 1250 PSI, Burst Pressure: 3750 PSI, Temperature Range: -76°F to 446°F, Minimum Bend Radius: 4.5" (114.3mm).
    • 3-Layer Construction: Built with a PTFE inner tube, 304 stainless steel braid, and braided nylon outer cover, this transmission cooler line delivers excellent chemical resistance, heat resistance, flexibility, and long-lasting durability
    • High Pressure Rating: The AN10 transmission line is rated for 1250 PSI working pressure and 3750 PSI burst pressure, with reliable performance from -76°F to 446°F for demanding transmission cooling applications
    • Wide Fluid Compatibility: This transmission line supports transmission fluid, engine oil, E85, racing fuel, diesel, and hydraulic steering fluids for versatile fluid transfer applications
    • Complete Kit Included: The transmission line kit includes hose, swivel hose ends, and adapter fittings for a secure cooling system connection. Precision-machined components ensure reliable installation and performance
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  • EVILENERGY EVIL ENERGY 6AN PTFE Transmission Line Kit 7FT for 4L60 700R4 TH350 TH400 | PTFE Inner Tube with 304 Stainless Steel Braid and Nylon Cover, 3Design for High Heat, Chemical Resistance & DurabilityEVILENERGY EVIL ENERGY 6AN PTFE Transmission Line Kit 7FT for 4L60 700R4 TH350 TH400 | PTFE Inner Tube with 304 Stainless Steel Braid and Nylon Cover, 3Design for High Heat, Chemical Resistance & Durability
    EVIL ENERGY 6AN PTFE Transmission Line Kit 7FT for 4L60 700R4 TH350 TH400 | PTFE Inner Tube with 304 Stainless Steel Braid and Nylon Cover, 3Design for High Heat, Chemical Resistance & Durability
    • Transmission Fitment: This transmission line is compatible with 4L60, 700R4, TH350, and TH400 transmissions, providing reliable fluid transfer between the transmission and cooler for efficient cooling performance. Please verify your transmission model before purchase
    • Hose Specifications: 6AN × 7FT, ID: 0.31" (8mm), OD: 0.45" (11.5mm), Max Working Pressure: 1500 PSI, Burst Pressure: 4500 PSI, Temperature Range: -76°F to 446°F, Minimum Bend Radius: 3.5" (88.9mm).
    • 3-Layer Construction: Built with a PTFE inner tube, 304 stainless steel braid, and braided nylon outer cover, this transmission cooler line provides excellent chemical resistance, heat resistance, flexibility, and durability for demanding applications
    • High Pressure Rating: The 6AN transmission line is rated for 1500 PSI working pressure, and 4500 PSI burst pressure, with reliable performance from -76°F to 446°F for high-performance transmission cooling systems
    • Wide Fluid Compatibility: This transmission line supports transmission fluid, engine oil, E85, racing fuel, diesel, and hydraulic steering fluids for versatile fluid transfer applications
    • Complete Kit Included: The transmission line kit includes a 7FT hose, swivel hose ends, and adapter fittings for convenient installation. Precision-machined components ensure secure connections and reliable performance
    $38.99
    $38.99
    $38.99
    Out Of Stock
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  • EVIL ENERGY EVIL ENERGY Transmission Torque Converter Oil Cooler Compatible with 2003-2009 Dodge Ram 2500 3500 5.9L L6 Diesel 68004317AA 5086946AA Steel BracketEVIL ENERGY EVIL ENERGY Transmission Torque Converter Oil Cooler Compatible with 2003-2009 Dodge Ram 2500 3500 5.9L L6 Diesel 68004317AA 5086946AA Steel Bracket
    EVIL ENERGY Transmission Torque Converter Oil Cooler Compatible with 2003-2009 Dodge Ram 2500 3500 5.9L L6 Diesel 68004317AA 5086946AA Steel Bracket

    If you drive a 2003‑2009 Dodge Ram 2500/3500 with the 5.9L Cummins turbo‑diesel, your factory transmission cooler is prone to failure. Its plastic end‑tank cracks over time from repeated heat cycles, which can cause coolant to leak into transmission fluid and lead to costly transmission damage.

    Our EVIL ENERGY transmission torque converter oil cooler is a direct bolt‑on replacement. Constructed with durable aluminum and brass components rather than plastic, it stands up to high heat, pressure and engine vibration for long‑term reliability, whether you tow heavy loads or drive daily.

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FAQs about Transmission Oil Cooler

What does a transmission oil cooler do?

A transmission cooler operates like a heat exchanger mounted adjacent to your car's radiator. Hot transmission fluid flows through the unit and comes in contact with a series of fins or plates. The resulting heat dissipation cools the liquid as it cycles back into the transmission.

Start with the exact model year, engine, and automatic transmission model. Then determine whether you need a universal transmission cooler, a direct replacement heat exchanger, or only a transmission cooler line kit.

For a universal cooler, confirm:

  • The cooler dimensions fit in the available mounting area
  • The selected location receives dependable airflow
  • The hose ID and cooler connections match the existing system
  • The supplied hose length supports safe routing
  • The product is suitable for the vehicle manufacturer’s specified transmission fluid

For a direct replacement unit, match the OE reference number rather than relying only on the vehicle name. “Universal” does not mean installation is confirmed for every vehicle.

A transmission cooler with fan is most useful when the cooler must be mounted away from strong grille airflow or when the vehicle spends substantial time moving slowly under load. The fan provides airflow at low vehicle speed, but it does not replace the need to select the correct cooler dimensions, fluid connections, and installation location.

The Evil Energy universal 4, 6, and 8 pass tube and fin cooler kit does not include an electric fan. If your installation depends on forced airflow, choose a fan equipped product whose listing confirms the fan dimensions, airflow rating, electrical draw, mounting direction, and control method.

Choose a transmission oil cooler when the project requires an additional heat exchanger or a replacement cooler core. Choose a transmission cooler line kit when the existing lines leak, are damaged, are the wrong length, or do not match the planned cooler and fittings.

A line kit transfers ATF between the transmission and cooler, but the hose itself does not add the cooling surface of a cooler core. Some builds need both components, especially when adding a universal cooler and replacing the original line routing. Always verify the product’s included fittings before assuming the cooler and line kit connect directly.

A capable DIY installer may be able to install a universal transmission oil cooler after correctly identifying the cooler lines, confirming the return path, securing the core, routing the hose, and refilling the system with the specified ATF.

  • Professional installation is the safer choice when:
  • The transmission ports require unfamiliar adapters
  • The cooler is being integrated with an electronic fan or thermostat
  • The installation requires drilling near the radiator or A/C condenser
  • The existing lines are corroded or difficult to identify
  • You cannot confirm the correct fluid path or final ATF level

After installation, inspect every connection for leaks with the vehicle running, then recheck the fluid level using the vehicle manufacturer’s specified procedure.

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