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If you tow regularly or drive in hot conditions with a 2010-2018 Ram 2500, keeping transmission fluid cool pays real dividends in longevity and shift quality. A properly selected transmission cooler reduces operating temperature, helps protect seals and clutch packs, and can prevent premature fluid breakdown when hauling heavy loads.This guide presents five shortlisted transmission coolers chosen for the Ram 2500 range. We evaluate compatibility, cooling capacity, and installation practicality so you can pick a solution that matches your towing frequency, payloads, and whether you prefer an integrated or externally mounted cooler. Read on to understand the tradeoffs and which features matter most for your truck.
Looking for other parts? See all Ram 2500 parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Mishimoto Transmission Cooler for Ram 2500/3500 6.7L (2010–2012) |  |
| Best Value The sweet spot between price and what you get | A-Premium Transmission Oil Cooler for Ram 2500/3500/4500/5500 6.7L (2013–2018) |  |
| Best Budget The cheapest option that still gets the job done reliably | KarParts360 Transmission Oil Cooler for Ram 2500/3500 (6.7L) — Front Mount |  |
| Highest Rated A top-rated pick with lots of positive feedback | TRQ Radiator Assembly with Integrated Transmission Oil Cooler for 2013–2018 Ram 2500/3500/4500/5500 6.7L Diesel |  |
| Most Popular A crowd favorite that many people choose with confidence | Mishimoto Transmission Cooler for Ram 6.7L Cummins (2015–2018) |  |
1. Mishimoto Transmission Cooler for Ram 2500/3500 6.7L (2010–2012)
| Fitment | 2010–2012 Ram 2500/3500 6.7L Cummins |
|---|---|
| Core increase | 60% core volume |
| Fin area increase | 86% external fin area |
| Design | Tube-and-fin aluminum |
This Mishimoto transmission cooler is a direct-fit upgrade for 2010–2012 Ram 2500/3500 trucks with the 6.7L Cummins, built to lower transmission fluid temperatures during heavy towing and abrupt load changes. It uses a tube-and-fin aluminum core and increases core volume by 60% plus external fin area by 86%, which translates to faster heat dissipation and better protection for the transmission under repeated high-load use. Installation is intended to be straightforward and clean since the unit is made for stock fitment, and Mishimoto offers an optional line kit to bypass the factory cooler if needed. The metal construction and machined finish look durable and serviceable for frequent towing duty. The main trade-offs are that it is targeted to the 2010–2012 6.7L Cummins Ram trucks only and will require the optional line kit for systems that need bypass capability, adding to total cost and install steps for some setups.
Best for: Buyers who want a dependable, factory-style cooling upgrade to protect the transmission during regular towing and heavy-duty use on 2010–2012 Ram 2500/3500 trucks.
Less Ideal for: Drivers who need a universal or multi-vehicle solution, or who do not tow regularly and prefer to keep the factory cooling capacity unchanged.
- Direct-fit design for 2010–2012 Ram 2500/3500 6.7L Cummins for easier installation
- Significantly larger core volume and fin area for improved heat rejection during towing
- Aluminum tube-and-fin construction offers good durability and corrosion resistance
- Compatible with stock coolers and an optional bypass line kit for more flexible system setups
- Fitment limited to 2010–2012 Ram 2500/3500 6.7L Cummins models only
- Optional line kit required to bypass factory cooler which is sold separately
Verdict: For 2010–2012 Ram 2500/3500 6.7L Cummins owners who tow regularly, this Mishimoto cooler delivers a clear factory-fit upgrade in cooling performance to reduce transmission heat under load.
2. A-Premium Transmission Oil Cooler for Ram 2500/3500/4500/5500 6.7L (2013–2018)
| Vehicle fitment | Ram 2500/3500/4500/5500 2013-2018 L6 6.7L |
|---|---|
| Material | Aluminum |
| Manufacturer part number | APOC162 |
| OEM reference numbers | 918-517, 918517, 19075, 52014715AA |
This A-Premium transmission oil cooler is a direct-fit replacement specified for 2013–2018 Ram 2500/3500/4500/5500 trucks with the 6.7L engine and is intended to lower transmission oil temperature during towing and heavy use. Constructed from aluminum, the cooler uses a multi-row core to increase surface area for heat dissipation and mounts in the factory location to maintain routing and connections. In typical use it helps keep oil temperatures down under load, which reduces wear on the transmission and improves fluid life when towing or driving in hot conditions. Notable features include several factory reference numbers for cross-checking fit and a one-year unlimited-mileage guarantee from the brand. Practical limitations are that installation may require verifying exact vehicle compatibility before purchase and that the product does not list bundled fittings or hoses, so you may need to reuse or buy adapters separately. For someone who prioritizes keeping transmission temps in check on a working Ram, this cooler offers a straightforward, lightweight aluminum replacement option.
Best for: Buyers who want a practical, vehicle-specific transmission cooler to reduce oil temperatures while towing or working their Ram and who prefer a direct-fit aluminum replacement rather than a custom setup.
Less Ideal for: Drivers looking for a complete heavy-duty kit with aftermarket adapters, hoses, or advanced multi-core performance beyond a straightforward replacement should consider more fully featured options.
- Aluminum construction for effective heat conduction and corrosion resistance
- Designed to fit 2013–2018 Ram 2500/3500/4500/5500 6.7L trucks for direct replacement mounting
- Multi-row core increases cooling surface to lower transmission oil temperatures during heavy loads
- Includes manufacturer reference numbers to confirm compatibility with factory parts
- Mounting kit details and included fittings are not specified so additional hardware may be required
- Limited brand warranty information beyond a one-year guarantee is provided
Verdict: A straightforward aluminum direct-fit transmission cooler for 2013–2018 Ram 6.7L trucks that helps control oil temps during towing and heavy use.
3. KarParts360 Transmission Oil Cooler for Ram 2500/3500 (6.7L) — Front Mount
| Manufacturer | KarParts360 |
|---|---|
| Model | 2500 |
| OEM Part Number | 52014715AA |
| Partslink Number | CH4050142 |
| Safety Rating | DOT Certified |
This KarParts360 transmission oil cooler is a direct aftermarket replacement intended to restore transmission cooling on compatible Ram 2500/3500 6.7L trucks. It installs in the front position and is built from durable materials to match the fit and function of the original cooler. Typical use is to replace a leaking or clogged factory cooler or to maintain transmission temperatures during towing and heavy-duty driving. The unit is DOT and SAE compliant and comes factory sealed, so buyers can expect a ready-to-install part that aims for OEM-style performance without the OEM badge. Because it is an aftermarket component, confirm the OEM or partslink number before ordering to ensure fitment; professional or experienced DIY installation is recommended due to routing and mounting considerations. For budget-minded owners needing a reliable replacement cooler that mirrors factory specifications, this offers solid value, though it is not from the vehicle manufacturer.
Best for: Owners looking to replace a failing transmission cooler or maintain towing performance on a tight budget who want a direct-fit aftermarket option that aims to match factory performance.
Less Ideal for: Buyers seeking a performance upgrade or heavy-duty aftermarket cooler designed for extreme towing should consider purpose-built high-capacity coolers instead.
- Designed as a direct replacement to match original component fit and function
- DOT and SAE compliant for regulatory safety standards
- Factory sealed new-in-box unit for immediate installation
- Constructed from durable materials intended for long-lasting use
- Aftermarket part not manufactured by the vehicle maker, so quality can vary from factory parts
Verdict: A cost-conscious, direct-fit replacement that restores transmission cooling for 2010–2018 Ram 2500/3500 6.7L trucks without the OEM price.
4. TRQ Radiator Assembly with Integrated Transmission Oil Cooler for 2013–2018 Ram 2500/3500/4500/5500 6.7L Diesel
| Fitment | 2013–2018 Ram 2500/3500/4500/5500 L6 6.7L Diesel |
|---|---|
| Core Material | Aluminum |
| Core Thickness | 1.75 in |
| Core Row Quantity | 2 |
| Transmission Oil Cooler | Plated, internal, included |
This TRQ radiator assembly replaces the factory unit and includes an internal plated transmission oil cooler for trucks with the 6.7L Cummins diesel from 2013 through 2018. It is a cross-flow aluminum core with two core rows and a 1.75 inch core thickness, built as a direct-fit replacement with plastic tanks and factory-style mounting locations. In practice it looks and installs like a stock radiator and is intended for routine repair or replacement after a failure or coolant leak. The included transmission cooler plates add an integrated solution for automatic transmissions without separate cooler plumbing. Notable practical benefits are simplified installation from preassembled fitment, aluminum core heat transfer, and a multi-plate transmission cooler to help manage transmission temps. Important limitations are the plastic end tanks and the absence of a radiator cap or internal engine oil cooler, which may be considerations for heavy towing or extreme-duty use where a fully metal tank design or standalone high-capacity transmission cooler might be preferable.
Best for: Drivers who prioritize a reliable, ready-to-install replacement that restores factory cooling and reduces downtime after a failed radiator or leak, especially those who value easy installation and integrated transmission cooling.
Less Ideal for: Owners who run sustained heavy towing, severe-duty offroad, or demand the highest endurance components should consider heavy-duty standalone coolers or radiators with full-metal tanks instead.
- Direct-fit replacement built to match factory mounting and fitment for 2013–2018 Ram 2500/3500/4500/5500 6.7L diesel
- Aluminum cross-flow core for effective heat transfer
- Integrated transmission oil cooler with multiple plated plates for added transmission cooling
- Preassembled unit simplifies DIY or shop installation
- Plastic end tanks rather than full-metal tanks can be less durable under extreme heat or long-term heavy towing
Verdict: Choose this radiator for a dependable, factory-style direct replacement that restores engine and transmission cooling with minimal fuss.
5. Mishimoto Transmission Cooler for Ram 6.7L Cummins (2015–2018)
| Compatible vehicles | 2015–2018 Ram 2500/3500 6.7L Cummins |
|---|---|
| Core type | Tube-and-fin with internal fins |
| Fluid capacity | .767 qts |
| Construction | CNC‑machined aluminum, powder‑coat finish |
| Includes | Fittings and mounting hardware |
The Mishimoto MMTC‑RAM‑15SL is a direct‑fit transmission cooler built to reduce fluid temperatures during towing and heavy loads on 2015–2018 Ram 6.7L Cummins trucks. It uses a tube‑and‑fin core with internal fins and a much larger core and fin area than the factory cooler, which improves heat dissipation and keeps fluid more stable under prolonged strain. Constructed from CNC‑machined aluminum with precision welds and a powder‑coat finish, the cooler resists corrosion and thermal cycling for long service life. The kit includes fittings and mounting hardware for a no‑cut installation, so it can replace the factory unit without fabrication. Because it increases fluid capacity and cooling surface, drivers should notice cooler transmission temps and firmer shifts when towing or hauling heavy loads. The main limitations are that it is specific to the 6.7L Cummins Ram trucks and adds aftermarket hardware that may change routing compared with the factory part, so professional installation is recommended if you are not comfortable working under the truck.
Best for: Buyers who prioritize proven performance and reduced transmission temperatures while towing heavy loads and want a ready-to-install, durable upgrade backed by manufacturer credibility.
Less Ideal for: Drivers who rarely tow or haul and prefer to keep a fully stock cooling system, or those seeking a universal cooler for multiple vehicles.
- Direct OEM-style fit for 2015–2018 Ram 2500/3500 6.7L Cummins for straightforward replacement
- Significantly larger core and fin area for improved heat dissipation under towing and heavy loads
- CNC‑machined aluminum construction with powder‑coat finish and strong welds for corrosion resistance
- Includes fittings and mounting hardware to allow installation without cutting or extra parts
- Vehicle-specific fitment limits use to the 2015–2018 6.7L Cummins Rams only
- Larger aftermarket cooler can require careful routing and space checking during install
Verdict: If you tow or haul frequently with a 2015–2018 Ram 6.7L Cummins, this direct‑fit Mishimoto cooler is a durable, proven way to cut transmission temperatures and protect drivetrain components.
Choosing the Right 2010-2018 Ram 2500 Transmission Cooler: Key Factors to Consider
Cooling Capacity and Thermal Efficiency
How much heat a cooler can shed under sustained load directly affects transmission life and performance. Cooling capacity is often expressed as a temperature drop or as the cooler's ability to maintain safe fluid temperatures during prolonged towing. For a 2010-2018 Ram 2500 that tows heavy trailers, you want a cooler with a core design and fin density that dissipates heat efficiently without creating excessive fluid pressure drop.
Higher efficiency cores often use multiple rows and brazed-aluminum construction to maximize heat transfer while resisting leaks. Consider the expected towing weight, ambient temperatures where you operate, and whether you will be using the truck for repeated long climbs. A cooler that reduces transmission fluid temperature by a measurable margin under load will slow fluid oxidation and help keep valve bodies and clutch packs functioning reliably over time.
Fitment and Compatibility With Ram 2500
Correct fitment to the 2010-2018 Ram 2500 is essential to avoid routing problems, clearance issues, or interference with cooling components. Confirm the cooler's dimensions, inlet and outlet locations, and whether the kit includes fittings that match your truck's transmission port sizes. Some coolers are vehicle-specific while others use universal mounting that requires additional brackets or line adapters.
Poor fitment can lead to strained transmission cooler lines or contact with the radiator or AC condenser, increasing failure risk. For practical installation and reliable performance, choose a cooler whose mounting options and hose adaptors suit the Ram 2500 frame layout and front-end architecture for the given years.
Core Type and Construction Quality
Core design and the materials used determine durability and resistance to damage. Brazed-aluminum cores tend to offer superior thermal conductivity and leak resistance compared with stacked-plate or tube-and-fin designs used in lower-cost units. Look for coolers with reinforced end tanks, quality welds or brazing, and corrosion-resistant finishes.
Robust construction matters for trucks that see off-road ruts, road debris, and heavy-duty cycles. A cooler with thicker fins and protective screening can survive stone strikes better and maintain effective heat transfer longer. Also inspect hose barb and fitting quality; soft or undersized fittings are a common weak point that can cause leaks under pressure and elevated temperatures.
Installation Complexity and Included Hardware
Installation ease affects whether you can fit a cooler yourself or need a professional. Kits that include transmission cooler lines sized for the Ram 2500, mounting brackets, and clear instructions reduce labor and the risk of incorrect installation. Some systems require adding a dedicated transmission cooler loop with specific hose routing to avoid heat soak from the radiator or engine bay.
Consider how the cooler mounts to the truck's front end and whether it obstructs airflow to the radiator or AC condenser. If you plan a DIY install, choose a kit that minimizes custom cutting, flaring, or adapter fabrication. For shop installs, ensure the kit's components are compatible with common shop tools and that replacement parts are available.
Serviceability and Long-Term Maintenance
Transmission coolers are not maintenance-free components. Over time, fins can clog with debris, lines can develop leaks, and fittings can corrode. Select a cooler that is easy to inspect, clean, and repair on the Ram 2500. Features like accessible mounting, replaceable hoses, and clearances that allow a shop to service the unit without major disassembly are valuable.
Evaluate the availability of replacement lines and mounting hardware and whether the core can be flushed if contaminated. A cooler that simplifies periodic inspection and service reduces life-cycle cost and minimizes downtime for a truck used for regular towing.
Fluid Flow and Pressure Drop
A high-efficiency cooler is only useful if it does not create excessive pressure drop that impairs transmission fluid flow. The internal passages, hose diameters, and fittings all contribute to how easily fluid circulates through the cooler. For the Ram 2500, preserving proper flow ensures the transmission receives an adequate supply of cooled fluid at all times, especially during low-speed towing.
Consider matching the cooler to existing transmission pump characteristics and avoid undersized cooler lines. Some installations use a larger-diameter line or a dual-pass design to balance cooling with minimal pressure loss. Ensuring correct flow reduces the risk of overheating localized components and keeps hydraulic actuation predictable under load.
Types of Transmission Coolers and When to Use Them
Transmission coolers come in several common formats, each suited to different use cases on the Ram 2500. Single-pass tube-and-fin coolers are compact and work well for moderate towing, while multi-row or stacked-plate heat exchangers offer higher capacity for frequent heavy towing.
External coolers mount in front of the radiator or intercooler to access maximum airflow. Some systems add a separate transmission fluid cooler that sits low in the grille area for better heat rejection during sustained highway towing or hill climbs.
- Single-row tube-and-fin: good for light to moderate towing with minimal installation complexity.
- Multi-row or stacked-plate: better for heavy or frequent towing where larger temperature drops are needed.
- Integrated radiator or auxiliary coolers: useful when space is constrained but require careful fitment to avoid interference.
Understanding Cooling Ratings and Real-World Performance
Manufacturers publish different metrics such as temperature drop under standardized conditions, core area, and number of rows. These numbers can help you compare theoretical performance, but real-world results depend on airflow, mounting location, and towing load.
On a Ram 2500, expect larger cores and multi-pass designs to hold lower fluid temperatures during extended heavy towing. Pay attention to test conditions when comparing claims and prioritize units with independent thermal data or user feedback specific to similar towing scenarios.
- Look for quoted temperature delta when towing at highway speed with a specified heat load.
- Consider whether the cooler was tested for repeated heavy cycles, not just short bursts.
Routing and Protecting Transmission Cooler Lines
Line routing is a practical area many owners overlook. Cooler lines must be routed away from hot exhaust components, sharp edges, and pinch points. Use protective sleeves where lines pass close to frame sections or suspension components to prevent abrasion.
Properly secured lines reduce vibration and the chance of chafing that leads to leaks. On the Ram 2500, maintain clearance from steering linkages and ensure lines are long enough to accommodate full suspension travel without stretch.
- Use clamps and brackets to secure lines at regular intervals.
- Inspect line fittings periodically for signs of seepage or corrosion.
When to Add a Transmission Cooler to a Ram 2500
If you tow heavier-than-stock loads, frequently operate in high ambient temperatures, or notice high transmission operating temps during climbs, adding an auxiliary cooler is a sensible preventive step. Trucks used for commercial hauling or repeated towing benefit most from upgraded cooling.
Smaller improvements can also help: replacing aging hoses, ensuring the factory cooler is unobstructed, and checking fluid condition are effective first steps before committing to a larger cooler installation.
- Consider an auxiliary cooler if you routinely tow near the truck's maximum trailer rating.
- Install a cooler sooner rather than after signs of overheating to avoid costly transmission damage.
DIY Versus Professional Installation Considerations
Many owners can install a transmission cooler with basic mechanical skills if the kit is complete and truck access is good. DIY installation saves labor but requires familiarity with fluid handling, proper bleeding, and secure line fittings.
Professional installation is advisable when the kit lacks vehicle-specific fittings, when modifications are needed to mounting points, or when you prefer a warranty-backed fitment. Shops can also pressure-test the circuit and verify there are no leaks under load.
- DIY pros should prepare a clean work area, proper fluid catch containers, and torque specifications for fittings.
- A shop install is worth considering for complex front-end disassembly or when routing lines through tight engine-bay areas.
Still looking for the perfect fit?
Select your Ram 2500 configuration to see the most relevant Transmission Coolers recommendations
How We Chose the Best 2010-2018 Ram 2500 Transmission Cooler
We used a practical, vehicle-focused editorial process to narrow potential transmission coolers to the five finalists for the 2010-2018 Ram 2500. Our evaluation emphasized cooling performance under load, fitment and compatibility with Dodge Ram transmissions in the specified years, and durability for heavy-duty use. We prioritized units that offer measurable temperature delta improvements, robust materials and brazed or welded cores, and corrosion-resistant fins and end tanks suited to road salt and debris exposure.Installation characteristics were a key filter. We assessed how complete a transmission cooler kit is, whether it includes properly sized transmission cooler lines and fittings, and the availability of clear instructions for do-it-yourself installation or straightforward shop fitment. Noise, airflow interference, and mounting options were considered to avoid units that complicate installation or risk radiator/AC condenser contact.We excluded products that lacked vehicle-specific fitment guidance for the Ram 2500, had insufficient cooling specifications, or showed weak build quality in materials and fittings. Final selection balanced real-world cooling needs for towing and heavy use with installability and long-term reliability.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I know if my Ram 2500 needs an auxiliary transmission cooler?
You often need added cooling if transmission temperatures run high during towing, you tow frequently at heavy weights, or you notice early clutch slipping or rough shifting. Monitoring transmission temperature during a typical tow cycle gives the clearest indication.
Can I install a transmission cooler myself on a 2010-2018 Ram 2500?
Many owners can handle installation if the kit includes vehicle-specific lines and clear instructions. DIY installation requires care with fluid handling, proper line routing, and leak checking. If the kit requires custom brackets or line adapters, professional installation is recommended.
Will adding a cooler change transmission fluid flow or pressure?
Adding a properly sized cooler typically has minimal impact on flow if hose diameters and fittings match the transmission's specifications. Oversized or poorly designed cores can increase pressure drop, so select a cooler designed for truck use and verify hose sizing to avoid restricting flow.
Where is the best place to mount an external cooler on the Ram 2500?
Mount an external cooler where it receives unrestricted airflow, usually in front of the radiator or low in the grille area, while ensuring it does not contact the radiator or AC condenser. Maintain clearance for debris protection and ease of service.
How often should I inspect or service an auxiliary transmission cooler?
Inspect the cooler and lines at least twice a year and after off-road use or stone strikes. Check for bent fins, leaks, and damaged fittings, and flush or replace hoses if you notice contamination or reduced flow.
What are common signs of transmission cooler failure symptoms?
Common symptoms include rising transmission temperatures, visible fluid leaks at fittings or lines, and degraded shift quality. If you detect fluid on the front of the truck or a persistent temperature increase under similar loads, inspect the cooler and lines promptly.
Final Verdict
For the 2010-2018 Ram 2500, prioritize a transmission cooler that balances measured cooling capacity with straightforward fitment and durable construction. If you tow frequently or haul heavy loads, choose a multi-row or high-efficiency heat exchanger with robust fittings and clear routing options to protect against overheating.Weigh the tradeoffs between maximum thermal performance and installation complexity. Opt for a solution that matches your typical towing profile, offers accessible serviceability, and maintains proper fluid flow to keep your transmission operating reliably under sustained load.
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