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If you tow heavy loads or run your Ram 3500 in hot climates you already know how hard the transmission can work. A dedicated transmission cooler helps manage fluid temperatures, reduce thermal breakdown, and prolong the life of the transmission and torque converter.This guide covers the top six transmission coolers chosen for the 2010-2018 Ram 3500. Each shortlisted option was evaluated for cooling capacity, vehicle-specific fitment, installation practicality, and durability under towing conditions. Read on for what mattered in our selection and practical advice for installation and upkeep.
Looking for other parts? See all Ram 3500 parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Mishimoto Transmission Cooler for 2010–2012 Ram 2500/3500 6.7L Cummins |  |
| Best Quality Built to a higher standard if you want something more solid | Mishimoto MMTC-RAM-15SL Transmission Cooler for 2015–2018 Ram 6.7L Cummins |  |
| Best Value The sweet spot between price and what you get | Cooling Direct Transmission Oil Cooler for 2013–2018 Ram 2500/3500 6.7L (52014715AA fit) |  |
| Best Budget The cheapest option that still gets the job done reliably | A-Premium Transmission Oil Cooler for Ram 2500/3500/4500/5500 (2013–2018) 6.7L |  |
| Highest Rated A top-rated pick with lots of positive feedback | KarParts360 Transmission Oil Cooler for Ram 2500/3500 (6.7L) |  |
| Most Popular A crowd favorite that many people choose with confidence | TRQ Radiator Assembly with Transmission Oil Cooler for 2013–2018 Ram 2500/3500/4500/5500 6.7L Diesel |  |
1. Mishimoto Transmission Cooler for 2010–2012 Ram 2500/3500 6.7L Cummins
| Fitment | Direct fit for 2010–2012 Dodge Ram 2500/3500 6.7L Cummins |
|---|---|
| Design | Tube-and-fin aluminum core |
| Core volume increase | 60% increase |
| Fin area increase | 86% increase |
| Included components | Transmission Cooler |
This Mishimoto transmission cooler replaces the factory unit on 2010–2012 Ram 2500/3500 trucks with the 6.7L Cummins and installs as a direct-fit. It uses a tube-and-fin aluminum core that boosts core volume by about 60 percent and increases external fin area by about 86 percent, which helps the trans fluid shed heat more quickly during heavy towing or repeated high-load shifts. The cooler works with the vehicle’s stock cooler or as an upgraded stand-alone unit when paired with Mishimoto’s optional bypass line kit to avoid contaminating the new cooler. In practice that means steadier transmission temperatures under trailering or commercial use, reduced thermal stress on fluid and components, and potentially longer transmission life. Installation is straightforward for a DIYer familiar with a moderate level of mechanical work, though the optional line kit is recommended if you want to bypass the factory cooler. It is a purpose-built upgrade, so buyers should plan for a professional install if they are uncomfortable with fluid lines and fittings.
Best for: Truck owners who tow frequently or use their Ram for heavy-duty work and want a reliable, bolt-in transmission cooling upgrade to keep operating temperatures under control.
Less Ideal for: Casual drivers who rarely tow or those unwilling to disconnect transmission lines for installation should consider simpler maintenance options instead.
- Direct-fit design for the 2010–2012 Ram 2500/3500 6.7L Cummins simplifies installation
- Significantly larger core volume and fin area improve cooling under heavy towing
- Aluminum tube-and-fin construction offers durable, factory-quality heat transfer
- Compatible with the stock cooler and can work with an optional bypass line kit
- Requires removal and reconnection of transmission lines so professional installation may be preferable
Verdict: Choose this Mishimoto cooler when you need a reliable, direct-fit upgrade that noticeably improves transmission cooling for heavy towing and repeated high-load use.
2. Mishimoto MMTC-RAM-15SL Transmission Cooler for 2015–2018 Ram 6.7L Cummins
| Compatible vehicle | 2015–2018 Ram 6.7L Cummins |
|---|---|
| Core size | 24.76" x 11.85" x 1.25" |
| Fluid capacity | .767 qts |
| Construction | CNC‑machined aluminum, powder-coated |
The Mishimoto MMTC-RAM-15SL is a direct-fit transmission cooler built to manage the high heat loads produced by towing and heavy-duty driving in 2015–2018 Ram 6.7L Cummins trucks. It uses a tube-and-fin core with internal fins to increase core volume, fin surface area, and fluid capacity well beyond the stock cooler, which helps it move heat away from fluid faster and stabilizes transmission temperatures under sustained load. Constructed from CNC-machined aluminum with precision welds and a powder-coated finish, the cooler resists corrosion and thermal cycling for long-term durability. The kit includes fittings and mounting hardware for a no-modification install, so it installs like a factory replacement. Practical benefits include cooler fluid for smoother shifts, reduced wear on valve bodies and clutches when towing, and confidence on long hauls. The unit is focused on cooling performance rather than compact packaging, so expect a larger core profile compared with stock and plan routing and clearance accordingly during installation.
Best for: Drivers who regularly tow or haul heavy loads and prioritize transmission temperature control and long-term drivetrain protection.
Less Ideal for: Casual drivers who never tow heavy loads and want to avoid potential fitment checks or those seeking the smallest possible cooler for tight engine bays.
- Direct-fit design with included fittings and mounting hardware for straightforward installation
- Tube-and-fin core with internal fins provides substantially more core volume and fin surface for improved heat dissipation
- CNC-machined aluminum construction and powder-coat finish resist corrosion and thermal fatigue
- Designed specifically for 2015–2018 Ram 6.7L Cummins so no trimming or extra parts required
- Larger core profile than stock may require attention to routing and clearance during installation
Verdict: If you tow or haul with a 2015–2018 Ram 6.7L Cummins and want a straightforward, high-capacity upgrade to keep transmission temperatures down, this Mishimoto cooler is a purpose-built choice.
3. Cooling Direct Transmission Oil Cooler for 2013–2018 Ram 2500/3500 6.7L (52014715AA fit)
| Manufacturer Part Number | CDOC153 |
|---|---|
| OEM Part Number | 52014715AA |
| Core Dimensions (inches) | 24.53 x 10.01 x 10.01 |
| Manufacturer | Cooling Direct |
| Customer Reviews | 4.7 out of 5 stars |
This Cooling Direct transmission oil cooler is a drop-in replacement built to match the factory fit and performance for 2013–2018 Ram 2500/3500 6.7L trucks. It installs in the factory location and is used to maintain transmission fluid temperatures under towing or heavy-load conditions; Cooling Direct says the core and overall dimensions align with the referenced OEM part number. The cooler is marketed as vehicle tested and designed to factory standards, which should simplify installation and reduce the need for modification. Practical benefits include direct-fit compatibility, a full core sized to the listed dimensions that helps dissipate heat during extended towing, and a one-year manufacturer warranty for peace of mind. Limitations are that fitment should be verified with your VIN before purchase and the listing does not include hoses or fittings, so some installs may require transfer of existing hardware or additional parts. There is also only a one-year warranty rather than a longer coverage period.
Best for: Buyers who prioritize a practical, factory-style replacement for towing-capable Ram 2500/3500 trucks and want a cooler that installs without custom modification.
Less Ideal for: If you need a high-capacity aftermarket cooler for extreme race or commercial continuous-duty use, choose a purpose-built heavy-duty cooler instead.
- Drop-in replacement built to match the referenced factory part number for straightforward installation
- Core sized to provide increased fluid cooling during towing and heavy loads
- Manufactured to OEM standards for fitment and performance
- Vehicle-tested fitment claim reduces likelihood of modification during installation
- Fitment verification via VIN is required because the listing asks buyers to confirm compatibility
- Hoses and fittings are not listed as included, so additional parts may be needed for some installs
Verdict: A practical, factory-fit replacement cooler that restores OEM-style cooling for 2013–2018 Ram 2500/3500 6.7L trucks and simplifies installation for towing owners.
4. A-Premium Transmission Oil Cooler for Ram 2500/3500/4500/5500 (2013–2018) 6.7L
| Vehicle fitment | Ram 2500/3500/4500/5500 2013-2018 L6 6.7L |
|---|---|
| Material | Aluminum |
| Reference numbers | 918-517, 918517, 19075, 52014715AA |
| Manufacturer part number | APOC162 |
This A-Premium transmission oil cooler is a direct-fit replacement designed to reduce transmission oil temperatures on 2013–2018 Ram 2500/3500/4500/5500 trucks with the 6.7L diesel. Constructed from aluminum, it uses a multi-row fin design to increase surface area for faster heat dissipation and mounts in the factory location for straightforward installation. In daily use it helps the transmission run cooler during towing or heavy loads, which can preserve clutch packs and transmission longevity. The unit lists multiple OEM reference numbers so it is easy to verify compatibility before buying. Practical benefits include lighter weight than steel alternatives and a one-year unlimited-mileage guarantee that adds some buyer confidence. Limitations to consider are that this is an aftermarket part from a third-party brand rather than a factory component and fitment should be confirmed against the vehicle reference numbers; some installers may prefer a brand with longer-term track record or extended warranty for heavy commercial use.
Best for: Buyers looking to replace a damaged or aging transmission cooler on a budget who need a straightforward, direct-fit unit for 2013–2018 6.7L Ram trucks and want reasonable cooling performance without premium pricing.
Less Ideal for: Owners who need an upgraded high-capacity cooler for extreme commercial towing or who prioritize long-term warranty support and brand history should consider heavy-duty or OEM options instead.
- Direct-fit design for 2013–2018 Ram 6.7L trucks simplifies installation
- Aluminum construction and multi-row fins improve heat dissipation compared with basic coolers
- Includes common OEM reference numbers to help confirm fitment
- One-year unlimited-mileage guarantee provides short-term assurance
- Offered by an aftermarket brand rather than the factory manufacturer
Verdict: A cost-conscious direct-fit aluminum transmission cooler that restores factory-style cooling for 2013–2018 Ram 6.7L trucks without a premium price.
5. KarParts360 Transmission Oil Cooler for Ram 2500/3500 (6.7L)
| Manufacturer Part Number | CLX-M0-19075-CL360A55 |
|---|---|
| OEM Part Number | 52014715AA |
| ABPA Partslink Number | CH4050142 |
| Position | Front |
| Safety Rating | DOT Certified |
This KarParts360 transmission oil cooler is a vehicle-specific aftermarket replacement built to match the original component’s fit and function for many Ram 2500/3500 6.7L models. It mounts in front and provides a dedicated heat-exchange path to lower transmission fluid temperature during towing and heavy-load driving. The unit is DOT and SAE compliant and is described as manufactured from durable materials and factory-sealed new in box. In practical use it should help reduce overheating and extend transmission life under normal and moderate heavy-duty use, and it installs as a direct replacement when the OEM or partslink numbers match. Expect straightforward swap-in installation for technicians or experienced DIYers, but note this is an aftermarket part rather than a factory-manufactured assembly, so fitment must be confirmed by matching the OEM or Partslink number. The cooler is best for restoring cooling performance on trucks used for towing or frequent heavy loads where maintaining transmission temperature is a priority.
Best for: Buyers who prioritize long-term transmission reliability on heavy-use Ram 2500/3500 trucks and want a direct-replacement cooler to restore proper cooling when towing or hauling.
Less Ideal for: People seeking a factory-manufactured original part or custom high-capacity coolers for extreme motorsport or continuous maximum-duty applications should consider other options.
- Vehicle-specific design to match original mounting and routing for listed Ram models
- DOT and SAE compliant construction that targets reliable cooling performance
- Factory-sealed, brand-new unit intended to replace a failed cooler quickly
- Made from durable materials aimed at long-lasting service
- Aftermarket product rather than manufacturer-supplied part, so buyers should verify exact OEM or Partslink numbers for fitment
Verdict: Choose this cooler if you need a direct-fit, DOT-compliant aftermarket replacement to restore reliable transmission cooling on a 6.7L Ram 2500/3500.
6. TRQ Radiator Assembly with Transmission Oil Cooler for 2013–2018 Ram 2500/3500/4500/5500 6.7L Diesel
| Fitment | Ram 2500/3500/4500/5500 2013-2018 L6 6.7L |
|---|---|
| Core Material | Aluminum |
| Core Row Quantity | 2 |
| Transmission Oil Cooler | Integrated, plated, internal |
| Flow Type | Cross Flow |
This TRQ radiator replaces the factory unit on 2013–2018 Ram 2500, 3500, 4500, and 5500 trucks with the 6.7L diesel and includes an internal transmission oil cooler. It is built with a two-row aluminum core and plastic tanks and ships pre-assembled to simplify installation as a direct-fit replacement. The integrated plated transmission cooler provides additional cooling capacity for heavy towing or hauling, and the cross-flow design helps consistent coolant flow and heat transfer. Practical benefits include simpler installation compared with rebuilding the original radiator, visible compatibility with common Ram part numbers, and included video resources to guide DIY installation. Limitations are the plastic end tanks versus all-metal alternatives and the modest core thickness, which may be less robust under extreme commercial use; professional installation is recommended if you lack experience removing front-end components. For buyers watching reviews and established fitment, this unit offers a sensible balance of compatibility and capability for typical towing and replacement needs.
Best for: Buyers who prioritize confirmed fitment and social proof and want a ready-to-install replacement that restores cooling and adds transmission cooling for everyday towing and light commercial use.
Less Ideal for: Drivers planning extreme towing, commercial fleet use, or offroad abuse who need a heavy-duty all-metal performance cooler should consider purpose-built aftermarket options instead.
- Direct-fit pre-assembled unit designed to replace the factory radiator for 2013–2018 6.7L Ram trucks
- Integrated plated transmission oil cooler adds transmission cooling without a separate external cooler
- Aluminum core and cross-flow layout improve heat transfer compared with older downflow designs
- Includes manufacturer videos and clear compatibility references to simplify DIY installation
- Plastic end tanks instead of full-metal construction, which can be less durable under extreme heat or impact
- Two-row core and 1.75 in thickness may be less heavy-duty than larger aftermarket performance radiators
Verdict: A direct-fit aluminum radiator that adds an internal transmission cooler and reliable, review-backed compatibility for 2013–2018 Ram 6.7L trucks seeking a straightforward replacement.
Choosing the Right 2010-2018 Ram 3500 Transmission Cooler: Key Factors to Consider
Cooling Capacity and Core Design
Cooling capacity determines how much heat the cooler can remove from the transmission fluid during towing and sustained heavy loads. For a Ram 3500, look for multi-row cores and larger frontal surface area that increase heat rejection. Tube-and-fin or plate-and-fin cores perform differently; plate-and-fin designs often provide higher efficiency in constrained spaces while tube-and-fin cores can be easier to repair.
Core thickness and fin density affect airflow and pressure drop. A thicker, multi-row core will remove more heat but can restrict airflow behind the grille if not sized properly. Choose a core that balances heat rejection with available mounting space on the Ram 3500 and consider whether additional airflow (such as mounting ahead of the radiator or adding a fan) is necessary for your typical towing scenarios.
Fitment and Compatibility With Ram 3500 Lines
Correct fitment to the 2010-2018 Ram 3500 transmission lines reduces installation time and lowers the chance of leaks. Some coolers are designed to use OEM locations and fittings, while others require adapter fittings or replacement transmission cooler lines. Verify inlet and outlet thread sizes and hose barb diameters match the truck's plumbing or are compatible with standard adapter kits.
Consider the mounting location too. Front-of-radiator or A/C condenser mounting maximizes airflow, while chassis-mounted coolers may be protected from road debris but see less airflow. If you plan to use an external cooler kit or retrofit transmission cooler lines, ensure the kit routing clears steering components, sway bar links, and suspension travel specific to the Ram 3500.
Durability and Corrosion Resistance
A cooler must withstand road debris, vibration, and environmental corrosion across many miles. Materials like brazed aluminum or heavy-gauge tubing resist corrosion and dissipate heat efficiently. Look for reinforced end tanks, robust mounting brackets, and protective coatings designed to resist salt and gravel damage common in long-haul and winter use.
Durability extends to fittings and hose clamps. Stainless or plated fittings and crimp-style clamps reduce leak risk under pressure and thermal cycling. For trucks used off-road or in salt-prone regions, prioritize coolers with proven corrosion-resistant finishes and replaceable mounting hardware to simplify future repairs.
Installation Complexity and Included Hardware
Installation time and complexity can vary from a simple sandwich-plate or in-line connection to a radiator-mounted or chassis-mounted installation that requires routing new lines. For owners who want a DIY install, look for coolers that include clear instructions, appropriate fittings, and pre-bent mounting brackets that match the Ram 3500's frame and front-end geometry.
If a cooler requires modification to the front bumper or bumper support, factor in additional time and tools. Kits that come with complete hose assemblies, clamps, and adapters reduce the chance of leaks and simplify the process. Also consider whether the install requires temporarily dropping the front fascia or removing the grille on the 2010-2018 Ram 3500 to access an optimal mounting location.
Serviceability and Maintenance Access
Routine checks and occasional flushing keep a transmission cooler functioning well. Choose a cooler with accessible fittings for pressure testing and flushing the transmission fluid cooler circuit. Units that allow in-place flushing reduce labor and mess during maintenance intervals. Also evaluate how easy it is to inspect for leaks and to replace damaged lines or the cooler core without extensive disassembly.
For high-mileage or heavy-tow owners, easier serviceability means shorter downtime and lower long-term maintenance costs. Consider whether an external cooler location will complicate periodic inspections or whether placement near the radiator allows quicker visual checks.
Pressure Rating and Flow Characteristics
A transmission cooler should maintain adequate flow while providing heat exchange. Too much restriction can starve the transmission pump, while too little surface area reduces cooling effectiveness. Check manufacturer flow and pressure-drop specifications where available and prefer designs that balance low restriction with high surface area.
Ensure the cooler's pressure rating exceeds the Ram 3500's transmission system pressure, including pressure spikes during towing or rapid throttle changes. Reliable hose and fitting choices that match those ratings prevent premature failures and leaks under load.
Recommended Mounting Locations on the Ram 3500
Choosing where to mount a transmission cooler on the 2010-2018 Ram 3500 affects cooling performance and protection. The highest airflow area is ahead of the radiator or A/C condenser, which maximizes heat rejection but exposes the cooler to road debris. A guard or screen can reduce impact damage without choking airflow.
Chassis-rail or bumper-mounted placements offer more protection and are common for off-road or plow-use trucks, but these locations receive less direct airflow and may need a larger core to achieve the same cooling effect. Consider how the truck is used when selecting a mounting spot.
- Ahead of radiator/condenser: best airflow, higher debris risk
- Behind bumper or skid area: better protection, less airflow
- Vertical vs horizontal mounting: vertical orientation often sheds debris better
Routing and Protecting Transmission Cooler Lines
Proper routing keeps lines clear of heat sources, moving suspension parts, and sharp edges. On the Ram 3500, follow the frame rails where possible and avoid tight bends that can accelerate line wear. Use protective sleeves or convoluted tubing where lines pass near the exhaust or steering linkages.
Secure the lines to the frame with rubber-lined clamps to minimize chafing and vibration. Leave enough slack for suspension travel and steering articulation to prevent tension on fittings during axle movement.
- Avoid routing near exhaust pipes or manifolds
- Use crimped fittings or high-quality hose clamps to prevent leaks
- Check routing after a few miles of towing to ensure clamps remain tight
Signs It Is Time To Add or Upgrade a Cooler
If your Ram 3500 frequently tows near its capacity or you drive in sustained high temperatures, transmission fluid temperatures can creep into ranges that accelerate wear. Symptoms such as higher-than-normal fluid temperature readings, delayed gear shifts, or softer shift feel under load often indicate the transmission is running hot.
Repeated heavy towing, towing on steep grades, or using a mobile home or fifth-wheel can all justify adding an auxiliary cooler. Monitor fluid temperature under typical loads to determine whether a larger or additional cooler is necessary.
- Consistent elevated fluid temps during towing
- Changes in shift firmness or timing under load
- Recent transmission service intervals or fluid breakdown
Flushing and Fluid Considerations for Cooler Installation
When installing a new cooler or replacing lines on a 2010-2018 Ram 3500, flush the transmission cooler circuit to remove debris and contaminant buildup. Flushing prevents old varnish and particulates from entering the new cooler and reduces the risk of clogging.
Choose the correct transmission fluid specification for your truck and consider a full fluid and filter service if the fluid shows signs of breakdown. After installation, recheck fluid level and re-check for leaks after a short test drive under load.
- Flush cooler loop before connecting to a new unit
- Replace filter and top up with manufacturer-specified fluid
- Check fluid temperature after initial installation and after a test tow
Balancing Protection and Airflow With Guards and Screens
Protective screens or guards reduce impact damage but can reduce airflow if too dense. For the Ram 3500, choose guards designed to preserve airflow while stopping larger debris. Some guards mount a few inches ahead of the cooler to deflect stones before they reach the core.
Inspect protective screens regularly for accumulated mud and leaves. Clogged guards negate the benefit of an auxiliary cooler by restricting airflow and increasing fluid temperature during towing.
- Select guards rated for high airflow and impact protection
- Regularly clean guards after off-road or dirty-road use
- Consider removable guards if frequent cleaning is necessary
Still looking for the perfect fit?
Select your Ram 3500 configuration to see the most relevant Transmission Coolers recommendations
How We Chose the Best 2010-2018 Ram 3500 Transmission Cooler
We focused on criteria that matter for heavy-duty use in a 2010-2018 Ram 3500 and prioritized features that directly affect cooling performance, durability, and fitment. Cooling capacity was measured by rated heat rejection and core design, with preference for larger, multi-row cores and efficient fin geometries that handle high tow loads and stop-start traffic. Fitment and plumbing compatibility were checked to ensure the cooler integrates with Ram 3500 factory lines or common upgrade lines without requiring extensive fabrication.Construction and corrosion resistance were assessed, favoring coolers with brazed-aluminum cores or corrosion-resistant tubing and fittings for long-term reliability in road salt and humid environments. Installation practicality was weighed, including mounting options, included hardware, and whether installation could be completed with common garage tools or needs professional assistance. Serviceability and maintenance were reviewed, such as access for flushes and replacement of lines or fittings.We excluded compact units intended only for mild-duty cars and universal kits that require heavy modification unless they offered documented fitment pathways for the 2010-2018 Ram 3500. Final selections balanced cooling performance, installation practicality, and build quality appropriate for frequent towing and heavy use.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I know if my Ram 3500 needs an external transmission cooler?
If you tow heavy loads frequently or notice higher-than-normal transmission fluid temps, delayed or soft shifts under load, or have recently serviced the transmission due to overheating, an auxiliary cooler can help. Monitoring fluid temperature during a typical tow is the most reliable indicator.
Can I install a transmission cooler myself on a 2010-2018 Ram 3500?
Many owners can install a cooler with basic tools if the kit includes compatible fittings and clear instructions. More complex installs that require new line routing, bumper removal, or fabrication are better handled by a shop. Always follow torque specs and pressure-test fittings before driving under load.
Where is the best place to mount a cooler on the Ram 3500?
Mounting ahead of the radiator or A/C condenser provides the best airflow and cooling performance. For protection, consider chassis or bumper-mounted locations, but compensate with a larger core because airflow will be reduced in those positions.
Will adding a cooler change how I maintain transmission fluid?
Adding a cooler does not remove the need for scheduled fluid and filter changes. It can reduce fluid degradation rates, but you should still follow service intervals and flush the cooler circuit when performing major transmission service or when installing a new cooler.
Do I need new transmission lines when installing an external cooler?
Not always. Some coolers connect to the factory cooler lines with adapter fittings or a sandwich plate, but other installs use new hoses for optimal routing and protection. Choose the approach that provides secure connections and avoids interference with steering and suspension components.
How can I protect my cooler from road debris without hurting performance?
Use a purpose-designed guard that balances impact protection and airflow. Position the guard a short distance ahead of the core so it deflects stones but does not sit directly against the fins, and clean it regularly to prevent airflow restriction.
Final Verdict
For a 2010-2018 Ram 3500 that regularly tows or carries heavy loads, prioritize a transmission cooler that balances high cooling capacity with reliable fitment and durable construction. Consider how and where you will mount the cooler, the routing and protection of lines, and service access when choosing a unit.Tradeoffs are inevitable: the most efficient cores are larger and may require more careful mounting and protection, while protected mounts sacrifice some airflow. Focus on core design, correct pressure and flow ratings, and corrosion-resistant construction to make a confident selection for prolonged towing duty.
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