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If you drive a Chrysler 300 regularly with towing, spirited driving, or heavy-city traffic, transmission temperature can make a big difference in longevity and shifting consistency. Choosing the right transmission cooler helps prevent overheating and premature wear, especially when your vehicle operates under sustained load. This guide presents seven shortlisted transmission coolers selected for Chrysler 300 owners. We evaluated performance, installation complexity, and fitment to help you pick an option that matches how you drive. Read on to see which coolers met our criteria and why they might suit your needs.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | EVIL ENERGY 5/16" Transmission Oil Cooler Kit, 6-Pass Tube-and-Fin |  |
| Most Popular A crowd favorite that many people choose with confidence | EVIL ENERGY 10AN 16-Row Stacked-Plate Oil Cooler |  |
| Best Quality Built to a higher standard if you want something more solid | TRQ A/C Condenser and Receiver Drier Assembly with Transmission Oil Cooler |  |
| Best Budget The cheapest option that still gets the job done reliably | A-Premium 4-Pass Aluminum Transmission Oil Cooler Kit |  |
| Most Sold A high-volume bestseller chosen again and again | KOROP LPD47391 40K Low Pressure Drop Transmission Oil Cooler Kit |  |
| Best Value for Money The sweet spot between price and what you get | A-Premium 8-Row Aluminum Transmission Oil Cooler Kit |  |
| Best Overall The best all-around choice for most situations | Dorman 624-284 Automatic Transmission Oil Cooler Hose Assembly |  |
1. EVIL ENERGY 5/16" Transmission Oil Cooler Kit, 6-Pass Tube-and-Fin
| Core type | Tube-and-fin |
|---|---|
| Core passes | 6-pass |
| Hose inner diameter | 5/16" ID |
| Hose material | CPE |
| Working pressure | 145 PSI |
This EVIL ENERGY kit is a compact 6-pass tube-and-fin transmission cooler sold as a universal retrofit for systems that use 5/16" ID transmission lines. It is typically mounted ahead of the radiator or condenser where airflow is good and connected inline with the factory cooler to lower automatic transmission fluid temperatures during towing, long climbs, or heavy city traffic. The cooler is aluminum, comes with CPE hose rated for high pressure, and includes adapters and basic mounting clips so a competent DIYer can install it without custom fabrication. Reported benefits include steady drops in ATF temperature and improved shift consistency under load. Limitations to note are the universal fittings can require modification or a proper flare tool for a leak-free connection, and the small six-pass core may be undersized for very heavy-duty towing on larger V8s. Expect to do some trimming or fabricate stronger brackets for a long-term mounting solution on a Chrysler 300.
Best for: Reliability-focused buyers who prioritize keeping transmission temperatures in check to protect the gearbox during towing, frequent stop-and-go driving, or heavy-load use in a Chrysler 300.
Less Ideal for: Owners seeking a direct-fit, vehicle-specific cooler or those who prefer a dealer-quality replacement without any modification or extra fabrication.
- 6-pass tube-and-fin core provides meaningful ATF cooling compared with no auxiliary cooler
- Aluminum construction resists corrosion and is lightweight for easier mounting
- Includes hoses, adapters, and basic mounting hardware for a mostly complete install
- CPE hoses rated for high working pressure reduce burst risk under normal operating conditions
- Universal adapters and included fittings may not seal perfectly and can need re-flaring or replacement
- Mounting clips provided are basic and may require fabrication of stronger brackets for permanent installation
Verdict A compact, value-oriented 6-pass aluminum cooler that reliably reduces transmission fluid temps for a Chrysler 300 but may need minor fitting or mounting work for a polished install.
2. EVIL ENERGY 10AN 16-Row Stacked-Plate Oil Cooler
| Oil capacity | 0.39 L |
|---|---|
| Test pressure | 116 PSI |
| Burst pressure | 232 PSI |
| Material | Aluminum alloy |
This EVIL ENERGY stacked-plate oil cooler is a compact, aftermarket cooler intended to reduce transmission and engine oil temperatures by routing fluid through a 16-row stacked plate core with AN-style fittings. It is typically mounted where airflow is available and connected into the transmission cooler loop or oil circuit; installation requires brackets and appropriate AN adapters for Chrysler 300 transmission lines. Notable features include a high test and burst pressure rating, a compact footprint that fits tight engine bays, and machined aluminum construction that resists corrosion. In practice it offers measurable temperature drops on moderate loads and is useful for towing, spirited driving, or restoring cooling on older transmissions. Limitations include the need for correct AN adapters or braided lines to mate to factory fittings and occasional reports of fitting failures when improperly installed or overtightened. The cooler's small capacity means owners of heavily loaded or high-power Chrysler 300 builds may prefer a larger unit or dual-cooler solution.
Best for: A convenience-driven buyer who wants a straightforward, compact transmission cooler solution for a Chrysler 300 to lower operating temps without extensive fabrication.
Less Ideal for: Owners planning heavy towing, high-horsepower upgrades, or continuous severe-duty use on a Chrysler 300 should consider larger or multi-core coolers for greater capacity and longevity.
- Stacked-plate core delivers efficient heat transfer in a compact package.
- Machined aluminum construction resists corrosion and is lightweight.
- 10AN fittings simplify hookup to aftermarket braided lines and adapters.
- High test and burst pressure ratings indicate robust pressure tolerance.
- Requires AN adapters or custom fittings to attach to Chrysler 300 factory transmission lines.
- Smaller 16-row unit has limited oil capacity compared with larger coolers for heavy-duty use.
Verdict A compact, easy-to-install stacked-plate cooler that cuts transmission temps on Chrysler 300s but may be undersized for heavy-duty or high-power applications.
3. TRQ A/C Condenser and Receiver Drier Assembly with Transmission Oil Cooler
| Core Material | Aluminum |
|---|---|
| Core Thickness | 0.75 in |
| Core Width | 18.62 in |
| Core Length | 24 in |
| Mounting Hardware Included | Yes |
This TRQ condenser assembly combines the vehicle air conditioning condenser, receiver drier and a built-in transmission oil cooler into a pre-assembled direct-replacement unit. It is intended for Chrysler 300 applications that require a condenser with an integrated power steering cooler and transmission oil cooler; installation is typical for replacement of a failed or leaking condenser and is aimed at DIYers or shops wanting a quicker swap because mounting hardware and assemblies come pre-attached. The core is aluminum and the product is made to match factory mounting points, which helps with fit and reduces modification during installation. Practical benefits include an integrated transmission oil cooler so you replace one part rather than multiple separate components and the included mounting hardware speeds installation. Limitations are that fitment must be confirmed for specific Chrysler 300 model years and configurations because there are several variants, and some buyers report material and finish differences compared with factory-quality parts which may affect long-term durability under heavy-duty use.
Best for: Performance-oriented buyers who prioritize restoring cooling and transmission cooling function quickly and prefer a consolidated, ready-to-install assembly to reduce shop time and downtime.
Less Ideal for: Buyers seeking an exact factory-match cosmetic finish or those needing a bespoke high-end racing cooler setup should consider other specialized options.
- Pre-assembled unit combining condenser, receiver drier and transmission oil cooler for faster replacement
- Aluminum core that aids heat dissipation and corrosion resistance
- Includes mounting hardware for a more straightforward installation
- Direct-fit design targeting Chrysler 300 configurations to minimize modifications
- Appearance and finish are not always identical to factory parts which some buyers noted
- Multiple vehicle variants mean you must double-check exact fitment before ordering
Verdict A convenient integrated condenser and transmission oil cooler for Chrysler 300 owners who want a fast direct-replacement solution, provided you verify the exact fitment.
4. A-Premium 4-Pass Aluminum Transmission Oil Cooler Kit
| Material | Aluminum |
|---|---|
| Core type | 4 Pass Tube and Fin |
| Intended duty | Normal duty driving, light towing up to 12000 lb |
| Manufacturer part number | APOC140 |
This A-Premium 4-pass transmission oil cooler is a budget-friendly aluminum unit supplied with basic hoses, clamps, and mounting hardware for a DIY installation. It is designed to lower transmission fluid temperatures for normal-duty driving and light towing, and the 4-pass tube-and-fin core improves heat transfer compared with single-pass designs. Typical use is as an add-on to the factory cooler or as an auxiliary cooler for vehicles running heavier loads or towing modest trailers. The kit’s strengths are its simple construction and included fittings that let you mount it in front of the radiator or behind bumper openings. Important limitations are fitment and plumbing: the kit uses 3/8 inch fluid line and fittings which may not match Chrysler 300 factory line sizes, so expect to source adapters or different hose ends for a clean installation. Some reviewers also reported small hardware and clamp quality that may warrant replacement during install.
Best for: Budget-conscious owners seeking an inexpensive auxiliary transmission cooler for normal driving or occasional light towing who are comfortable sourcing minor adapters and doing a hands-on install.
Less Ideal for: Drivers who need a direct-fit, vehicle-specific cooler or who plan heavy towing and require a higher-capacity, professionally matched system should choose a dedicated Chrysler 300-specific cooler instead.
- 4-pass aluminum core for improved cooling versus single-pass cores
- Includes hoses, clamps, and mounting hardware for a basic DIY installation
- Compact footprint allows mounting in tight bumper or radiator openings
- Offers a one-year unlimited-mileage guarantee from the brand
- Universal plumbing uses 3/8 inch fittings that may not match Chrysler 300 factory lines without adapters
- Basic hose clamps and fittings may be lower quality and could require upgrade during installation
Verdict A cost-effective auxiliary cooler that improves transmission cooling for light-duty Chrysler 300 use but may need plumbing adapters and stronger clamps for a reliable fit.
5. KOROP LPD47391 40K Low Pressure Drop Transmission Oil Cooler Kit
| Material | Alloy Steel, Aluminum |
|---|---|
| Connector Type | Flare |
| Thread Type | NPT |
| Thread Size | 3/8 |
This KOROP LPD47391 40K transmission oil cooler is a brazed-aluminum, low-pressure-drop cooler sold as a complete kit with brackets, fasteners, and hoses. It installs inline with the transmission cooling circuit to carry fluid through a larger dedicated cooler instead of relying solely on the radiator. The low-pressure-drop design and multi-row construction boost heat transfer so operating temperatures run lower under load and during towing. In practice the kit is straightforward to mount and most buyers report noticeably lower transmission temps after installation, and the supplied fittings cover a range of install approaches. Limitations to note are the nonstandard 3/8 inverted-flare connector orientation and mixed reports about supplied hose quality, which means you may prefer to fit higher-grade hoses or adapters during install. For a risk-averse buyer looking to protect a Chrysler 300 transmission during towing or heavy use, this cooler offers a clear cooling upgrade but plan for minor install tailoring for factory plumbing and secure hose routing.
Best for: Practical, risk-averse owners who prioritize protecting their Chrysler 300 transmission during towing, long trips, or frequent heavy use and want a factory-quality cooling upgrade.
Less Ideal for: Owners seeking a no-modification, plug-and-play factory replacement with exact hose and fitting matches or those who prefer dealer-installed solutions should consider alternatives.
- Brazed-aluminum, multi-row core for higher heat transfer and durability
- Low-pressure-drop design preserves flow while improving cooling
- Comes with mounting hardware and a range of fittings for a complete install
- Suitable for heavy-duty and towing applications up to the 40,000 GVW class
- Uses 3/8 inverted-flare/NPT style fittings that may require adapters to match Chrysler 300 factory lines
- Some buyers reported premature hose failures in supplied hoses so replacement hoses may be needed
Verdict A durable, low-pressure-drop cooler kit that meaningfully lowers transmission temps for a Chrysler 300 but may require hose or adapter adjustments during installation.
6. A-Premium 8-Row Aluminum Transmission Oil Cooler Kit
| Material | Aluminum |
|---|---|
| Core type | 8 pass tube and fin |
| Reference numbers | 1405, 405, 53003 |
| Manufacturer | PremiumpartsWhosale |
This A-Premium 8-row aluminum transmission oil cooler is a universal inline kit that adds an extra heat exchanger to your transmission cooling loop. It is typically mounted in front of the condenser or alongside the factory cooler and plumbed into the transmission lines to lower fluid temperatures during towing, heavy traffic, or spirited driving. Notable features include an 8-pass tube-and-fin core that increases surface area for heat transfer, silicone hose, and a basic mounting and hose kit to get the job done. In practice it delivers measurable cooling for high-load use and can be run in series with the Chrysler 300 factory cooler to further reduce fluid temperatures. The kit is an affordable way to protect transmission life under load, but installation may require additional fittings, clamps, or custom brackets depending on your 300’s model year and engine bay layout. The kit does not include vehicle-specific fittings or extensive hardware, so budget for a short trip to a parts store or a modest fabrication effort if you want a neat, long-term installation.
Best for: Practical optimizers seeking an inexpensive, effective way to reduce transmission temperatures on a Chrysler 300 during towing, heavy city driving, or frequent highway loads who prefer cost-effective upgrades over full factory replacements.
Less Ideal for: Buyers wanting a plug-and-play, vehicle-specific kit with all fittings and mounting brackets included or those unwilling to do minor fabrication or source extra hardware.
- 8-pass aluminum tube-and-fin core increases cooling capacity under load
- Includes silicone hose and basic mounting kit for a functional installation
- Universal design lets you add extra cooling without replacing factory components
- Affordable option to lower transmission fluid temperatures for towing or heavy use
- Does not include vehicle-specific fittings or OEM-style clamps
- Mounting hardware is basic and may require fabrication for a tidy fit
Verdict A budget-friendly 8-row aluminum cooler that meaningfully lowers transmission temps for a Chrysler 300 but needs extra fittings and tidy mounting work for a finished installation.
7. Dorman 624-284 Automatic Transmission Oil Cooler Hose Assembly
| Material | Metal, Rubber |
|---|---|
| Maximum Pressure | 100 Pound per Square Inch |
| Nominal Wall Thickness | 0.25 inches |
| Outside Diameter | 0.5 Inches |
This Dorman hose assembly replaces leaking or damaged transmission cooler lines and is built to match factory fit and function for the listed vehicles. It combines metal and rubber sections with factory-style connectors so installers can reuse existing retainers and clip points. Typical use is a direct repair when the original line develops a leak or is damaged by road debris; installation is straightforward for a competent DIYer or technician and usually requires basic hand tools. Notable features include a claimed maximum pressure rating and nominal wall thickness that indicate robust construction, and multiple customer reports of solid fit and no leaks after installation. Limitations are that the kit does not include snap-in retainer clips so you may need to source those separately if any are lost, and a few reviewers noted small differences at the hose ends that can feel slightly less secure than the factory part even though they did not cause leaks. For Chrysler 300 owners this offers a practical, cost-effective replacement that restores cooling circuit integrity without complex modification.
Best for: Balanced buyers who want a reliable, ready-to-install replacement to stop transmission cooler leaks and keep a Chrysler 300 running without expensive dealer parts or complicated upgrades.
Less Ideal for: Owners seeking an upgraded performance cooler or a complete replacement cooler system rather than a direct hose assembly should consider other options.
- Direct replacement designed to match factory fit and function for listed vehicles
- Durable metal and rubber construction with measurable wall thickness and pressure rating
- Multiple customer reports of easy installation and leak-free performance
- Made by a recognized aftermarket manufacturer with product support and documentation
- Does not include snap-in retainer clips that are sometimes needed during installation
- Some hose ends differ slightly from factory lead-in chamfers which can feel less snug in clips
Verdict A practical, factory-fit replacement hose assembly that fixes leaks and restores transmission cooling on compatible Chrysler vehicles at a fraction of dealer cost.
Choosing the Right Chrysler 300 Transmission Cooler: Key Factors to Consider
Cooling Capacity and Heat Rejection
Cooling capacity determines how effectively a unit lowers transmission fluid temperature under sustained load. Higher heat rejection reduces thermal breakdown of fluid, helps preserve clutch and band material, and maintains hydraulic pressure for consistent shifts.
When evaluating capacity, consider the typical driving conditions you expose the car to, such as frequent towing or extended highway runs. Look for specifications that quantify temperature drop or flow rate at given loads so you can match the cooler to your use case rather than relying on generic claims.
Physical Fitment and Mounting
A cooler that cannot be securely mounted or that interferes with other components will cause installation headaches and potential damage. Check the cooler's dimensions, mounting points, and clearance requirements relative to the Chrysler 300’s radiator and front fascia area.
Mounting style matters too. Bolt-on brackets, sandwich adapters, or radiator-mounted options each have tradeoffs in airflow exposure and ease of access. Prioritize designs that provide secure mounting without obstructing airflow to the engine or radiator.
Connection Type and Line Compatibility
Transmission coolers connect to the transmission via fittings or hose clamps. Compatibility with existing transmission cooler lines reduces the need for additional hoses or adapters. Consider whether the cooler requires new dedicated lines or can use the factory feed and return routing.
Pay attention to fitting types, such as barbed, threaded, or quick-disconnect, and the quality of included clamps or adapters. Secure, leak-free connections are essential to avoid fluid loss and pressure issues.
Installation Complexity
Installation difficulty varies from simple radiator-mounted units to external heat exchangers that need routing and additional brackets. Consider your mechanical skill level and whether you will use a professional installer. Installation complexity affects total time on the vehicle and the likelihood of mistakes that could cause leaks or poor cooling performance.
Also review whether the product includes a comprehensive transmission cooler kit with hoses, fittings, and brackets. A complete kit reduces trips to the parts store and helps ensure compatibility with the Chrysler 300’s existing systems.
Durability and Corrosion Resistance
Transmission coolers are exposed to road debris, moisture, and varying temperatures, so material quality matters. Look for corrosion-resistant cores and protective coatings that extend service life. Strong end tanks and reinforced connections reduce the chance of cracks or failure from vibration.
Consider the long-term effects of road salt and debris for winter driving. Durable construction lowers the risk of a cooler developing leaks or losing efficiency over time, which preserves transmission health and reduces maintenance needs.
Serviceability and Maintenance
Some coolers allow for flushing or partial disassembly to remove accumulated debris, while others are sealed units that require full replacement if contaminated. Easy-to-access mounting and fittings make routine checks and fluid changes simpler.
Evaluate whether the design allows inspection of fittings and whether replacement hoses and parts are readily available. A serviceable cooler can extend the useful life of the component and make future maintenance less time-consuming and costly.
FAQ
How do I know if my Chrysler 300 needs a transmission cooler?
Look for signs such as unusually high transmission operating temperatures, frequent towing or heavy loads, or heat-related performance issues during long drives. While modern transmissions manage heat well, added loads or stop-and-go traffic can push temperatures higher than ideal. Monitoring fluid temperature or watching for symptoms like harsh shifts can indicate a need for additional cooling.
Can I install a transmission cooler myself on a Chrysler 300?
Many owners can handle a radiator-mounted or bolt-on cooler with basic tools and mechanical aptitude. More involved installations that require rerouting lines, using a separate heat exchanger, or modifying brackets may be best left to a professional. Consider whether the product comes as a transmission cooler kit that includes hoses and fittings to simplify the process.
Will adding an external transmission cooler improve transmission life?
Adding a well-matched external transmission cooler often reduces operating temperature, which can slow fluid degradation and extend component life under heavy use. The benefit depends on the cooler’s heat rejection, proper installation, and matching the cooler to your driving conditions. Routine maintenance and correct fluid levels remain important.
Are universal transmission coolers a good option for the Chrysler 300?
Universal coolers can work if they fit the vehicle and you have the right fittings and brackets. They often require more planning for mounting and line routing. If you choose a universal unit, confirm its dimensions, connection types, and whether it meets the cooling needs for the Chrysler 300 in your typical driving scenarios.
How often should transmission cooler lines be inspected?
Inspect cooler lines and connections during routine maintenance or at least once a year. Look for signs of wear, cracks, leaks, or loosened clamps. Early detection of line issues prevents fluid loss and overheating, and addressing minor problems promptly reduces the risk of more serious transmission damage.
How We Chose the Best Chrysler 300 Transmission Cooler
We focused on transmission coolers that are compatible with the Chrysler 300 platform and that address common thermal and installation challenges for this vehicle. Key evaluation criteria included heat rejection capacity under sustained load, physical fitment and mounting options for the Chrysler 300, the simplicity and clarity of installation instructions and required hardware, and the durability of materials and connections including corrosion resistance and line fittings. Additional considerations were whether a unit required external plumbing changes or could integrate with existing lines, the availability of compatible transmission cooler lines and brackets, and whether the cooler design supported serviceability or cleaning. We excluded products that lacked specific fitment information for the Chrysler 300, those with unclear warranty or build-spec details, and items designed only for light-duty applications. The result is a list of practical options that balance cooling performance and real-world installation needs for Chrysler 300 owners.
Our full evaluation process is outlined in our review methodology.
Conclusion
Prioritize a transmission cooler that matches how you use your Chrysler 300. If you frequently tow, drive in heavy traffic, or push the car hard, choose a unit with higher heat rejection and durable construction. For lighter use, a simpler radiator-mounted option with easy fitment may be sufficient. Balance cooling performance, installation complexity, and long-term durability when deciding. Confirm fitment, connection types, and whether a complete kit is available to streamline installation and keep the transmission running cooler for longer.
