Ram 3500 Automatic Transmission Oil Cooler Guide (2011-2015)
Keep your Ram's transmission running cool, especially when towing or hauling heavy loads.
- Overheating is the #1 killer of Ram 3500 transmissions; a functioning cooler is not optional.
- Fluid leaks are the most common sign of failure; check for reddish fluid spots under the front of your truck.
- For heavy towing, upgrade to a performance cooler from a brand like Mishimoto or BD Diesel for better protection.
- Consider replacing the thermal bypass valve at the same time, as it's a known failure point on 68RFE transmissions.
Is Your Ram 3500's Transmission Cooler Failing?
A failing transmission cooler can lead to expensive transmission damage. Catching the problem early is key. Look out for these common signs of failure.
🎬 Watch: 7 common symptoms of a bad transmission cooler.Symptoms of a Bad Transmission Cooler
- Transmission Overheating: A warning light on your dash or a high reading on the temperature gauge is a serious sign. Your truck might even go into a reduced power "limp mode" to protect itself.
- Fluid Leaks: This is the most common symptom. You might see puddles of reddish or brown fluid under the front of your truck. Leaks often start at the cooler's line fittings.
- Burnt Smell: If the transmission fluid gets too hot, it can burn. This is a sign of severe overheating and requires immediate attention.
- Poor Shifting: You might feel delayed shifts, harsh gear changes, or a sensation of the gears slipping. This can happen when the fluid is too hot or too low.
Known Issues for Ram Heavy Duty Trucks
For Ram trucks with the 68RFE transmission, a common issue is the factory thermal bypass valve sticking. This valve is designed to help the transmission warm up faster, but it can fail and restrict flow to the cooler, causing overheating even when the cooler itself is fine. Some owners choose to install a bypass delete kit for more reliable cooling. 🎬 See how to install a thermal bypass valve upgrade. Additionally, the stock coolers are often considered undersized for heavy towing, leading many owners to upgrade.
Choosing a New Aftermarket Transmission Cooler
When replacing your cooler, you have options ranging from direct-fit standard replacements to heavy-duty performance upgrades. Your choice depends on how you use your truck.
Standard Replacement Coolers
These are designed to be direct, OE-style replacements that restore factory function. They are a cost-effective choice for daily driving and light-duty use.
- Brands: Dorman, Four Seasons, Hayden, Global Parts
- Best For: Owners who use their truck as a daily driver with occasional light towing and want a straightforward, affordable repair. Dorman is a well-known aftermarket brand offering direct-fit replacements that are try-on tested for fitment.
Heavy-Duty & Performance Coolers
If you frequently tow heavy trailers, haul large loads, or have a modified engine, a heavy-duty cooler is a smart investment. These coolers are larger and more efficient than the stock unit.
- Brands: BD Diesel, Mishimoto
- Best For: Truck owners who tow fifth wheels, gooseneck trailers, or heavy equipment. Mishimoto, for example, offers coolers with significantly increased core volume and fin area for superior heat dissipation. These upgrades are designed to handle the extra heat generated by heavy work. 🎬 Watch this step-by-step Mishimoto performance cooler installation guide.
Pro Tip: When you replace your transmission cooler, it's a good idea to also flush the system and replace the transmission fluid and filter. If the old cooler failed due to an internal blockage, flushing the lines is critical to prevent debris from damaging the new cooler and the transmission.
Cost to Replace a 2011-2015 Ram 3500 Transmission Cooler
| Part Type | Estimated Part Cost |
|---|---|
| New OEM | $376 - $675 |
| New Aftermarket | $52 - $1,000 |
| Shop Labor | $317 - $465 |
Frequently Asked Questions
Do I need a heavy-duty cooler for my Ram 3500?
If you frequently tow loads near your truck's maximum capacity or drive in hot climates, a heavy-duty cooler is highly recommended. The stock cooler can be overwhelmed by the heat generated under heavy loads, and an upgraded cooler provides an essential safety margin to protect your transmission.
Is replacing the transmission cooler a DIY job?
For a mechanically inclined person with the right tools, yes. The job involves draining fluid, disconnecting lines (which may require a special quick-disconnect tool), and unbolting the cooler from the front of the truck. It's rated as moderately difficult and can take 2-3 hours. However, it can be messy, and ensuring the lines are reconnected without leaks is critical.
What are TSBs or recalls for this part?
No specific recalls were found for the transmission oil cooler itself on the 2011-2015 Ram 3500. However, there was a recall (NHTSA 13V-234) for some 2012-2013 Jeep Wranglers where the transmission cooler tube could contact the power steering return tube, causing a leak. While not for the Ram 3500, it highlights the importance of checking for proper clearance of all lines after installation.
Should I get a stacked-plate or a tube-and-fin cooler?
Both types work, but stacked-plate and bar-and-plate coolers are generally considered more durable and efficient at rejecting heat than older tube-and-fin designs, making them a better choice for heavy-duty applications. Performance brands like Mishimoto and Fluidyne often use bar-and-plate or tube-and-fin designs with internal fins to maximize cooling.
Helpful Videos
Technical Specifications
OEM Part Numbers: 55056951AC 52014522AB 68590696AA 55056824AB
The 2011-2015 Ram 3500 uses an auxiliary air-to-fluid cooler mounted at the front of the vehicle. It cools fluid for either the Chrysler 68RFE or Aisin AS69RC 6-speed automatic transmissions. Connections are typically quick-connect style fittings. Upgraded coolers offer increased core size and fluid capacity for better thermal efficiency under load.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
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