A Guide to the Automatic Transmission Oil Cooler for the 2016-2024 Ram 3500
Protect your Ram 3500's transmission from its greatest enemy—excessive heat.
- Check if your truck is affected by NHTSA recall 22V-835, which can cause a fire risk due to overheating and fluid expulsion.
- Choose your cooler based on your truck's usage: a standard replacement for daily driving or a heavy-duty upgrade for towing and hauling.
- Heat is the #1 enemy of the 68RFE and Aisin transmissions; an upgraded cooler is one of the best ways to extend transmission life.
- Consider replacing the thermostatic bypass valve at the same time, as it is a common failure point that can cause overheating.
Is Your Ram 3500 Transmission Running Hot?
The transmission in your Ram 3500 is built to work hard, but heat can shorten its life significantly. The factory-installed transmission cooler is a standard tube-and-fin unit that can be overwhelmed by heavy towing, steep grades, or hot climates. When the cooler can't keep up, or if it fails, the transmission fluid gets too hot, loses its ability to lubricate properly, and can lead to serious damage.
Important Safety Recall Information
There is a significant safety recall (NHTSA ID: 22V-835, Ram code: ZA3) for some 2020-2023 Ram 2500 and 2020-2022 Ram 3500 trucks with the 6.7L Cummins engine and 68RFE transmission. A buildup of heat and pressure can force hot transmission fluid out of the dipstick tube and into the engine bay, creating a serious fire risk. The fix involves replacing the dipstick and vent assembly. Check with a dealer to see if your truck is affected.
🎬 Watch: Important details on the Ram fire risk recallSymptoms of a Failing Transmission Cooler
A bad transmission cooler can cause several problems. You might see a dashboard warning light or notice your transmission temperature gauge climbing higher than normal, especially under load. Other signs include finding puddles of red or brown transmission fluid under your truck, which could mean the cooler or its lines are leaking. You may also experience poor shifting performance, such as clunky or delayed shifts, as the hot fluid starts to break down.
🎬 See more symptoms and costs of a failing coolerChoosing the Right Aftermarket Cooler
When replacing your transmission cooler, you have a choice between standard replacements and heavy-duty upgrades. Your decision should be based on how you use your truck.
Standard Replacement Coolers
These are designed to match the fit and performance of the original factory part. They are a cost-effective solution if your original cooler is leaking or damaged and you use your truck for daily driving or light towing.
- Dorman: A well-known brand that offers direct-fit replacement parts. A Dorman cooler is a reliable choice for restoring stock performance without the high cost of an OEM part.
- Global Parts / Skyward: These brands offer another option for standard replacement, though specific reviews for the Ram 3500 are less common. They are typically priced competitively for budget-conscious repairs.
Performance & Heavy-Duty Coolers (Upgrades)
If you tow heavy trailers, live in a hot climate, or have modified your truck for more power, a performance cooler is a smart investment. These are larger and more efficient than the stock unit, providing the extra cooling capacity needed to protect your transmission under extreme stress.
- Mishimoto: A popular choice for a direct-fit upgrade. Mishimoto coolers are significantly thicker, hold more fluid, and have more cooling fins than the stock cooler, resulting in much lower transmission temperatures. They are known for high-quality construction and come with a lifetime warranty.
- BD Diesel: This brand specializes in extreme-duty auxiliary coolers that work with your existing cooler to provide maximum cooling. These kits, often featuring their own electric fans, are for the most demanding applications like competitive pulling or constant heavy hauling.
Pro Tip: Many owners also upgrade or delete the factory thermostatic bypass valve. This part can fail and block fluid flow to the cooler. Aftermarket bypass valves ensure constant fluid flow to the cooler, removing a common point of failure.
🎬 Watch: How to install a thermostat bypass valveCost to Replace a Ram 3500 Transmission Cooler
| Part Type | Estimated Part Cost |
|---|---|
| New Aftermarket | $99.95 - $999.95 |
| New OEM (Cooler Only) | $70 - $150 |
| Shop Labor | $300 - $700 |
Note: OEM costs can be significantly higher if the entire cooler/condenser assembly is replaced. Costs are estimates and will vary by location and vehicle configuration.
Frequently Asked Questions
Can I replace the transmission cooler myself?
Yes, if you have moderate mechanical skill and the right tools. The job often requires removing the front bumper for access and using a special tool to disconnect the fluid lines. It's important to work carefully to avoid damaging the new cooler or lines and to properly refill the transmission fluid to the correct level afterward.
What is the difference between a tube-and-fin and a bar-and-plate cooler?
The stock cooler is a tube-and-fin design, which is lightweight and inexpensive. High-performance coolers are often a bar-and-plate design. Bar-and-plate coolers are stronger and more efficient at transferring heat, making them better for heavy-duty use.
Do I need an auxiliary cooler?
An auxiliary cooler, like those from BD Diesel, is typically only needed for extreme use cases. This includes trucks with significant horsepower upgrades, those used for competitive events, or for constant, very heavy towing (hot-shotting). For most owners, even those who tow heavy RVs, a high-quality direct-fit upgrade like a Mishimoto is more than sufficient.
Will a bigger cooler over-cool my transmission in the winter?
This is a common concern but generally not an issue. The transmission generates its own heat, and the thermostatic bypass valve is designed to help it reach operating temperature. In very cold climates, some owners use winter fronts to cover the grille and help all the cooling systems (radiator, intercooler, and trans cooler) warm up faster.
Helpful Videos
Technical Specifications
OEM Part Numbers: 68322497AD 68322497AC 68322497AB 68322497AA 52014715AA 68322494AD
Fits 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, and 2024 Ram 3500 models with automatic transmissions (68RFE and Aisin). Aftermarket options include standard tube-and-fin designs and upgraded bar-and-plate or high-efficiency tube-and-fin coolers.
We Have This Part in Stock
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.
- Ram 3500: