2016 Ram 3500 Transmission Fluid & Service

Quick Answer

• Transmissions: Aisin AS69RC (6.7L Cummins High Output), 68RFE (6.7L Cummins Standard Output), or 66RFE (6.4L HEMI V8)
• OEM Fluid Spec: Mopar ATF+4 (66RFE, 68RFE) or Mopar ASRC (Aisin AS69RC)
• Drain & Fill Capacity: ~7 quarts (68RFE) / ~8 quarts (Aisin AS69RC) - verify with dipstick
• Full Overhaul Capacity: 17.5 quarts (68RFE) / 16.5 quarts (Aisin AS69RC)
• Filter OEM Part Number: Verify with dealer or service manual (part numbers can be superseded)
• Recommended Service Interval: 30,000 miles (severe) to 60,000 miles (normal)

Fluid Type Explained

The 2016 Ram 3500 uses two primary, and very different, automatic transmission fluids depending on the transmission.

• 66RFE & 68RFE: These Ram-built transmissions require Mopar ATF+4. This is a synthetic fluid developed by Chrysler and is not interchangeable with other fluid types like Dexron or Mercon. Using a non-licensed ATF+4 fluid can lead to poor shift quality, torque converter clutch shudder, and ultimately, premature transmission failure.

• Aisin AS69RC: This heavy-duty Japanese transmission, paired with the High Output Cummins engine, requires a specific fluid meeting the Mopar ASRC specification. This is a unique fluid designed for the Aisin transmission's specific clutch materials and hydraulic requirements. It is not the same as ATF+4. Using ATF+4 in an Aisin transmission will cause significant damage.

Always confirm which transmission your truck is equipped with before purchasing fluid. This information can be found on the build sheet or by checking the shape of the transmission pan.

Service Procedure

There are two methods for servicing the transmission fluid:

• Drain and Fill: This is the most common and manufacturer-recommended procedure for routine maintenance. It involves draining the fluid from the transmission pan, replacing the filter(s), and refilling with fresh fluid. A standard drain and fill for a 68RFE or AS69RC typically replaces 7-8 quarts of fluid. This process does not change the fluid in the torque converter or cooler lines, leaving a significant amount of old fluid in the system.

• Full Fluid Exchange: A full exchange, often done with a machine at a service shop, connects to the transmission cooler lines and cycles out nearly all of the old fluid while pumping in new fluid. While this replaces a much higher percentage of the fluid, it must be done carefully. If the machine is not properly maintained or if the incorrect fluid is used, it can introduce contaminants or the wrong fluid type, causing damage.

For most owners, a regular drain, filter change, and fill is sufficient to maintain transmission health.

Service Interval

Ram specifies different service intervals based on how the truck is used.

• Normal Duty: For trucks that see mostly highway driving with light loads, a service interval of 60,000 miles is generally acceptable. This involves a fluid and filter change.

• Severe Duty / Towing: The vast majority of Ram 3500 owners fall into the "severe duty" category. This includes frequent towing (especially heavy loads), stop-and-go city driving, plowing snow, or operating in very hot or dusty environments. Under these conditions, the service interval should be shortened to 30,000 miles to prevent fluid breakdown and excessive wear.

Common Transmission Problems

• 68RFE: This transmission is known for torque converter clutch issues, often manifesting as a "shuttle shift" feeling between 4th and 5th gears. Overheating when towing heavy can also be a concern, making regular fluid changes critical. Some owners experience premature failure of the overdrive clutches, especially on modified or tuned trucks.

• Aisin AS69RC: Generally considered a very robust and reliable transmission. Most issues are minor and can be related to software or solenoids. Shift quality can sometimes be firm, which is normal for this heavy-duty unit. Using the incorrect fluid (like ATF+4) is the quickest way to cause major internal damage.

• 66RFE: This transmission, backing the HEMI V8, can sometimes have issues with delayed engagement into drive or reverse, and can experience similar torque converter issues as the 68RFE. Keeping the fluid clean and cool is essential for its longevity.

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