2016 Ram 2500 Transmission Fluid & Service

Quick answer

• Automatic Transmission (6.4L HEMI V8): Chrysler/Ram 66RFE 6-Speed Automatic
• Automatic Transmission (6.7L Cummins Turbo Diesel): Chrysler/Ram 68RFE 6-Speed Automatic
• OEM Fluid Specification: Mopar ATF+4 (MS-9602)
• Drain & Fill Capacity: Approximately 6.5 quarts (6.2 liters) for 66RFE/68RFE
• Full Overhaul Capacity: 17.5 quarts (16.6 liters) for 68RFE; 12.0 quarts (11.4 liters) for 66RFE
• Filter OEM Part Number: Verify with dealer or service manual, but common part numbers include Mopar 5013457AA (sump filter) and Mopar 68172552AA (spin-on cooler line filter, 68RFE only).
• Recommended Service Interval: 60,000 miles (severe duty) to 120,000 miles (normal duty).

Fluid type explained

The 66RFE and 68RFE automatic transmissions in the 2016 Ram 2500 are specified to use Mopar ATF+4 fluid, which meets Chrysler's MS-9602 material standard. This is a full-synthetic fluid developed specifically for Chrysler transmissions.

Using a fluid other than ATF+4 can lead to significant problems. Generic "multi-vehicle" fluids may not have the correct frictional properties, leading to harsh or delayed shifts, torque converter clutch shudder, and premature clutch wear. The additives in ATF+4 are designed to provide stable performance across a wide temperature range and maintain their protective qualities for a long service life. Always insist on ATF+4 or a licensed equivalent that explicitly meets the MS-9602 specification.

Service procedure

Servicing your Ram's transmission involves more than just swapping out the fluid. There are two primary methods:

• Drain and Fill: This is the most common and manufacturer-recommended procedure. It involves dropping the transmission pan, draining the 6-7 quarts of fluid contained within it, replacing the sump filter (and the spin-on filter for the 68RFE), cleaning the pan magnet, and reinstalling the pan with a new gasket. The transmission is then refilled with fresh fluid. This process replaces about half of the total fluid in the system, as a significant amount remains in the torque converter and cooler lines.

• Full Fluid Exchange: This service uses a specialized machine to connect to the transmission cooler lines. The machine pumps new fluid into the system while simultaneously capturing the old fluid as it exits. This method replaces nearly 100% of the old, degraded fluid. While more thorough, it's crucial that the service is performed correctly. The transmission should never be "flushed" with harsh chemicals, only exchanged with the correct ATF+4 fluid. Most experts recommend performing a filter change in conjunction with a fluid exchange.

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

Service interval

Ram specifies two different service intervals based on vehicle usage:

• Normal Duty: For vehicles that see primarily highway driving without heavy loads, Chrysler suggests a fluid and filter change at 120,000 miles.

• Severe Duty: This is the interval most Ram 2500 owners should follow. Severe duty includes frequent towing, heavy hauling, stop-and-go city driving, extensive idling, or operating in dusty or mountainous environments. Under these conditions, the fluid and filter(s) should be changed every 60,000 miles to prevent premature wear and overheating.

Given the capabilities and typical use cases of a heavy-duty truck, adhering to the 60,000-mile interval is the safest way to ensure a long and reliable service life from your transmission.

Common transmission problems

While generally robust, the 66RFE and 68RFE transmissions can experience issues, often exacerbated by delayed service or heavy use.

• Torque Converter Issues: The 68RFE, in particular, can have issues with the torque converter clutch, leading to shuddering or slipping, especially when under load or with added power from aftermarket tuning.
• Solenoid Pack Failure: The solenoid pack, which controls shifting, can fail, leading to erratic shifting, being stuck in one gear (limp mode), or a no-start condition. Diagnostic trouble codes will typically point to this component.
• Overheating: Towing heavy loads on steep grades without proper monitoring can cause the transmission fluid to overheat. Degraded and overheated fluid loses its ability to lubricate and cool, accelerating wear on all internal components.

Regularly servicing the transmission with the correct fluid and filters is the single most effective way to prevent these common problems.

Find a trusted shop on Repairius.