2020 Ram 2500 Transmission Fluid & Service

Quick Answer

• Transmission Make/Model: Aisin AS69RC
• OEM Fluid Spec: Mopar AS69RC ATF (SAE 0W-20, MS-11340)
• Drain & Fill Capacity: Approximately 7-8 quarts
• Full Overhaul Capacity: Approximately 17.5 quarts (16.6 liters)
• Filter OEM Part Number: Please verify with your dealer or service manual. There are typically internal and external filters for the AS69RC.
• Recommended Service Interval:
  • Normal Duty: 60,000 miles (100,000 km)
  • Severe Duty/Towing: 30,000 miles (50,000 km)

Fluid Type Explained

The 2020 Ram 2500, when equipped with the 6.7L Cummins turbo diesel engine, typically utilizes the Aisin AS69RC 6-speed automatic transmission. This heavy-duty transmission requires a specific type of fluid to ensure its longevity and proper operation. The manufacturer-recommended fluid is Mopar AS69RC ATF, which meets the MS-11340 specification. This is a low-viscosity, synthetic fluid designed to operate efficiently under the high temperatures and heavy loads often experienced by trucks like the Ram 2500.

It's crucial to use only the specified Mopar fluid or an approved equivalent that explicitly states it meets the MS-11340 standard. Using the wrong fluid can lead to premature wear, shuddering, hard shifts, and potentially catastrophic transmission failure. These transmissions are precisely engineered, and the fluid's viscosity, additive package, and frictional properties are critical for proper clutch engagement, lubrication, and heat dissipation.

Service Procedure

Servicing the Aisin AS69RC transmission can be done via two primary methods: a drain and fill, or a full fluid exchange (flush).

Drain & Fill

A drain and fill involves removing the transmission pan, allowing the fluid to drain out, replacing the filter(s), and then refilling the transmission with new fluid to the correct level. This method only replaces a portion of the total transmission fluid, typically around 7-8 quarts, as a significant amount remains in the torque converter, valve body, and cooler lines. While simpler and less expensive, it doesn't completely remove all old, contaminated fluid. For this reason, many recommend more frequent drain and fill services as an alternative to less frequent full exchanges.

Performing a drain and fill often involves:

1. Warm-up: Drive the vehicle until the transmission is at operating temperature.
2. Drain: With the vehicle safely lifted and level, place a drain pan under the transmission. Remove the drain plug (if equipped) or carefully remove the transmission pan bolts to allow the fluid to drain. Be prepared for a mess and avoid hot fluid contact.
3. Filter Replacement: Remove and replace the internal transmission filter(s). The AS69RC typically has both an internal pan filter and an external spin-on filter (similar to an oil filter) located on the driver's side of the transmission.
4. Pan Installation: Clean the transmission pan and magnet(s). Install a new pan gasket (if applicable) and reattach the pan, tightening bolts to the manufacturer's torque specifications.
5. Refill: Using a pump or funnel, add new Mopar AS69RC ATF through the dipstick tube or fill port. Start with an amount slightly less than the drain volume.
6. Check Level: Start the engine, cycle through all gear ranges (P, R, N, D), and allow the transmission to reach operating temperature. With the engine running and the vehicle level, carefully check the fluid level using the dipstick (if equipped) or by following the manufacturer's specific level check procedure. Add fluid in small increments until the correct level is achieved.

Full Fluid Exchange (Flush)

A full fluid exchange typically involves a specialized machine that connects to the transmission cooler lines. This machine simultaneously pushes new fluid into the transmission while extracting old fluid, ensuring nearly all old fluid is replaced. This method is more comprehensive but requires specialized equipment found at most dealerships and reputable transmission shops.

While a full flush can be beneficial for replacing all old fluid, it's important that it