How many quarts does a 6.7 Cummins transmission take?

The typical total capacity you’ll encounter with a 6.7L Cummins equipped pickup is in the neighborhood of 14–15 quarts for a simple pan drain and fill, and roughly 18 quarts or more for a full system fill that includes the torque converter. Exact numbers vary by transmission model and year, so check your vehicle’s manual for the precise specification.

Common automatic transmissions paired with the 6.7 Cummins

The 6.7L Cummins has been paired with a few different automatic transmissions over its production run. The two most common configurations are the 68RFE and, in some later HD models, the AISIN AS69RC. Fluid capacity depends on the model, year, and whether you’re draining only the pan or performing a complete system flush that includes the torque converter and cooler lines.

• 68RFE (common in many Ram 2500/3500 trucks with earlier 6.7 Cummins): typical pan-fill capacity is about 13.5–14 quarts; total system capacity (including converter) generally falls in the 18–19 quart range.


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Note: These are typical ranges. Exact capacities depend on model year, transmission variant, and whether a full system flush (with converter and cooler circuit) is performed. Always verify with the service manual or VIN-specific specifications for your truck.

Practical figures to guide maintenance planning

To help plan a routine transmission service, consider the following representative figures. The figures below distinguish between a simple pan drain and fill and a full system flush that includes the torque converter. Use these as ballpark targets, then confirm with the manual for your exact configuration.

1. Pan drain and fill (no converter drained): about 13.5–14 quarts for 68RFE; about 14–15 quarts for AISIN AS69RC.


2. Full system capacity (including torque converter and cooler lines): roughly 18–19 quarts for 68RFE; about 18–20 quarts for AISIN AS69RC.

If you’re performing a maintenance service, plan for the higher figure if you’re doing a full flush and converter drain, and always add small amounts gradually, recheck levels, and follow the recommended fill procedure in your manual to avoid overfilling.

How to verify the correct capacity for your truck

Because the 6.7 Cummins can be paired with more than one automatic transmission across different model years, the most reliable way to confirm the precise fluid capacity is to consult:

• Your owner’s manual or the Ram/truck manufacturer service manual for the exact transmission model and year.


• The VIN- or model-specific technical guide from an official service portal or dealership parts department.

Manufacturers typically specify both the pan capacity and the total system capacity, along with the recommended automatic transmission fluid (ATF) specification. Using the wrong fluid or an incorrect quantity can affect shifting performance and longevity.

Summary

For most 6.7 Cummins trucks, a pan drain and fill typically uses about 14 quarts of ATF, while a full system refill (including the torque converter) sits around 18 quarts or more. The exact numbers depend on whether you have a 68RFE or AISIN AS69RC transmission and the vehicle’s year. Always reference the vehicle’s manual or VIN-specific guidance to determine the exact capacity for your truck.

How much transmission fluid does a 2014 Ram 2500 68RFE hold?

Ram 68RFE Cummins Diesel Transmission Fluid Capacity Notes
This application has a total dry transmission fluid fill capacity of 17.5 quarts or 16.5 liters.

What kind of transmission fluid does a 6.7 Cummins take?

The 6.7 Cummins transmission fluid type depends on the transmission installed: for the common 68RFE 6-speed automatic, use ATF+4 fluid. For the less common Aisin AS69RC 6-speed automatic, the correct fluid is the MOPAR ASRC fluid or a fluid that meets the Aisin T-IV / JWS 3309 specification. 
For the 68RFE transmission

• Fluid Type: ATF+4. 
• Specifications: This is the factory-recommended fluid for all 68RFE and 66RFE transmissions in the 6.7L Cummins. 
• Examples: Valvoline ATF+4, Mobil ATF+4, or other brands that meet the ATF+4 specification. 

For the Aisin AS69RC transmission

• Fluid Type: MOPAR ASRC Automatic Transmission Fluid or a fluid that meets the Aisin T-IV / JWS 3309 specification.
• Examples: Eurol ATF 1100 or other fluids specifically designed for Aisin transmissions that require the T-IV specification. 

How much transmission fluid does a 2019 Ram 2500 take?

The transmission fluid capacity for a 2019 Ram 2500 depends on the transmission type. For the 6-speed 68RFE, the service refill capacity is about 5.5-6.5 quarts with a total dry fill capacity of 17.5 quarts. For the 8-speed transmission (often paired with gasoline engines), the service refill capacity is approximately 4.5-5.0 liters, and the dry fill capacity is 8.5 liters. 
6-speed 68RFE transmission (common with 6.7L diesel) 

• Service refill capacity: 5.5-6.5 quarts
• Total dry fill capacity: 17.5 quarts 

This video demonstrates the 68RFE transmission fluid change process: 59sAdventure EndeavorYouTube · Apr 4, 2023
8-speed transmission (common with 6.4L Hemi) 

• Service refill capacity: 4.5-5.0 liters
• Total dry fill capacity: 8.5 liters 

This video shows how to change the transmission fluid for an 8-speed ZF transmission: 59sTyler PotterYouTube · Aug 19, 2024
Important notes

• Check your vehicle: It is always best to confirm your truck's specific transmission type, as capacities can vary.
• Service refill vs. dry fill: The service refill capacity is for a standard pan drop and filter change, while the dry fill capacity is for a complete overhaul where all components are drained.
• Fluid type: Ensure you use the correct type of transmission fluid, as specified in your owner's manual. 
• Filling the 8-speed: The 8-speed transmission does not have a dipstick, so you will need a fluid transfer pump to add fluid through the fill port. 

What kind of transmission fluid does a 68RFE take?

A 68RFE transmission takes ATF+4® specification fluid. While genuine Mopar fluid is a safe choice, many aftermarket brands that meet the ATF+4 specification can also be used. It is recommended to use a full synthetic fluid, especially in extreme climates, and some sources suggest using the cheapest ATF+4 you can find as expensive fluids may contain modifiers that could affect clutch performance.
 
Key fluid recommendations

• Specification: Look for fluids that explicitly state they meet the ATF+4 specification (MS-9602). 
• Brand: Genuine Mopar ATF+4 is a recommended and readily available option. Many reputable aftermarket brands also offer fluids that meet the ATF+4 specification. 
• Type: Full synthetic ATF+4 is often recommended, particularly for those who experience extreme temperatures. 
• Important note: Some sources advise against using more expensive, high-performance fluids, as they may contain additives that can negatively impact the holding power of the clutches in the transmission.