What transmission fluid goes in a 2007 Dodge Ram 2500 Cummins take?
The correct transmission fluid for a 2007 Dodge Ram 2500 with a Cummins engine depends on which transmission is installed. In short, older four-speed automatics use Dexron-compatible fluids, while the six-speed automatic uses ATF+4, and manual transmissions use a GL-4 gear oil. Always verify your specific transmission model if possible.
Identify your transmission to know the right fluid
To ensure you select the correct fluid, determine which transmission is in your truck by checking the transmission model tag, looking under the vehicle at the pan, or referencing the owner’s manual or build sheet.
- 48RE or 47RE (4-speed automatic, common with early 5.9L Cummins patterns)
- 68RFE (6-speed automatic, used with later configurations and some 2007-2009 models)
- NV5600 (manual transmission option)
Knowing the exact transmission helps you pick the appropriate fluid, avoid misfills, and maintain shifting quality and longevity.
Fluid recommendations by transmission type
48RE or 47RE (4-speed automatic)
Use a Dexron III-type automatic transmission fluid. Dexron VI is widely compatible with many Dexron III designs, but if you have the original 48RE/47RE spec, Dexron III (or an approved Dexron III-equivalent) is the safest choice. Synthetic variants are acceptable if they meet the Dexron III specification. Always confirm with your service manual or a dealer if you’re unsure.
68RFE (6-speed automatic)
Use ATF+4 automatic transmission fluid. This fluid is the Chrysler-approved specification for the 68RFE family and supports the later 2007-era six-speed transmissions. Do not substitute with Dexron III/VI unless explicitly approved by the manufacturer for your exact build.
NV5600 (manual transmission)
Use a GL-4 gear oil (not an automatic transmission fluid). Typical recommendations are 75W-90 or 80W-90 gear oil meeting GL-4 specifications. This differs from ATF and is essential for proper manual shift feel and gear longevity.
Additional tips for choosing and maintaining transmission fluid
Always consult the owner’s manual or a Mopar dealer for your exact VIN-based specification, especially for late-2000s models where production changes occurred. If you’re unsure, have the transmission identified by a qualified shop before purchasing fluid. Using the wrong fluid can impact shifting, cold-weather performance, and long-term reliability.
Summary
For a 2007 Dodge Ram 2500 with a Cummins engine, the fluid depends on the transmission type: 4-speed automatics (48RE/47RE) typically use Dexron III (with Dexron VI compatibility as a modern substitute per guidance), 6-speed automatics (68RFE) require ATF+4, and manual NV5600 transmissions call for GL-4 gear oil (75W-90 or 80W-90). Always verify your exact transmission model to confirm the correct specification.
