2008 Dodge Ram 2500 6.7 Cummins Specs 2026 Quick Reference
Quick Answer
The 2008 Dodge Ram 2500 equipped with the 6.7L Cummins turbo-diesel features an output of 350 horsepower and 650 lb-ft of torque. Towing capacities range from 12,000 to over 16,000 lbs depending on axle ratios and cab configurations. Always verify your specific towing capacity by checking the vehicle’s unique door-jamb payload sticker and GCWR, as these values fluctuate significantly based on individual truck equipment.
The 2008 Dodge Ram 2500 6.7 Cummins represents a pivotal bridge in diesel truck history, serving as a transitional platform that introduced advanced emissions hardware to the proven Cummins architecture. Moving away from the mechanical simplicity of the 5.9L engine, this model year adopted the 6.7L displacement while integrating a Diesel Particulate Filter (DPF) and Exhaust Gas Recirculation (EGR) system. Many owners struggle to distinguish the early emissions hardware of the 2008 model from later, more complex DEF-equipped systems. This guide provides exact factory specifications, maintenance protocols for the 6.7L powertrain, and the technical clarity needed to keep your 3rd Gen Ram running at peak efficiency.
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Start 6 Months FreeThis document covers the 2008 Ram 2500 Heavy Duty series equipped with the 6.7L Cummins Turbo Diesel. Specifications are based on factory service manuals and original manufacturer guides. Last reviewed: August 2026. Always verify your specific vehicle’s payload and towing capacity via the driver-side door jamb sticker.
2008 Dodge Ram 2500 6.7 Cummins Specs and Technical Data Table
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Verified Factory Specification Matrix
| Component | Specification | Notes |
|---|---|---|
| Engine Output | 350 HP / 650 lb-ft | Factory rated @ 3013 RPM |
| Transmission | 68RFE / G56 | Automatic or 6-Speed Manual |
| Emissions System | DPF & EGR | No DEF/AdBlue required |
| Front Axle | Solid Beam | Coil spring, 5-link setup |
350 HP
650 lb-ft
Understanding the 2008 6.7 Cummins Emissions System Requirements
What the DPF Does for Your 6.7 Cummins
The 2008 model year marked the transition to a Diesel Particulate Filter (DPF) system. Unlike modern trucks that utilize Selective Catalytic Reduction (SCR) via Diesel Exhaust Fluid (DEF) to reduce NOx, the 2008 6.7L Cummins relies on its DPF and high-pressure cooled Exhaust Gas Recirculation (EGR) to manage soot levels. The DPF traps particulate matter and periodically undergoes a “regeneration” cycle, where the engine increases exhaust temperatures to burn off collected soot.
Maintaining the EGR Valve and Cooler Assembly
Because the 6.7L engine processes exhaust gases to lower combustion temperatures, the EGR valve and cooler are prone to carbon buildup. In many instances, the valve can stick if the truck is used primarily for short, city-driving trips where the engine never reaches optimal operating temperature for sustained periods.
This is a pre-DEF system. Do not attempt to add Diesel Exhaust Fluid to your fuel or any other reservoir; this system relies purely on the thermal management of the DPF.
Mechanical Performance and Maintenance of 2008 Ram 2500 Components
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Maintaining the 68RFE and G56 Transmission
The 2008 model offered the 68RFE 6-speed automatic transmission and the G56 6-speed manual. The 68RFE requires strict adherence to fluid change intervals (typically every 30,000 miles for severe service) to prevent valve body issues. The G56, while robust, often exhibits a “rolling” sound at idle due to the lightweight flywheel and requires high-quality, synthetic gear oil to minimize bearing wear.
Addressing 3rd Gen Solid Front Axle Steering Wear
The 3rd Generation Ram 2500 is legendary for its solid front axle, which provides exceptional load-carrying capability. However, the factory steering linkages are known to wear prematurely.
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Steering Inspection Checklist
Inspect the track bar bushings for play, which often causes the “death wobble” effect on 3rd Gen trucks.
Check for looseness in the ball joints at every oil change; look for cracked grease boots.
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Listen Free for 30 DaysComparative Performance: 2008 6.7 Cummins vs Competitors
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The 2008 6.7L Cummins platform is frequently favored by towing enthusiasts for its high torque output at low RPM and the inherent durability of the Cummins engine block. When compared to the Ford 6.4L Powerstroke of the same era, the Cummins is often cited for its simpler internal architecture, despite the common maintenance requirements of the early DPF/EGR emissions systems.
Conclusion
The 2008 Dodge Ram 2500 6.7 Cummins remains a workhorse of the modern diesel era. Key takeaways for owners include:
- The 6.7 Cummins delivers 350hp and 650lb-ft of torque, providing excellent towing utility.
- Emissions are managed exclusively through DPF and EGR hardware, with no DEF required.
- Steering component maintenance, particularly of the track bar and tie rods, is essential to preserve the handling characteristics of the solid front axle.
- Always verify specific GCWR and payload limits via your truck’s unique door sticker, as these vary based on cab configuration and axle gearing.
We strongly advise referencing your factory service manual and confirming all component specifications against your specific VIN before performing maintenance or selecting aftermarket upgrades. Regular, preventative maintenance on the emissions control system is the most effective way to ensure long-term reliability.
2008 Dodge Ram 2500 6.7 Cummins Specs: Frequently Asked Questions
Does the 2008 6.7 Cummins require DEF?
No, the 2008 Dodge Ram 2500 6.7 Cummins does not use Diesel Exhaust Fluid (DEF). The 2008 model year utilized an Exhaust Gas Recirculation (EGR) valve and a Diesel Particulate Filter (DPF) to meet emissions requirements. Selective Catalytic Reduction (SCR) technology, which requires the addition of DEF, was not implemented on the Ram Cummins platform until the 2013 model year.
Is the 6.7 better than the 5.9 Cummins?
Whether the 6.7 is ‘better’ depends on your priority. The 5.9L is revered for its simplicity, fuel efficiency, and lack of complex emissions equipment. However, the 6.7L provides significantly more torque, a quieter engine, and an exhaust brake feature that is invaluable for towing heavy loads. While the 6.7 has more emissions-related components to maintain, it is a more capable platform for modern, high-output towing requirements.
What are common EGR/DPF issues on 2008 models?
Common issues include carbon buildup in the EGR valve and cooler, which can lead to restricted airflow and engine codes. The DPF can become clogged if the truck is primarily used for short trips, as it requires sustained highway speeds to enter a ‘regeneration’ cycle and burn off soot. These issues are often exacerbated by idling for extended periods or using fuel that does not meet modern standards.
What is the towing capacity of an ’08 2500?
The maximum towing capacity for a 2008 Ram 2500 6.7L typically ranges between 12,000 and 16,000 pounds. This value varies wildly based on your specific truck’s rear axle ratio (3.73 vs. 4.10), transmission type (automatic vs. manual), and whether the truck is a 2WD or 4WD configuration. Always check your specific GCWR and payload sticker to avoid exceeding the safety limits of your truck’s chassis.
How many miles can a 6.7 Cummins last?
The 6.7L Cummins engine is designed for commercial-grade longevity and can easily exceed 300,000 to 400,000 miles with proper maintenance. Key factors in achieving high mileage include religious adherence to oil change intervals, keeping the cooling system in top shape, and ensuring the fuel filtration system is serviced to protect the common rail injection components. Neglect of the emissions system is the most common cause of premature engine-related downtime.
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