Few modern diesel trucks have earned as much love and respect as the 4th Generation Ram 2500 & 3500, built from 2010 through 2018 and powered by the legendary 6.7L Cummins.
This era of Ram trucks represents a sweet spot for many diesel enthusiasts — combining classic Cummins reliability with modern comfort, serious towing ability, and massive upgrade potential.
Whether you see them daily on the highway or dominating diesel events, there’s a reason why the 4th Gen Cummins has such a devoted following. Let’s break it down 👇
1. The 6.7L Cummins: Proven Power and Simplicity
The 4th Gen Rams continued to use the 6.7L Cummins inline-six — an engine platform known for its strength, low-end torque, and durability. Unlike some competitors, the Cummins design favors a straight-six layout with fewer moving parts and a stout bottom end.
- 4th Gens used the tried-and-true CP3 injection pump—a favorite among enthusiasts for its longevity and upgradeability.
- Paired with either the 68RFE or Aisin automatic; or the G56 manual transmission , these trucks offer a wide range of setups for towing, work, or performance builds.
- Factory power climbed steadily throughout the generation, reaching up to 385 HP and 900+ lb-ft towards the end of 4th Gen Cummins production.
This combination of strong factory performance and proven mechanicals makes these trucks a go-to platform for daily drivers and performance builds alike.
2. Tuning & Upgrade Potential
4th Gen Cummins trucks strike a unique balance between modern technology and tuneability.
Compared to newer 5th Gen models (especially 2022+), their ECMs are extremely easy to access, which makes tuning and performance upgrades easy.
- Performance upgrades are available from nearly every reputable diesel performance brand.
- Compound turbo and 2nd Gen swap kits with S300 or S400 turbos for improved power potential are very common and easily accessible.
- Quality and ECM issues with the 5th Gen Cummins (2019+) engines make the 4th Gen a fan-favorite for building horsepower.
This era of Cummins trucks is often described as the “last easily tuneable generation,” which adds to their popularity.
3. Classic Styling with Modern Comfort
The 4th Gen Ram brought a huge leap forward in interior quality and styling compared to earlier 3rd Gens. Ram trucks of this era introduced features like:
- Much-improved cabin materials and insulation
- Uconnect infotainment with modern navigation and Bluetooth
- Comfortable seating and quiet highway manners
Meanwhile, the exterior design remains timeless— bold grille, muscular body lines, and a stance that looks great, stock, lowered, or lifted. Many enthusiasts consider 4th Gen Rams to be one of the best-looking modern diesel trucks on the road.
4. Legendary Towing Capability
The 2010–2018 Ram HD lineup took big strides in towing performance, with ratings reaching up to 30,000 lbs in later models when properly equipped. Key improvements include:
- Stronger frames and axles
- Factory exhaust brakes that make towing safer and easier
- Optional rear air suspension on later models for improved load handling
For work or play, 4th Gen Cummins trucks remain a favorite for those who need to get the job done.
5. Huge Aftermarket Support
One of the biggest reasons for the 4th Gen’s enduring popularity is the massive aftermarket ecosystem. Whether you want to build a reliable daily, a lifted show truck, or a 1,000+ HP street machine, parts are everywhere:
- Suspension kits, leveling kits, and lift kits for any stance you want
- Turbo kits, injectors, transmissions, tuning, and fuel systems for power builds
- Lighting, interior upgrades, and armor for customization
Brands like FASS, BDS, Industrial Injection, S&S Diesel and more make supporting upgrades simple — and the FASS Motorsports team can help you put together a package that fits your goals*.
*Please note: Due to federal regulations, FASS Motorsports does not advertise or sell emissions-off performance parts for the 6.7 Cummins—period.
The Sweet Spot for Diesel Enthusiasts
The 4th Gen Cummins (2010–2018) represents a golden era: modern enough to be comfortable and capable, but still simple and tuneable enough to appeal to true diesel enthusiasts. These trucks have proven their durability and continue to dominate races, shows, and work sites alike.
How FASS Motorsports Can Help
At FASS Motorsports in Washington, Missouri, we work with 4th Gen Cummins owners every day.
From FASS Diesel Fuel Systems and suspension kits to lighting, wheels, and tires — we stock the parts and provide expert installation for trucks in Franklin County and the Greater St. Louis area.
👉 Shop 4th Gen Cummins parts online
👉 Visit our showroom in Washington, MO for expert advice & installation
Questions? We’re Here to Help.
- Phone: (636) 429-7020
- Email: info@fassmotorsports.com
FASS Motorsports
25 Town and Country Drive
Washington, MO 63090