Everything You Wanted to Know About the Cummins 6.7L Diesel Engine

Countless drivers of RAM pickups have become familiar with the joys of owning a truck with the Cummins Diesel engine. These powerful units have been driving some of America’s most rugged and durable trucks for more than 30 years, a collaboration that started back when trucks were still produced under the Dodge label.  Even today, the relationship between RAM and Cummins still goes strong.

So, let’s look at the RAM Cummins engine, specifically the 6.7L Diesel engine, to find out more about what makes it tick in both the fourth and fifth generations of RAM pickup trucks.  This information is essential, whether you are just curious about the RAM Cummins combo or are shopping for a used RAM pickup truck,

About Cummins

Cummins was initially founded in 1919 as the Cummins Engine Company, but after 2001 restructured as simply Cummins. Headquartered in Columbus, Indiana, Cummins is a global company with operations as far afield as India and China. As it turns out, powerful Diesel engines like the Cummins 6.7L are welcome no matter what language you speak!

The founders were J. Irwin Miller, a local banker in Columbus, and mechanic Clessie Cummins for whom the engines and company are named. Even though their earliest Diesel engines were effective, the company didn’t find success until 1933 with the Model H, used in railroad equipment.

In addition to being the powerplants for RAM trucks, Cummins Diesels can also be found in heavy trucks, buses, and RVs.  These engines even power, marine craft, construction equipment, and Bradley fighting vehicles. Cummins engines are everywhere.  Dodge started using the engines back in 1989, the first of which was the 12V Cummins with 160 horsepower (HP) and 400 lb-ft of torque.

Right now, Cummins employs some 58,000 employees around the world and has been named among the Top 25 Most Responsible Companies in 2021 by Newsweek.  Even in the difficult times of 2020, Cummins reported $19.8 billion in revenue.

Cummins 6.7L Diesel Engine Specifications

Below are a few key standard specs for the Cummins 6.7L

Horsepower: 370 (max. 420 HP)

Torque: 850 lb-ft (max. 1075 lb-ft)

Cylinders: 6

Bore: 4.21 inches

Stroke: 4.88 inches

Alternator: 220 amps

Throttle: Electronically controlled

Net weight: 1,071 lbs

Fuel System: Bosch HPCR

Let’s take a closer at the Cummins 6.7L Diesel in RAM trucks.

RAM Cummins – Use of the Cummins 6.7L in Fourth-Generation RAM Trucks

The fourth generation of RAM trucks, launched in 2009, made use of the Cummins 6.7L Diesel engine:

2010-2012 RAM 2500 and 3500

2012 Ram 2500, Image By Motor Trend

In the early period of the fourth generation, Dodge customers wanting a bigger 2500 or 3500 truck had the choice of just two models that carried the impressive 6.7L. Others opted for the 1500 with smaller engine options or the 2500/3500, but with one of those Hemi V8 engines you might have heard about.

The 2010-2012 RAM 2500 and 3500 came with the standard output 6.7L, which delivered 350 HP and 650 lb-ft of torque. In mid-2011, however, these six-speed automatic transmission models could be equipped with an upgraded Cummins and a higher torque output of 800 lb-ft.

2013-2019 RAM 2500 and 3500

2019 ram 3500, Cummins Diesel Engine
2019 Ram 3500, Image by Motor Trend

By 2013, those seeking more 6.7L options got their wish with the 2013-2019 RAM 2500 and 3500 trucks that could be equipped with both manual and automatic transmissions.

The automatic models proved the most popular with torque-hungry gearheads, outputting up to 1000 lb-ft in the 2019 RAM 2500/3500 equipped with the 6.7L Cummins Diesel Aisin ASC69RC Automatic version.

The 68RFE (automatic only) version in 2019 was also potent, outputting 850 lb-ft of torque.

2010-2018 RAM Chassis Cab

Cummins Diesel Engine
Ram Chassis Cab, Image by Michael Simari, Car and Driver

Each of the two versions of the fourth-generation RAM 2500/3500 Chassis Cab was powered by a 6.7L Cummins diesel.

  • 2010-2012 model – used a standard Cummins 6.7L inline-six with 305 HP and 610 lb-ft torque
  • 2013-2018 had two choices: the six-speed manual (325 HP; 650 lb-ft torque) and the Aisin AS69RC automatic (325 HP; 750 lb-ft torque)

Check out this 2015 RAM Tradesman 4WD with Cummins Diesel

RAM Cummins Engine – Use of Cummins 6.7L in 5th-Generation RAM Trucks

Launched for the 2019 model year, the fifth-generation is the latest version of RAM trucks.  

The keyword for this fifth generation is “Heavy Duty,” as these models would continue with the 6.7L Cummins Diesel engine under the hood.

This applies to all RAM 2500, 3500, and 5500 models (Chassis Cab), but there is one exception. Anyone eyeing up the RAM 2500 Power Wagon needs to know that, unfortunately, the Cummins Diesel engine is not available. This RAM is only available with the gas-powered 6.4L V8 HEMI.

Here’s a rundown of models and trims in the fifth generation:

  • RAM 2500 – Tradesman, Big Horn and Laramie
  • RAM 3500 – Tradesman, Big Horn, Laramie, Limited Longhorn
  • RAM Chassis Cab – Tradesman, SLT, Laramie, Limited

Just before you sign your name on the dotted line for your very own RAM, you should know that in the fifth-generation models, the Cummins 6.7L Diesel is not always the standard engine option but rather the upgrade. Don’t assume there’s a Diesel under the hood.

RAM Cummins: What’s the Benefit?

To wrap up this exploration of RAM and Cummins, let’s reflect a little on why this 30-year partnership remains so strong.

First of all, no matter how much the world wants to electrify and move away from hydrocarbons, there’s just something so irresistible about a powerful turbo-diesel. They’re almost impossible to stall and, when properly maintained, can last almost forever.

Next, the torque and pull of these engines can never be paralleled by any gasoline or hybrid option…unless you cheat and pick some extreme sports car engine (but we’ll save the discussion about the RAM TRX for another occasion). The power of a Diesel is even more evident when hauling or towing heavy loads.  Not to mention, Diesel power is still well-suited for off-road driving or daily driver duty on ordinary streets and highway driving. These are the secrets of the RAM-Cummins partnership. Long may it continue.

Looking for a used RAM Cummins 2500 or another RAM Diesel model?   Then Explore Our Huge Selection of Used RAM Cummins pickup trucks for sale.  Please note that our inventory changes frequently and is subject to prior sale. Be sure to ask us about incoming used RAM Cummins models.

Buy a Used RAM Cummins Diesel at Trust Auto

Truck buyers from far and wide have discovered how easily used RAM Cummins shopping is at Trust Auto.  From our vast selection of RAM 1500, RAM 2500, and RAM 3500 trucks to our professional staff who are well-versed in all things Cummins Diesel, Trust Auto in Sykesville is the trusted choice for truck shoppers. 

Buying a used truck in Virginia? Buying a used pickup in Washington, DC? Then the best used vehicles are just a short drive away. Buying a used truck in Pennsylvania? Buying a used truck in New York? Then learn how our remote shopping services can help you find the perfect vehicle without ever leaving home. 

When your search calls for the best-used car dealership near me, Trust Auto is the answer. From Baltimore and beyond, we’re the used truck dealer that makes things easy. Call or stop by today to explore our extensive selection of high-quality vehicles.

Chevrolet Corvette: What You Need To Know

For almost 70 years, the Chevrolet Corvette has stood at the top of America’s sports car pyramid. Sure, the Ford Mustang, Dodge Challenger, and Chevrolet Camaro, among others, are exceptional performance cars in their own rights. Yet, the Corvette has never gone out of production, like the Challenger and Camaro, or been reinterpreted as a neutered economy car, like the second-generation Mustang in the 1970s.

You can also argue that the Ford GT and GT40 supercars out-perform ordinary Corvettes. However, these Ford vehicles were expensive, limited production models, whereas the Corvette is a sports car for everyman. It’s this accessibility that makes used Corvettes so popular among enthusiasts and collectors. Add in relatively straightforward mechanicals and readily available parts, and it’s easy to see why Vettes remain popular in the used car scene.

So whether you are considering a Corvette for the first time or have drooled over one from high school days, knowing a thing or two about this Chevy can help your search of used Corvettes for sale. Of course, numerous authors have written extensive books about the Corvette, but we’ll keep things simple with a look at the essentials. We’ll begin with a brief history of how the Corvette came into being and a quick overview of classic Vettes from the 20th century. However, we’ll dive a bit deeper into 21st-century models that are ideal for daily driver duty and weekend adventures.  

The Origins of the Chevrolet Corvette

Seeking to cash in on the post-World War II boom times in the U.S., General Motors looked to create a halo car that was vastly different than anything on the market. This was also an era when millions of American soldiers had returned home after seeing small European roadsters from Austin, Triumph, and a host of other brands.  

Keeping this in mind, but seeking something better suited for more spacious roads and American tastes, Chevrolet introduced a plus-sized (compared to Europe’s tiny convertibles) roadster in 1953. Named after a small and maneuverable navy ship, the first-generation Corvette was available only as a convertible. Chevrolet made the Corvette’s body from fiberglass instead of steel to reduce weight and improve performance, a first for a major automaker. This tradition of a non-metal exterior continues into today as Corvette bodies now mainly consist of plastic composite. 

20th-Century Corvette Generations

Corvette C1: 1953–1962

The first-generation Corvette is among a handful of quintessential cars that captured the free-spirited and driver-oriented lifestyle of the 1950s. Suburbs were booming, and families were growing, but some drivers wanted nothing to do with boring hardtop coupes or four-door sedans. The C1 started out with an inline six-cylinder, but a few years into production, Chevy swapped this engine out for a V-8 and never looked back.  

Chevrolet Corvette C1 – 1954

Corvette C2: 1963–1967

Facing competition from the first generation Ford Thunderbird, Chevy engineers sought to create a new Corvette that would not only stand out in a sea of convertibles and coupes but emphasize speed and performance. In 1963, the all-new Corvette coupe also launched a legendary name, Sting Ray (which would later become Stingray in the C3). The first-year C2 would also be well known for another reason, the split rear window. This window design would disappear in future C2s making the ‘63 Vette a highly collectible car. A convertible version of the C2 was available, and generational improvements eventually included an L88 engine making 430 horsepower (HP).

1963 Chevrolet Corvette Sting Ray Z06 (C2); Image by Top Car Ratings

Corvette C3: 1968–1982

While still based on C2 mechanicals, the redesigned C3 is known for several firsts. These accomplishments include the first use of T-tops on a Corvette and the release of specialty models like the ZR-1 and Z07. The venerable 350 cubic-inch V-8 became standard power, and engine upgrades included the LT1 making 370 HP and a 454 cubic-inch big-block rated for 390 HP. In 1981, production moved to a Corvette-exclusive facility in Kentucky that remains the sole factory for building Corvettes. It’s noteworthy that the C3 has the longest run of any Corvette generation. 

Chevrolet Corvette C3 1982 – Image By DriveMag

Corvette C4: 1984–1996

Given the longevity of the C3, General Motors wanted a top-to-bottom redesign for the C4 Corvette. This complete do-over meant there was no consumer edition of the Corvette for 1983, but a few test vehicles carried the 1983 model year designation. So, technically, Corvette production has never skipped a year. High-tech features like digital instrumentation meant the Corvette was ready for the future while a sleek, all-new design still gave hints about the car’s heritage. The C4 generation saw noteworthy variants, including the ZR-1, 40th Anniversary edition, and the Grand Sport.  

Chevrolet Corvette C4 1996 – Image By Car and Driver

Corvette C5: 1997–2004

Following another long run of Corvettes with the C4, GM again launched an all-new Vette for 1997 with the C5. Angular body shapes gave way to a curvy yet muscular exterior that produced an impressive 0.29 drag coefficient. Other improvements included a near-perfect weight distribution close to 50-50. Other engineering advancements centered on the new small-block LS1 V-8 that would produce 350 HP. The same engine would serve as the base for the LS6 engine used in the Z06 Corvette, which eventually reached 405 HP in the later years of the C5. Because of its modern design, inside and out, the C5 was the perfect Corvette to bridge two centuries.

Chevrolet Corvette C5 2004 – Image by Pinterest

21st-Century Corvette Generations

Corvette C6: 2005–2013

For the most part, the sixth-generation Corvette is considered a reworked C5, and that’s a good thing. The redesigned body combined with mechanicals largely carried over from its predecessor means the C6 has a rock-solid reputation for reliability. For many enthusiasts, the C6 is the “sweet spot” for Corvette ownership. It’s new enough to benefit from modern technology, has a design that still comes across as contemporary, and benefits from a decent amount of depreciation.  

Depending on the model year, base engine power (coming from the 6.0-liter LS2 V-8) is rated for 400-430 HP. Step up to the Corvette Z06, and you’ll be treated to 505 HP and 470 lb-ft of torque thanks to a 7.0-liter V-8. Ultimate C6 performance comes in the form of the Corvette Z51, which includes numerous performance and suspension upgrades centered around a supercharged 6.2-liter V-8 making 638 HP and 604 lb-ft of torque. Mashing the accelerator on a ZR1 can mean hitting 60 mph from a standstill in 3.8 seconds. This is supercar territory.

Discover a 2007 Chevrolet Corvette Z06 2LZ

Chevrolet Corvette C6 2013 – Image By Hall Tech Systems

Corvette C7: 2014–2019

Chevy used a clean slate when redesigning the seventh-generation Vette to attract a more youthful Corvette customer. The C7’s in-your-face looks are hard to ignore, and that’s precisely what GM wanted. Along with the Corvette’s traditional dollar-per-horsepower value now comes a refined and sophisticated sports car that could proudly stand against same-class vehicles from Europe and Japan. Everything about the C7 was better than its predecessors: performance, handling, and amenities. We also see the return of the Stingray label as the Corvette C7 could be purchased in base Stingray, Stingray Z51, or Stingray Z06 trim. Starting with the 2017 model year, the Corvette was available in a Grand Sport trim that featured more aerodynamic bodywork and track-focused mechanicals. 

Corvette C7 power begins with the 6.2-liter V-8 making 455 HP and 460 lb-ft of torque for the Stingray and Stingray Z51. Step up to the Corvette Stingray Z06, and this V-8 becomes supercharged and cranks out 650 HP and 650 lb-ft of torque. Of course, the ultimate C7 experience is all about the ZR1 and a neck-snapping 755 HP and 715 lb-ft of torque.

Learn about this 2014 Chevrolet Corvette Stingray 3LT with Z51 Performance Package

Chevrolet Corvette C7 2019 – Image By Motor 1

Corvette C8: 2020–present

The idea of a mid-engined Corvette dates back to the early days of the car’s creation, but the concept never became a reality until the launch of the C8. Finally, the Vette has a configuration equal to the world’s best sports cars like Ferrari, Lamborghini, and McLaren. Along with the most radical redesign in the car’s history comes a significant upgrade in refinement and attention to detail. Yet, the C8’s secret sauce is engineering similar to more exotic offerings but is still well-suited for everyday use. A great “bang for your buck” has always been a Corvette hallmark. The Stingray label returns for the eighth-generation Corvette, as do the 1LT, 2LT, and 3LT trim levels.  

With the mid-engine C8, we can no longer talk about what’s “under the hood” but instead have to say “under the rear deck.” Power comes from a reworked 6.2-liter V-8 that began as the LT1 in the C7 Vette. Now called the LT2, this engine makes 490 HP and 465 lb-ft of torque. Step up to the Z51 Performance package, and the horsepower is bumped up by five. Car and Driver reports a mind-blowing 2.8 seconds for the C8 to hit 60 mph from a standstill. Amazingly, Chevy is working on even faster variants as industry rumors expect Z06 and ZR1 Corvettes to hit the streets in the coming years.

Check Out this 2020 Chevrolet Corvette 3LT with Z51 Performance Package

Chevrolet Corvette C8 2020 – Image By Motor Trend

Understanding Corvette Models and Trim Levels.

Even long-time Corvette fans can be overwhelmed by the alphabet soup of available configurations. For example, in the C8, LT2 refers to the engine, while 2LT is the trim level. We’ll look at some general explanations of Corvette trims and configurations from the most recent generations to reduce confusion. Specific equipment will vary from generation to generation and year to year, but here’s a brief overview.

Corvette 1LT: 1LT is the base trim level for a Corvette and includes all standard equipment. For the C8, the standard Vette is the Stingray 1LT.  

Corvette 2LT: As the mid-tier trim, a 2LT Vette typically benefits from seat and technology upgrades.  

Corvette 3LT: A Vette in 3LT trim signifies a car with all the bells and whistles, including top-line cabin materials and all the extras found in the 2LT. Some years of the C6 had a 4LT trim level.

Stingray: The Stingray term dates back to the early years of the Vette and has been used off and on as a name added to the Corvette. In the case of the C7 and C8, Stingray applies to the base model.

Z51 Performance:  Almost worthy of being its own trim level, the storied Z51 option has always been about making the Corvette even more of a driver’s car. Package features may include improved wheels and tires, upgraded brakes and suspension, and enhanced engine output. For many, the Stingray Z51 2LT is the perfect match of features and performance.

Z06: Depending on our perspective, the Z06 is either a full-fledged Corvette model or an add-on package. No matter how you look at it, a Z06 is centered around an engine upgrade that goes well beyond base model performance. Varying by year, the Z06 may also have its own trim level options that differ from the standard LT range.

ZR1: The ZR1 is the ultimate Corvette model that usually makes the Z06 look tame by comparison. Over-the-top horsepower is just one ZR1 signature that goes hand-in-hand with unique chassis and brake upgrades.  

Looking for a used Stingray Z06 3LT or another model?   Then Look At Our Huge Selection of Used Chevrolet Corvettes for Sale  Please note that our inventory changes frequently and is subject to prior sale. Be sure to ask us about incoming used Chevrolet Corvette models.

Buy a Used Chevrolet Corvette at Trust Auto

The most challenging thing about used Corvette shopping at Trust Auto is choosing which one to buy. From the Stingray to the ZR1, Corvettes are a specialty for us. And we only offer models that represent the perfect blend of performance and value. It’s the reason that car shoppers from far and wide travel to Trust Auto in Sykesville. 

Buying a used car in Virginia? Buying a used car in Washington, DC? Then the best used vehicles are just a short drive away. Buying a used car in Pennsylvania? Buying a used car in New York? Then learn how our remote shopping services can help you find the perfect vehicle without ever leaving home. 

When your search calls for the best-used car dealership near me, Trust Auto the answer. From Baltimore and beyond, we’re the used car dealer that focuses on you. Call or stop by today to explore our extensive selection of high-quality vehicles.