The RAM 2500/3500 Crew Cab Long II (DT) model, specifically the 3500 variant equipped with the 6.7-liter Cummins turbocharged diesel engine producing 400 horsepower and paired with a six-speed Aisin automatic transmission and a 4×4 drivetrain, represents a significant offering in the heavy-duty pickup truck segment. Introduced for the 2019 model year and continuing through 2025, this configuration aimed to balance substantial towing and hauling capability with a degree of everyday usability. It occupied a sweet spot in the RAM lineup, positioned above the gasoline-powered engines but below the even more powerful, high-output Cummins options, appealing to buyers needing serious capability without the highest price tag.
Technical Specifications
| Brand | RAM |
| Model | 2500/3500 |
| Generation | 2500/3500 Crew Cab Long II (DT) |
| Type (Engine) | 3500 6.7 Cummins TD (400 Hp) 4×4 Automatic SRW |
| Start of production | 2019 |
| End of production | 2025 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5-6 |
| Doors | 4 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 8.9 kg/Hp, 112 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 303.4 Nm/tonne |
| Power | 400 Hp @ 2800 rpm |
| Power per litre | 59.8 Hp/l |
| Torque | 1084 Nm @ 1800 rpm (799.52 lb.-ft. @ 1800 rpm) |
| Maximum engine speed | 3200 rpm |
| Engine layout | Front, Longitudinal |
| Engine displacement | 6690 cm3 (408.25 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 107 mm (4.21 in.) |
| Piston Stroke | 124 mm (4.88 in.) |
| Compression ratio | 16.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Engine oil capacity | 11.4 l (12.05 US qt | 10.03 UK qt) |
| Coolant | 20.8 l (21.98 US qt | 18.3 UK qt) |
| Kerb Weight | 3573 kg (7877.12 lbs.) |
| Max. weight | 5579 kg (12299.59 lbs.) |
| Max load | 2006 kg (4422.47 lbs.) |
| Trunk (boot) space – maximum | 2115 l (74.69 cu. ft.) |
| Permitted trailer load with brakes (12%) | 11407 kg (25148.13 lbs.) |
| Length | 6626 mm (260.87 in.) |
| Width including mirrors | 2120 mm (83.46 in.) |
| Height | 1990 mm (78.35 in.) |
| Wheelbase | 4300 mm (169.29 in.) |
| Front track | 1719 mm (67.68 in.) |
| Rear (Back) track | 1703 mm (67.05 in.) |
| Ride height (ground clearance) | 290 mm (11.42 in.) |
| Minimum turning circle (turning diameter) | 16.4 m (53.81 ft.) |
| Approach angle | 23.3° |
| Departure angle | 23.5° |
| Ramp-over (brakeover) angle | 22.4° |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, automatic transmission Aisin |
| Front suspension | Independent multi-link suspension |
| Rear suspension | Leaf spring |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Tires size | 235/80 R17; 275/70 R18 E; 285/60 R20E |
| Wheel rims size | 6J x 17; 8.0J x 18; 8J x 20 |
Powertrain & Engine Architecture
At the heart of this RAM 3500 is the 6.7-liter Cummins inline-six diesel engine. This engine, designated with various codes depending on the specific year and emissions configuration, is a robust and well-regarded powerplant known for its durability and torque output. The 400 horsepower version utilizes a variable geometry turbocharger (VGT) and a high-pressure common rail fuel injection system to optimize performance and efficiency. The common rail system allows for multiple injection events per combustion cycle, improving fuel atomization and reducing emissions. The engine features a cast iron block and head, contributing to its longevity. The Aisin six-speed automatic transmission, specifically designed for heavy-duty applications, is a key component. It’s known for its smooth shifting and ability to handle the engine’s substantial torque. The transmission features a lock-up torque converter to improve fuel economy at highway speeds.
Driving Characteristics
The 400 hp/1084 lb-ft torque combination delivers impressive performance, particularly in demanding situations like towing and hauling. While not as quick accelerating as lighter-duty trucks, the RAM 3500 provides ample power for merging onto highways and maintaining speed even when heavily loaded. The Aisin transmission is well-matched to the engine, providing smooth and predictable shifts. The gear ratios are optimized for towing, with lower gears providing strong pulling power and higher gears allowing for comfortable cruising. Compared to the higher-output Cummins variants, this 400 hp version offers a more relaxed driving experience, with less aggressive throttle response. Compared to gasoline engine options, the diesel provides significantly more low-end torque, making it ideal for work applications.
Equipment & Trim Levels
The RAM 3500 Crew Cab Long II (DT) with the 6.7L Cummins and automatic transmission was available in various trim levels, including Tradesman, Big Horn/Laramie, and Limited. The Tradesman trim served as the work-oriented base model, featuring vinyl upholstery, basic infotainment, and manual climate control. Higher trims like the Laramie added features such as leather upholstery, heated and ventilated seats, a larger touchscreen display, and premium audio systems. Optional extras included a sunroof, navigation system, and various driver-assistance technologies like adaptive cruise control and lane departure warning. Standard equipment across most trims included a rearview camera, keyless entry, and a robust infotainment system with Apple CarPlay and Android Auto compatibility.
Chassis & Braking
The RAM 3500 features a heavy-duty chassis designed to withstand the stresses of heavy loads. The front suspension utilizes an independent multi-link setup for improved ride comfort and handling, while the rear suspension employs a traditional leaf spring design for durability and load-carrying capacity. Braking duties are handled by disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) is standard. The rear axle ratios varied depending on the specific configuration, influencing both towing capacity and fuel economy. The long wheelbase of the Crew Cab Long II model contributes to a stable and comfortable ride, even when unladen.
Market Reception & Comparison
The RAM 3500 with the 6.7L Cummins and Aisin automatic received generally positive reviews. Critics praised its powerful engine, smooth transmission, and comfortable ride. Fuel economy, while not exceptional, was considered reasonable for a heavy-duty truck of its size and capability. Compared to competitors like the Ford Super Duty and Chevrolet Silverado/GMC Sierra, the RAM 3500 was often lauded for its refined interior and comfortable ride quality. The 400 hp Cummins variant offered a compelling balance between power and price, making it a popular choice for buyers who needed serious towing and hauling capability but didn’t require the ultimate performance of the higher-output Cummins engine.
Legacy
The 6.7L Cummins engine, in all its iterations, has earned a reputation for exceptional reliability and longevity. Properly maintained, these engines can easily exceed 200,000 miles. The Aisin transmission is also known for its durability. On the used car market, RAM 3500s equipped with this powertrain combination hold their value well, reflecting their strong reputation and capability. Common maintenance items include regular oil changes, fuel filter replacements, and coolant flushes. The DT generation RAM 3500 represents a high point in heavy-duty truck design, offering a compelling combination of power, comfort, and capability that continues to appeal to buyers today.
