The RAM 2500/3500 Crew Cab Long II (DT) with the 6.7-liter Cummins Turbo Diesel engine, producing 400 horsepower and paired with an automatic transmission, represents a significant offering in the heavy-duty pickup truck segment. Introduced for the 2019 model year and continuing through 2025, this configuration – specifically the Dual Rear Wheel (DRW) variant – caters to owners requiring substantial towing and payload capacity. It falls within the fifth generation (DT) of the RAM heavy-duty lineup, building upon the foundation laid by previous generations while incorporating updated technology and features. This particular engine and transmission combination positions itself as a workhorse trim, balancing power with usability for demanding tasks.
Technical Specifications
| Brand | RAM |
| Model | 2500/3500 |
| Generation | 2500/3500 Crew Cab Long II (DT) |
| Type (Engine) | 3500 6.7 Cummins TD (400 Hp) Automatic DRW |
| 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 | 9.1 kg/Hp, 109.6 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 296.9 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 | 3651 kg (8049.08 lbs.) |
| Max. weight | 6350 kg (13999.35 lbs.) |
| Max load | 2699 kg (5950.28 lbs.) |
| Trunk (boot) space – maximum | 2115 l (74.69 cu. ft.) |
| Permitted trailer load with brakes (12%) | 15005 kg (33080.36 lbs.) |
| Length | 6626 mm (260.87 in.) |
| Width including mirrors | 2450 mm (96.46 in.) |
| Height | 1959 mm (77.13 in.) |
| Wheelbase | 4294 mm (169.06 in.) |
| Front track | 1769 mm (69.65 in.) |
| Rear (Back) track | 1927 mm (75.87 in.) |
| Ride height (ground clearance) | 260 mm (10.24 in.) |
| Minimum turning circle (turning diameter) | 16.3 m (53.48 ft.) |
| Approach angle | 16.9° |
| Departure angle | 21.2° |
| Ramp-over (brakeover) angle | 17.3° |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| 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) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| 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 |
INTRODUCTION
The RAM 2500/3500 Crew Cab Long II (DT) 3500 6.7 Cummins TD (400 Hp) Automatic DRW, launched in 2019, represents a significant evolution in the heavy-duty truck market. Built on the DT platform, this generation aimed to improve upon ride quality, interior refinement, and technology integration while maintaining the rugged capability expected of a RAM heavy-duty. The 6.7-liter Cummins diesel engine, in its 400 horsepower guise, paired with the Aisin six-speed automatic transmission, is a popular choice for those needing substantial towing and hauling capacity. The DRW (Dual Rear Wheel) configuration further enhances stability and payload capabilities, making it ideal for commercial use or owners with large trailers. This variant sits comfortably in the middle of the RAM 2500/3500 lineup, offering a balance between the base engine options and the more powerful, high-output Cummins variants.
Powertrain & Engine Architecture
At the heart of this truck lies the 6.7-liter Cummins inline-six diesel engine. This engine, designated with various codes depending on specific calibration and emissions equipment, is a robust and well-regarded powerplant. The 400 horsepower version utilizes a variable geometry turbocharger (VGT) and a high-pressure common rail fuel injection system to deliver a broad torque curve. The common rail system allows for precise fuel delivery, optimizing combustion efficiency and reducing emissions. The engine features four valves per cylinder and a cast iron block, contributing to its durability and longevity. The Aisin six-speed automatic transmission is specifically designed to handle the high torque output of the Cummins engine. It features a robust torque converter and heavy-duty components to ensure reliable operation under demanding conditions. The transmission is known for its smooth shifting and ability to hold gears effectively during towing and hauling.
Driving Characteristics
The 400 horsepower Cummins paired with the Aisin automatic delivers a driving experience focused on capability rather than outright speed. While not as quick as lighter-duty trucks or those equipped with the higher-output Cummins engine, this configuration provides ample power for towing heavy loads and navigating challenging terrain. The Aisin transmission’s gear ratios are optimized for towing, providing strong acceleration from a standstill and maintaining comfortable cruising speeds on the highway. The DRW configuration significantly improves stability when towing, reducing sway and providing a more confident feel. Compared to manual transmission versions, the automatic offers ease of use, particularly in stop-and-go traffic or when maneuvering in tight spaces. Compared to the higher-output Cummins, this version offers a slightly more relaxed driving experience, with less aggressive throttle response.
Equipment & Trim Levels
The RAM 2500/3500 Crew Cab Long II (DT) 3500 6.7 Cummins TD (400 Hp) Automatic DRW was available in various trim levels, including Tradesman, Big Horn/Laramie, and Limited. Standard equipment typically included air conditioning, power windows and locks, a basic infotainment system, and a rearview camera. Higher trim levels added features such as leather upholstery, heated and ventilated seats, a premium sound system, navigation, and advanced safety technologies like adaptive cruise control and lane departure warning. Optional extras included a sunroof, upgraded wheels, and various appearance packages. The interior generally featured a spacious cabin with comfortable seating and ample storage space.
Chassis & Braking
The chassis of the RAM 2500/3500 is designed for heavy-duty use. It features a fully boxed frame constructed from high-strength steel. The front suspension utilizes an independent multi-link setup, providing a comfortable ride and improved handling. The rear suspension employs a traditional leaf spring design, optimized for load-carrying capacity. Braking duties are handled by disc brakes on all four wheels, with ABS (Anti-lock Braking System) as standard equipment. The DRW configuration provides increased braking capacity compared to single rear wheel models. Steering is accomplished via a hydraulic rack-and-pinion system, offering precise control and responsive handling.
Market Reception & Comparison
The RAM 2500/3500 with the 6.7-liter Cummins and Aisin automatic received generally positive reviews from critics. It was praised for its comfortable ride, spacious interior, and strong towing capabilities. Fuel economy, while typical for a heavy-duty diesel truck, was a point of discussion, with some reviewers noting that it lagged behind competitors in certain tests. Compared to the higher-output Cummins variants, this 400 horsepower version offered a more affordable price point and a slightly more refined driving experience. Compared to Ford and General Motors’ offerings, the RAM was often lauded for its interior quality and ride comfort.
Legacy
The 6.7-liter Cummins engine, in all its iterations, has a reputation for exceptional durability and longevity. The Aisin transmission is also known for its reliability. Well-maintained examples of the 2019-2025 RAM 2500/3500 with this powertrain configuration are expected to provide many years of service. On the used car market, these trucks hold their value relatively well, particularly those with lower mileage and a clean maintenance history. The combination of power, capability, and comfort makes this a desirable choice for owners who require a heavy-duty pickup truck for work or recreation.
