The RAM 2500/3500 Mega Cab II (DT) series, specifically the 3500 model equipped with the 6.7-liter Cummins turbocharged diesel engine producing 400 horsepower and paired with a six-speed Aisin automatic transmission and a dual rear wheel (DRW) configuration, represents a significant offering in the heavy-duty pickup truck segment. Introduced for the 2019 model year and continuing through 2025, this variant caters to buyers requiring substantial towing and payload capacity. It builds upon the foundation of the DT generation, known for its increased refinement and capability compared to previous iterations.
Technical Specifications
| Brand | RAM |
| Model | 2500/3500 |
| Generation | 2500/3500 Mega Cab II (DT) |
| Type (Engine) | 3500 6.7 Cummins TD (400 Hp) 4×4 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 | 9.7 kg/Hp, 102.8 Hp/tonne |
| Weight-to-torque ratio | 3.6 kg/Nm, 278.6 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 | 3891 kg (8578.19 lbs.) |
| Max. weight | 6350 kg (13999.35 lbs.) |
| Max load | 2459 kg (5421.17 lbs.) |
| Trunk (boot) space – maximum | 1628 l (57.49 cu. ft.) |
| Permitted trailer load with brakes (12%) | 14764 kg (32549.05 lbs.) |
| Length | 6348 mm (249.92 in.) |
| Width including mirrors | 2450 mm (96.46 in.) |
| Height | 2004 mm (78.9 in.) |
| Wheelbase | 4074 mm (160.39 in.) |
| Front track | 1769 mm (69.65 in.) |
| Rear (Back) track | 1927 mm (75.87 in.) |
| Minimum turning circle (turning diameter) | 15.6 m (51.18 ft.) |
| Approach angle | 21.7° |
| Departure angle | 23.1° |
| Ramp-over (brakeover) angle | 21.5° |
| 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 |
INTRODUCTION
The RAM 2500/3500 Mega Cab II (DT) series, launched in 2019, represented a substantial overhaul of the heavy-duty RAM lineup. The 3500 variant, particularly when equipped with the 6.7-liter Cummins diesel and Aisin automatic, was positioned as the ultimate workhorse, designed for demanding tasks like heavy towing and hauling. The “Mega Cab” configuration offered significantly increased rear-seat legroom, making it a popular choice for those needing to transport passengers in comfort alongside substantial cargo or trailers. This specific configuration, with 400 horsepower and the DRW setup, sat at the top of the 3500 range, offering the highest towing and payload capacities available without stepping into the specialized chassis cab models.
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. The 400 horsepower version utilizes a variable geometry turbocharger (VGT) and a high-pressure common rail fuel injection system to deliver both power and efficiency. The engine’s architecture features a cast iron block and head, contributing to its durability. The Aisin AS68RC six-speed automatic transmission is a key component, known for its strength and smooth shifting characteristics. It’s specifically designed to handle the high torque output of the Cummins engine. The transmission features a lock-up torque converter for improved fuel economy at highway speeds and is electronically controlled for precise shift points.
Driving Characteristics
The 400 horsepower/1084 lb-ft torque combination delivers impressive performance, even in a heavy-duty truck. While not designed for outright speed, the RAM 3500 offers ample power for accelerating with a load or maintaining highway speeds. 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 relaxed cruising. Compared to the 3500 models with the 6.4-liter Hemi V8, the Cummins diesel offers significantly more torque, making it the preferred choice for heavy towing. Compared to lower-output Cummins variants, the 400 hp version provides a noticeable increase in power, particularly when climbing hills or accelerating with a heavy load. The dual rear wheels (DRW) configuration enhances stability when towing and increases the truck’s overall payload capacity.
Equipment & Trim Levels
The RAM 3500 6.7L Cummins DRW was available in a variety of trim levels, including Tradesman, Big Horn/Laramie, Limited Longhorn, and Limited. Even the base Tradesman trim included features like air conditioning, a basic infotainment system, and vinyl upholstery. Higher trims added features such as leather upholstery, heated and ventilated seats, a premium sound system, navigation, and advanced safety technologies. Optional extras included a sunroof, upgraded wheels, and various appearance packages. The Mega Cab configuration, standard on many higher trims, provided a spacious and comfortable cabin for passengers.
Chassis & Braking
The RAM 3500 features a heavy-duty chassis designed to withstand the stresses of heavy towing and hauling. The front suspension utilizes an independent multi-link setup for improved ride quality and handling. The rear suspension employs a traditional leaf spring design, optimized for load-carrying capacity. Braking duties are handled by four-wheel disc brakes, with ABS standard. The DRW configuration provides increased braking capacity and stability. The steering system is a recirculating ball system, providing a robust and reliable feel. Stabilizer bars are used at both the front and rear to reduce body roll during cornering.
Market Reception & Comparison
The RAM 3500 with the 6.7-liter Cummins diesel and Aisin automatic received generally positive reviews from automotive critics. It was praised for its powerful engine, smooth transmission, comfortable ride, and impressive towing and payload capabilities. Fuel economy, while not a primary concern for buyers in this segment, was considered reasonable for a heavy-duty truck. Compared to competitors like the Ford Super Duty and Chevrolet Silverado/GMC Sierra 3500, the RAM 3500 was often cited as offering a more refined interior and a more comfortable ride. Reliability has generally been good, although diesel engines can be more expensive to maintain than gasoline engines due to the complexity of the fuel injection system and emissions controls.
Legacy
The 6.7-liter Cummins diesel engine has established a strong reputation for durability and longevity. Properly maintained, these engines can easily exceed 200,000 miles. The Aisin transmission is also known for its reliability. On the used car market, the RAM 3500 6.7L Cummins DRW holds its value well, particularly models in good condition with low mileage. These trucks remain popular among those needing a capable and reliable workhorse for demanding tasks. The DT generation RAM 3500, and this specific powertrain combination, represents a high point in heavy-duty truck engineering, offering a blend of power, capability, and comfort.
