The RAM 2500/3500 Mega Cab I, specifically the 3500 model equipped with the 6.7 HO Cummins turbocharged diesel engine producing 350 horsepower, represents a significant offering in the heavy-duty pickup truck segment. Introduced for the 2012 model year, this configuration was part of the fourth generation of Dodge/RAM heavy-duty trucks (2009-2018), internally designated as the 2500/3500 Mega Cab I. It catered to buyers needing substantial towing and payload capacity, particularly in the American market where heavy-duty trucks are commonly used for both work and personal applications. This variant, often configured as a Dual Rear Wheel (DRW) model, positioned itself as a robust workhorse capable of handling demanding tasks.
Technical Specifications
| Brand | RAM |
| Model | 2500/3500 |
| Generation | 2500/3500 Mega Cab I |
| Type (Engine) | 3500 6.7 HO Cummins TD (350 Hp) 4×4 DRW |
| Start of production | 2012 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5-6 |
| Doors | 4 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 10.3 kg/Hp, 97.5 Hp/tonne |
| Weight-to-torque ratio | 4.1 kg/Nm, 245.5 Nm/tonne |
| Power | 350 Hp @ 3000 rpm |
| Power per litre | 52.3 Hp/l |
| Torque | 881 Nm @ 1500 rpm (649.79 lb.-ft. @ 1500 rpm) |
| Maximum engine speed | 3500 rpm |
| Engine Model/Code | ETJ |
| 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 | 17.3:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | OHV |
| Engine oil capacity | 11.4 l (12.05 US qt | 10.03 UK qt) |
| Coolant | 21.4 l (22.61 US qt | 18.83 UK qt) |
| Kerb Weight | 3588 kg (7910.19 lbs.) |
| Max. weight | 4763 kg (10500.62 lbs.) |
| Max load | 1175 kg (2590.43 lbs.) |
| Trunk (boot) space – maximum | 1628 l (57.49 cu. ft.) |
| Fuel tank capacity | 129 l (34.08 US gal | 28.38 UK gal) |
| Permitted trailer load with brakes (12%) | 66214 kg (145976.88 lbs.) |
| Length | 6309 mm (248.39 in.) |
| Width including mirrors | 2009 mm (79.09 in.) |
| Height | 1989 mm (78.31 in.) |
| Wheelbase | 4064 mm (160 in.) |
| Front track | 1735 mm (68.31 in.) |
| Rear (Back) track | 1732 mm (68.19 in.) |
| Minimum turning circle (turning diameter) | 14.2 m (46.59 ft.) |
| Approach angle | 23.4° |
| Departure angle | 27.6° |
| Ramp-over (brakeover) angle | 18.3° |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, manual transmission |
| 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 | 245/70 R17; 265/70 R17; 275/70 R18 |
| Wheel rims size | 7.5J x 17; 8J x 17; 8J x 18 |
Powertrain & Engine Architecture
The heart of this RAM 3500 is the 6.7-liter Cummins HO (High Output) inline-six diesel engine, designated with the ETJ code. This engine represents a significant evolution of the Cummins B-series diesels that had powered Dodge/RAM trucks for decades. The 6.7L Cummins utilizes a cast iron block and head, known for their durability. It employs a diesel common rail fuel injection system, delivering highly pressurized fuel directly into the cylinders for optimized combustion. The engine is turbocharged and intercooled, enhancing power and efficiency. The valvetrain utilizes an overhead valve (OHV) configuration, a design choice prioritizing robustness and low-end torque. The 6-speed manual transmission was standard, providing drivers with full control over the engine’s powerband.
Driving Characteristics
The 350-horsepower and 881 lb-ft of torque delivered by the 6.7L Cummins in this configuration provided substantial pulling power. While not as quick accelerating as lighter-duty trucks, the RAM 3500 excelled at towing heavy loads. The manual transmission allowed for precise gear selection, maximizing engine braking on descents and providing control when navigating challenging terrain. The gear ratios were optimized for towing, with lower gears providing ample torque multiplication. Compared to the standard output Cummins (305 hp), the HO version offered a noticeable increase in power, particularly at higher RPMs. However, the standard output engine was often favored by those prioritizing fuel economy over outright power.
Equipment & Trim Levels
The 3500 trim level generally offered a higher level of standard equipment compared to the 2500. Standard features typically included air conditioning, power windows and locks, a basic audio system, and vinyl upholstery. The Mega Cab configuration provided significantly more interior space than the standard cab, offering increased comfort for passengers. Optional extras included leather upholstery, a premium audio system, navigation, heated seats, and various towing packages. DRW (Dual Rear Wheel) configurations were common with this engine, further enhancing towing capacity and stability.
Chassis & Braking
The RAM 3500 chassis was built for heavy-duty use. It featured a robust frame and heavy-duty suspension components. The front suspension utilized an independent multi-link design, providing a relatively comfortable ride despite the truck’s weight. The rear suspension employed leaf springs, designed to handle heavy loads. Braking duties were handled by disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) was standard, enhancing safety during emergency braking situations. The DRW configuration featured wider axles and increased stability, particularly when towing.
Market Reception & Comparison
The 2012 RAM 3500 with the 6.7L Cummins HO engine received generally positive reviews. Critics praised its powerful engine, robust construction, and impressive towing capacity. Fuel economy, while not exceptional, was considered reasonable for a 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 comfortable ride and spacious interior, particularly in the Mega Cab configuration. The manual transmission was appreciated by those who preferred greater control, but some drivers found it less convenient than an automatic transmission.
Legacy
The 6.7L Cummins engine has proven to be exceptionally durable and reliable. Properly maintained examples continue to operate reliably with high mileage. The 2012 RAM 3500, particularly those equipped with the 6.7L HO Cummins and manual transmission, hold their value well in the used car market. They remain popular among those needing a capable and dependable heavy-duty truck for work or recreational purposes. The engine’s longevity and readily available parts contribute to its continued desirability. While newer RAM trucks offer more advanced technology and features, the 2012 model represents a sweet spot for those seeking a proven and capable workhorse.
