The RAM 2500/3500 Mega Cab I, specifically the 2500 model equipped with the 6.7-liter Cummins turbocharged diesel engine producing 350 horsepower and paired with a six-speed automatic transmission, represents a significant offering in the American heavy-duty pickup truck market. Produced from 2010 to 2012, this configuration occupied a sweet spot in the lineup, balancing substantial towing and hauling capability with a degree of everyday usability. It was part of the second generation of the redesigned Ram Heavy Duty series, known internally as the D/W series, and built upon the foundations of the previous generation while introducing substantial improvements in refinement, capability, and interior space, particularly with the Mega Cab option.
Technical Specifications
| Brand | RAM |
| Model | 2500/3500 |
| Generation | 2500/3500 Mega Cab I |
| Type (Engine) | 2500 6.7 Cummins TD (350 Hp) 4×4 Automatic |
| Start of production | 2010 |
| 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 | 9.3 kg/Hp, 107.6 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 270.9 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) |
| 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.) |
| Number of valves per cylinder | 2 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| 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 | 3252 kg (7169.43 lbs.) |
| Max. weight | 4354 kg (9598.93 lbs.) |
| Max load | 1102 kg (2429.49 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%) | 5579 kg (12299.59 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, automatic 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 |
Introduction
The 2010-2012 RAM 2500/3500 Mega Cab I, powered by the 6.7-liter Cummins diesel and automatic transmission, was a key player in the increasingly competitive heavy-duty truck segment. The Mega Cab configuration, offering significantly more rear-seat legroom than standard crew cabs, was particularly popular with those needing to transport passengers in comfort alongside work-related equipment. This variant aimed to provide a balance between the raw capability of the higher-output Cummins engines and the ease of use offered by the automatic transmission, making it suitable for a wider range of buyers, including those who frequently tow or haul heavy loads but prefer the convenience of an automatic.
Powertrain & Engine Architecture
At the heart of this truck lies the Cummins 6.7-liter inline-six diesel engine, designated ETJ. This engine represented a significant leap forward in diesel technology for RAM, featuring a common-rail fuel injection system capable of extremely high injection pressures for improved combustion efficiency and reduced emissions. The engine utilized a variable geometry turbocharger (VGT) and an intercooler to maximize power and torque output. The 350 horsepower rating was achieved at 3000 rpm, while the impressive 881 lb-ft of torque peaked at a low 1500 rpm, providing exceptional pulling power. The six-speed automatic transmission, sourced from Allison, was specifically designed to handle the high torque output of the Cummins engine. It featured electronically controlled shifting and a tow/haul mode to optimize performance when towing heavy loads.
Driving Characteristics
The 350 hp/881 lb-ft combination delivered a robust driving experience. While not as overtly powerful as the higher-output Cummins variants (which could exceed 400 hp), this configuration provided ample power for most towing and hauling tasks. The automatic transmission, while smooth and convenient, did result in a slight reduction in fuel economy compared to the manual transmission options. The gear ratios were optimized for towing, with lower gears providing strong acceleration when loaded. In real-world conditions, the truck felt confident and capable, even when towing trailers approaching its maximum capacity. The automatic transmission made navigating traffic and maneuvering in tight spaces considerably easier than with a manual gearbox.
Equipment & Trim Levels
The 2500/3500 Mega Cab I with the 6.7L Cummins and automatic transmission was typically offered in several trim levels, including ST, SLT, and Laramie. The base ST trim provided essential features like air conditioning, power windows and locks, and a basic audio system. The SLT trim added features such as alloy wheels, upgraded interior materials, and a more advanced audio system. The Laramie trim represented the premium offering, with leather upholstery, heated and ventilated front seats, a premium audio system, and a host of other luxury features. Optional extras included a navigation system, a rear-seat entertainment system, and various towing packages.
Chassis & Braking
The RAM 2500/3500 featured a robust chassis designed to withstand the stresses of heavy-duty use. The front suspension utilized an independent multi-link design for improved ride quality and handling, while the rear suspension employed a traditional leaf spring setup to provide high load-carrying capacity. Braking duties were handled by disc brakes on all four wheels, coupled with an Anti-lock Braking System (ABS) for enhanced safety. The braking system was appropriately sized to handle the truck’s weight and towing capacity. The rear axle ratios varied depending on the specific configuration and intended use, with lower ratios providing better fuel economy and higher ratios offering improved towing performance.
Market Reception & Comparison
Critics generally praised the 2010-2012 RAM 2500/3500 for its comfortable ride, spacious interior (especially in Mega Cab form), and powerful Cummins diesel engine. The 350 hp/automatic combination was viewed as a good compromise between performance and usability. Compared to the higher-output Cummins variants, this configuration offered slightly better fuel economy and a more refined driving experience. However, some reviewers noted that the automatic transmission could feel slightly sluggish at times, particularly when downshifting. Compared to competitors like the Ford Super Duty and Chevrolet Silverado/GMC Sierra, the RAM 2500/3500 was often lauded for its superior ride quality and interior appointments.
Legacy
The 6.7-liter Cummins diesel engine has proven to be exceptionally durable and reliable, and the 2010-2012 models are generally well-regarded in the used truck market. Properly maintained examples can accumulate hundreds of thousands of miles with minimal issues. The automatic transmission, while not without its critics, has also proven to be relatively reliable. Today, these trucks remain popular choices for those seeking a capable and comfortable heavy-duty pickup, and they often command a premium price compared to older or less well-maintained examples. The combination of Cummins durability, Mega Cab space, and automatic convenience continues to make this variant a desirable option for truck buyers.
