2019-2025 RAM 25003500 Crew Cab Long II (DT) 3500 6.7 Cummins TD (400 Hp) Automatic SRW

The RAM 2500/3500 Crew Cab Long II (DT) with the 6.7-liter Cummins turbocharged 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 aimed to balance substantial towing and hauling capability with a degree of everyday usability. Positioned as a mid-to-high range trim within the 2500/3500 lineup, it catered to buyers needing serious truck performance without necessarily opting for the highest-spec, most expensive models. This variant, designated as Single Rear Wheel (SRW), was a popular choice for both commercial and private users.

Technical Specifications

Powertrain & Engine Architecture

At the heart of this RAM variant lies the 6.7-liter Cummins inline-six diesel engine. This engine, designated with various codes throughout its production run, 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 6.7L Cummins with the Aisin automatic delivers a driving experience focused on capability rather than outright speed. While 400 horsepower is substantial, the engine’s strength lies in its massive 1084 lb-ft of torque. This translates to effortless towing and hauling, even with heavy loads. The automatic transmission is well-matched to the engine, providing smooth and predictable shifts. Compared to the manual transmission options, the automatic offers greater convenience, particularly in stop-and-go traffic. However, some drivers may find the automatic slightly less responsive than a manual, especially when downshifting for engine braking. The gear ratios are optimized for towing, with a relatively low first gear for launching heavy loads and a tall overdrive gear for efficient highway cruising. The SRW configuration provides a stable platform, but the ride quality can be firm, especially when unladen, due to the heavy-duty suspension.

Equipment & Trim Levels

The 2500/3500 Crew Cab Long II (DT) 400hp Cummins Automatic SRW was typically offered in several trim levels, including Tradesman, Big Horn/Laramie, and Limited. The Tradesman trim served as the base model, offering essential features like air conditioning, a basic infotainment system, and vinyl upholstery. Big Horn/Laramie trims added features such as cloth or leather upholstery, upgraded infotainment systems with larger touchscreens, and more exterior chrome trim. The Limited trim represented the highest level of luxury, with premium leather, wood trim, and advanced safety features. Standard equipment across most trims included power windows and locks, keyless entry, and a rearview camera. Optional extras included a sunroof, navigation system, premium sound system, and various driver-assistance technologies.

Chassis & Braking

The RAM 2500/3500 utilizes a robust chassis designed to withstand heavy loads. The front suspension features an independent multi-link setup for improved ride comfort and 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, providing ample stopping power. An Anti-lock Braking System (ABS) is standard. The 3500 models, in particular, often featured heavier-duty components, including thicker stabilizer bars and upgraded brakes, to accommodate their higher GVWR (Gross Vehicle Weight Rating). Steering is rack-and-pinion with hydraulic power assist, providing a responsive and predictable feel.

Market Reception & Comparison

The RAM 2500/3500 with the 6.7L Cummins and automatic transmission was generally well-received by critics and consumers alike. It was praised for its powerful engine, smooth transmission, and impressive towing and hauling capabilities. Fuel economy, while not a primary concern for heavy-duty truck buyers, was considered competitive within the segment. Compared to the gasoline-powered RAM 2500/3500 models, the Cummins diesel offered significantly more torque and better fuel economy when towing. Compared to the higher-output Cummins variants (e.g., those producing over 400 horsepower), this version offered a balance of performance and cost. Some critics noted that the ride quality could be firm, especially when unladen, and that the interior, while functional, wasn’t as luxurious as some competitors.

Legacy

The 6.7L Cummins engine has established a strong reputation for reliability and longevity. Properly maintained, these engines can easily exceed 200,000 miles. The Aisin automatic transmission is also known for its durability. On the used car market, these RAM 2500/3500 models hold their value relatively well, particularly those in good condition with well-documented maintenance histories. The combination of power, capability, and reliability makes this variant a popular choice for buyers seeking a heavy-duty truck that can handle demanding tasks for years to come. Common maintenance items include regular oil changes, fuel filter replacements, and coolant flushes. The availability of aftermarket parts and support is excellent, ensuring that these trucks can be kept running for many years.