The Dodge Ram 150 Conventional Cab (D/W, facelift 1990) D150 S, powered by the 3.9 V6 engine producing 125 horsepower, represented an entry-level offering in the redesigned Ram pickup truck line. Introduced for the 1990 model year and continuing through 1992, this variant served as a work-focused vehicle, prioritizing affordability and basic functionality over outright performance or luxury. It was a key component of Dodge’s strategy to recapture market share in the increasingly competitive full-size pickup segment. This generation, internally designated D/W, marked a significant departure from the previous generation’s styling and incorporated numerous improvements in comfort and durability.
Technical Specifications
| Brand | Dodge |
| Model | RAM |
| Generation | Ram 150 Conventional Cab (D/W, facelift 1990) |
| Type (Engine) | D150 S 3.9 V6 (125 Hp) |
| Start of production | 1990 |
| End of production | 1992 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 3 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Power | 125 Hp @ 4000 rpm |
| Power per litre | 31.9 Hp/l |
| Torque | 264 Nm / 194.72 lb.-ft. |
| Engine layout | Front, Longitudinal |
| Engine displacement | 3917 cm3 / 239.03 cu. in. |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Fuel injection system | Single-point injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 3.8 l / 4.02 US qt | 3.34 UK qt |
| Coolant | 14.2 l / 15 US qt | 12.49 UK qt |
| Max. weight | 2359 kg / 5200.7 lbs. |
| Fuel tank capacity | 83 l / 21.93 US gal | 18.26 UK gal |
| Length | 4846 mm / 190.79 in. |
| Width | 1754 mm / 69.06 in. |
| Wheelbase | 2921 mm / 115 in. |
| Wading depth | 676 mm / 26.61 in. |
| 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 | 5 gears, manual transmission |
| Front suspension | Hydro-pneumatic element, Independent coil spring |
| Front brakes | Disc, 298.45×31.75 mm |
| Rear brakes | Drum, 279.4×63.5 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | 205/75 R15 |
Powertrain & Engine Architecture
The heart of the D150 S was the 3.9-liter (239 cubic inch) V6 engine, designated the LA318. This engine was a member of the LA engine family, known for its durability and relatively simple design. The LA318 featured a cast iron block and cylinder heads, with a two-barrel carburetor managing fuel delivery via a single-point injection system. While not a high-performance engine, it was considered reliable and offered adequate power for typical light-duty tasks. The engine produced 125 horsepower at 4000 rpm and 264 Nm (194.72 lb-ft) of torque. The engine’s longitudinal mounting and rear-wheel-drive configuration were standard for American pickup trucks of the era. The standard transmission was a 5-speed manual, providing a direct connection to the rear wheels.
Driving Characteristics
The 125-horsepower 3.9L V6, coupled with the 5-speed manual transmission, delivered modest performance. Acceleration was adequate for everyday driving, but hauling heavy loads or towing required careful gear selection and a willingness to work the engine. The gear ratios in the 5-speed manual were geared towards maximizing fuel economy and providing sufficient torque for work-related tasks. Compared to the optional 5.2L V8 or the later 5.9L V6, the 3.9L felt noticeably less powerful, especially when fully loaded. However, the lighter engine weight contributed to slightly improved handling and fuel efficiency. The ride quality, while typical for a body-on-frame pickup truck, was acceptable for daily use, though it lacked the refinement of more modern suspension systems.
Equipment & Trim Levels
The D150 S trim level was the base model for the Ram 150 series. Standard equipment was minimal, focusing on essential features. This included a basic vinyl interior, a simple dashboard layout with analog gauges, and manual windows and locks. Air conditioning and an upgraded stereo system were typically optional extras. The exterior featured minimal brightwork, with black plastic trim and steel wheels being standard. The emphasis was on providing a functional and affordable work truck, rather than a luxurious or feature-rich vehicle. Options included a sliding rear window, a tilt steering wheel, and various towing packages.
Chassis & Braking
The D150 S utilized a traditional body-on-frame construction, providing a robust and durable platform. The front suspension consisted of an independent coil spring setup, while the rear suspension employed leaf springs. This configuration was common for pickup trucks of the time and offered a good balance of load-carrying capacity and ride comfort. The braking system featured disc brakes on the front wheels and drum brakes on the rear. An Anti-lock Braking System (ABS) was available as an option, enhancing safety and control during emergency braking situations. The steering system was a recirculating ball type, providing a direct and responsive feel, though it lacked the precision of more modern rack-and-pinion systems.
Market Reception & Comparison
The Dodge Ram 150 D150 S 3.9L V6 was generally well-received as a value-oriented work truck. Critics acknowledged its affordability and reliability, but noted its lack of power compared to competing models with larger engines. Fuel economy was considered reasonable for a full-size pickup, but not exceptional. Compared to the V8-powered Ram 150 models, the 3.9L V6 offered a lower purchase price and slightly better fuel efficiency, but at the cost of performance. The 3.9L was often chosen by buyers who prioritized cost savings and didn’t require the extra power for heavy-duty tasks. It competed directly with similar base-model pickups from Chevrolet and Ford.
Legacy
The 3.9L V6 engine in the D150 S proved to be a durable and long-lasting powertrain. Many examples remain on the road today, a testament to its robust construction and relatively simple design. While not a collector’s item, well-maintained D150 S models are sought after by those looking for an affordable and reliable classic pickup truck. The LA engine family, of which the 3.9L was a part, continued to be used in Dodge vehicles for many years, further solidifying its reputation for durability. In the used car market, these trucks are often valued for their simplicity and ease of maintenance, making them a popular choice for those seeking a practical and dependable vehicle.
