The Ford F-100, part of the sixth generation of the F-Series (1973-1974), represented a significant evolution in Ford’s long-running line of pickup trucks. This generation saw a major restyling, offering increased comfort and features compared to previous iterations. The 3.9 240 Six (115 hp) 4×4 variant occupied a specific niche within the F-100 lineup, serving as a more affordable and fuel-conscious option for buyers needing four-wheel drive capability. While not the most powerful configuration available, it provided a balance of utility and economy for a broad range of tasks, from farm work to light hauling.
Technical Specifications
| Brand | Ford |
| Model | F-Series F-100/F-150 |
| Generation | F-Series F-100 VI Regular Cab |
| Type (Engine) | 3.9 240 Six (115 Hp) 4×4 |
| Start of production | 1973 |
| End of production | 1974 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 3 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Power | 115 Hp |
| Power per litre | 29.2 Hp/l |
| Engine displacement | 3933 cm3 / 240.01 cu. in. |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 101.6 mm / 4 in. |
| Piston Stroke | 81.03 mm / 3.19 in. |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated engine |
| Max. weight | 2540 kg / 5599.74 lbs. |
| Trunk (boot) space – minimum | 1713-1852 l / 60.49 – 65.4 cu. ft. |
| Length | 4803-5215 mm / 189.09 – 205.31 in. |
| Wheelbase | 2972-3378 mm / 117.01 – 132.99 in. |
| Wading depth | 630 mm / 24.8 in. |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels permanently, and the front wheels are driven through an electrically or mechanically operated clutch if necessary. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 4 gears, manual transmission |
| Front suspension | Independent coil spring |
| Rear suspension | Leaf spring |
| Front brakes | Disc |
| Rear brakes | Drum |
| Steering type | Worm-reduction unit |
| Power steering | Electric Steering |
| Tires size | 215/75 R15; 225/75 R15 |
| Wheel rims size | 7J x 15 |
Introduction
The 1973-1974 Ford F-100 represented a significant redesign for the popular pickup truck. The sixth generation F-Series trucks were larger and more comfortable than their predecessors, reflecting a growing demand for trucks that could serve as both work vehicles and personal transportation. The 3.9 240 Six engine, paired with a four-wheel drive system, was positioned as an entry-level option for buyers who needed the capability of 4×4 but didn’t require the higher performance or cost of the V8 engines offered. This configuration was particularly popular in regions where inclement weather or rough terrain were common.
Powertrain & Engine Architecture
The heart of this F-100 variant was the 3.9-liter (240 cubic inch) inline-six cylinder engine. Designated as the 300 cubic inch inline six, it was a robust and relatively simple design known for its durability. The engine utilized a single-barrel carburetor for fuel delivery, a common setup for the time. The valvetrain employed a traditional pushrod configuration. While not a high-revving engine, it produced a respectable 115 horsepower and 180 lb-ft of torque, sufficient for most light-duty tasks. The four-speed manual transmission was the standard offering, providing a direct connection to the engine and allowing for good control in off-road situations. The 4×4 system employed a transfer case allowing the driver to switch between two-wheel drive and four-wheel drive as needed.
Driving Characteristics
The 1973-1974 F-100 with the 3.9L six and manual transmission offered a utilitarian driving experience. Acceleration was modest, and the engine required downshifting for passing maneuvers or climbing steep hills. The manual transmission, while providing good control, demanded more driver involvement than the automatic transmissions available on higher-trim models. The four-wheel drive system added weight and complexity, but it significantly enhanced traction in slippery conditions. The leaf spring rear suspension provided a firm ride, suitable for hauling loads, but could be somewhat bumpy when unloaded. Compared to the V8-powered F-100s, this variant prioritized fuel economy and durability over outright performance.
Equipment & Trim Levels
The F-100 with the 3.9L six and 4×4 was typically offered in a fairly basic trim level. Standard features included a simple vinyl bench seat, a basic instrument cluster, and a heater. Options were available, such as upgraded interior trim, a radio, and power steering. However, this variant was generally geared towards buyers who prioritized functionality over luxury. The exterior typically featured minimal chrome trim and durable paint finishes. The bed was usually equipped with a basic bed liner, and a tailgate chain was standard.
Chassis & Braking
The F-100’s chassis was a traditional body-on-frame construction, providing a robust and durable platform. The front suspension utilized independent coil springs, offering a degree of ride comfort. The rear suspension employed leaf springs, designed to handle heavier loads. Brakes were disc on the front and drum on the rear, a common configuration for trucks of this era. The steering system was a worm-and-sector type, providing adequate steering feel but requiring more effort than modern rack-and-pinion systems. The 4×4 system added significant weight to the front axle, requiring a more robust suspension and braking components.
Market Reception & Comparison
The 3.9L six-cylinder, 4×4 F-100 was viewed as a practical and affordable option for buyers who needed a capable work truck. Critics generally praised its durability and fuel economy, but noted its lack of power compared to the V8 models. Compared to the more popular V8-powered F-100s, this variant appealed to a different segment of the market – those who prioritized cost-effectiveness and reliability over performance. The 300 inline six was known for its longevity, and many examples remain on the road today. Against competitors like the Chevrolet C/K series and the Dodge D-Series, the F-100 offered a competitive combination of features and price.
Legacy
The 1973-1974 Ford F-100 with the 3.9L six and 4×4 has become a popular choice among classic truck enthusiasts. The 300 inline six engine is renowned for its durability and simplicity, making it a relatively easy engine to maintain and repair. Parts availability remains good, and a thriving aftermarket supports these trucks. Today, these F-100s are often seen as reliable and capable workhorses, and they are increasingly valued as collectible vehicles. The combination of a robust engine, a durable chassis, and a simple design has ensured that many of these trucks continue to provide years of service.
