The Ford F-100, part of the sixth generation of the F-Series (1973-1979), represented a significant evolution in Ford’s long-running line of pickup trucks. Produced from 1975 to 1979, the F-100 with the 4.9-liter (300 cubic inch) inline-six engine and a three-speed Cruise-O-Matic automatic transmission occupied a crucial position in the Ford lineup. This configuration was aimed at buyers seeking a dependable, work-oriented truck without the higher cost and complexity of the V8 options. It served as a popular choice for farmers, ranchers, and tradesmen who prioritized practicality and durability over outright performance.
Technical Specifications
| Brand | Ford |
| Model | F-Series F-100/F-150 |
| Generation | F-Series F-100 VI Regular Cab |
| Type (Engine) | 4.9 300 Six (113 Hp) Automatic |
| Start of production | 1975 |
| End of production | 1979 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 3 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Power | 113 Hp |
| Power per litre | 23 Hp/l |
| Engine displacement | 4916 cm3 |
| Engine displacement (cu. in.) | 299.99 cu. in. |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 101.6 mm (4 in.) |
| Piston Stroke | 101.09 mm (3.98 in.) |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated engine |
| Max. weight | 2495 kg (5500.53 lbs.) |
| Trunk (boot) space – minimum | 1393 l (49.19 cu. ft.) |
| Trunk (boot) space – maximum | 2084 l (73.6 cu. ft.) |
| Fuel tank capacity | 73 l (19.28 US gal | 16.06 UK gal) |
| Length | 4808-5215 mm (189.29 – 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 of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 3 gears, automatic transmission Cruise-O-Matic |
| Front suspension | Independent coil spring |
| Rear suspension | Leaf spring |
| Front brakes | Disc |
| Rear brakes | Drum |
| Power steering | Electric Steering |
| Tires size | 215/75 R15; 225/75 R15 |
| Wheel rims size | 7J x 15 |
Powertrain & Engine Architecture
The heart of this F-100 variant was the 4.9-liter (300 cubic inch) inline-six engine. This engine, known for its robust construction and longevity, was a mainstay of Ford trucks for decades. The 300 Six featured a cast-iron block and cylinder head, contributing to its durability. It utilized a single-barrel carburetor for fuel delivery, a common setup for the era, and a relatively simple ignition system. The engine’s valvetrain employed a conventional pushrod design. The three-speed Cruise-O-Matic automatic transmission was a Ford-built unit designed to provide smooth, reliable shifting. It featured a torque converter for increased low-end power and ease of operation. While not a particularly sophisticated transmission by modern standards, the Cruise-O-Matic was well-suited to the engine’s torque characteristics and the truck’s intended use.
Driving Characteristics
The 113 horsepower and approximately 220 lb-ft of torque produced by the 4.9-liter engine and automatic transmission combination resulted in a driving experience focused on utility rather than speed. Acceleration was modest, and the truck was not designed for quick maneuvers. The automatic transmission’s gear ratios were optimized for hauling and towing, prioritizing low-end grunt over high-speed performance. Compared to the available V8 engines, the 300 Six automatic was noticeably slower, especially when fully loaded. However, it offered a smoother, more relaxed driving experience than the manual transmission versions, particularly in city traffic. The automatic transmission did impact fuel economy compared to the manual, but the difference wasn’t substantial for the typical user.
Equipment & Trim Levels
The F-100 with the 300 Six automatic typically fell into the base or mid-range trim levels. Standard equipment generally included a basic vinyl bench seat, a simple dashboard with essential gauges (speedometer, fuel level, temperature), and a basic AM radio. Options included upgraded interior trim, a more powerful radio, air conditioning, and a sliding rear window. The exterior typically featured minimal chrome trim, reflecting its work-oriented nature. Buyers could choose from a range of paint colors, but the emphasis was on practicality rather than luxury. The Custom trim level offered some additional comfort and convenience features, such as upgraded upholstery and additional sound insulation.
Chassis & Braking
The F-100’s chassis was a traditional body-on-frame design, providing a robust and durable platform. The front suspension utilized independent coil springs, offering a reasonable ride quality for a truck. The rear suspension employed leaf springs, which were well-suited for carrying heavy loads. Braking was accomplished via disc brakes on the front wheels and drum brakes on the rear. Power steering was available as an option, making maneuvering the truck easier, especially at low speeds. Tire sizes typically ranged from 215/75R15 to 225/75R15, providing a good balance of traction and ride comfort.
Market Reception & Comparison
The 4.9-liter automatic F-100 was generally well-received by buyers seeking a dependable and affordable work truck. Critics acknowledged its lack of outright performance but praised its durability and fuel efficiency compared to the V8 options. The 300 Six engine was known for its longevity and relatively low maintenance costs. Compared to the 302 and 351 cubic inch V8 engines, the 300 Six automatic offered a lower purchase price and better fuel economy, but at the expense of power and towing capacity. The 300 Six was also considered more reliable than some of the early electronic fuel injection systems offered on the V8s.
Legacy
The Ford F-100 with the 4.9-liter inline-six and Cruise-O-Matic automatic transmission has earned a reputation as a reliable and long-lasting truck. Many examples are still on the road today, a testament to the engine’s durability and the truck’s solid construction. In the used car market, these trucks are often sought after by enthusiasts and those looking for a simple, dependable vehicle. While not a collector’s item in the same vein as some of the higher-performance F-100 variants, the 300 Six automatic remains a popular choice for those who value practicality and affordability. The 300 inline-six engine continued in production for many years, becoming a legendary powerplant in Ford trucks and vans.
