The Ford F-Series F-100 VI Regular Cab, equipped with the 6.6-liter (400 cubic inch) 400 V8 engine producing 169 horsepower and paired with a three-speed Cruise-O-Matic automatic transmission, represents a significant iteration of Ford’s long-running and immensely popular pickup truck line. Produced from 1977 through 1979, this configuration occupied a middle ground within the F-100 lineup, offering a balance between capability and affordability. It was part of the sixth generation of the F-Series (1973-1979), a generation known for its increased size, improved comfort, and a wider range of available options compared to its predecessors.
Technical Specifications
| Brand | Ford |
| Model | F-Series F-100/F-150 |
| Generation | F-Series F-100 VI Regular Cab |
| Type (Engine) | 6.6 400 V8 (169 Hp) Automatic |
| Start of production | 1977 |
| End of production | 1979 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 3 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Power | 169 Hp |
| Power per litre | 25.8 Hp/l |
| Engine displacement | 6555 cm3 / 400.01 cu. in. |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 101.35 mm / 3.99 in. |
| Piston Stroke | 101.35 mm / 3.99 in. |
| Number of valves per cylinder | 2 |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated engine |
| Max. weight | 2449 kg / 5399.12 lbs. |
| Trunk (boot) space – minimum | 1393-2084 l / 49.19 – 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, Transverse stabilizer |
| 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 is Ford’s 400 cubic inch (6.6-liter) V8 engine. This engine, internally designated as the 335-series, was a robust and relatively simple design. It featured a cast iron block and cylinder heads, a two-barrel carburetor, and hydraulic lifters. The 169 horsepower output was a compromise between power and fuel economy, reflecting the changing automotive landscape of the late 1970s. The engine’s longitudinal front-engine layout was standard for the F-Series. The three-speed Cruise-O-Matic automatic transmission was a popular choice for buyers who prioritized ease of use over outright performance. This transmission was known for its durability, but its three-speed configuration meant that the engine often operated at higher RPMs during highway cruising compared to more modern transmissions.
Driving Characteristics
The 169 hp 400 V8 with the Cruise-O-Matic provided adequate, but not exhilarating, performance. Acceleration was reasonable for the time, but the truck wasn’t designed for quick sprints. The automatic transmission’s gear ratios were optimized for towing and hauling, rather than maximizing fuel efficiency or acceleration. Compared to the available manual transmissions, the automatic resulted in a noticeable decrease in fuel economy and a slightly less responsive driving experience. The 400 V8 delivered strong low-end torque, making it well-suited for work tasks, but it lacked the high-end power of the larger 460 cubic inch V8 offered in higher trim levels. The rear-wheel-drive configuration and leaf spring rear suspension provided a firm ride, especially when the truck was unloaded.
Equipment & Trim Levels
The F-100 offered a range of trim levels, and the 400 V8/automatic combination typically fell into the mid-range. Standard equipment included a basic interior with vinyl upholstery, a simple dashboard layout, and manual windows and locks. Optional extras included air conditioning, an upgraded radio, power steering, and a sliding rear window. Higher trim levels, such as the Ranger XLT, offered more luxurious interiors with cloth or leather upholstery, additional chrome trim, and more features as standard. The base models were fairly spartan, focusing on functionality and durability.
Chassis & Braking
The F-100 VI utilized a body-on-frame construction, providing a robust and durable platform. The front suspension consisted of independent coil springs with a transverse stabilizer bar, while the rear suspension employed leaf springs. This setup was designed to handle heavy loads and provide a stable ride. Braking duties were handled by disc brakes at the front and drum brakes at the rear. Power steering was often an optional extra, and its inclusion made maneuvering the large truck considerably easier. Tire sizes typically ranged from 215/75 R15 to 225/75 R15, mounted on 7J x 15 inch steel wheels.
Market Reception & Comparison
The F-100 with the 400 V8 and automatic transmission was a popular choice for buyers who needed a capable and reliable truck for work or personal use. Critics generally praised the truck’s durability and practicality, but noted that the engine’s fuel economy was relatively poor compared to smaller engines. Compared to the six-cylinder engines offered in the F-100, the 400 V8 provided significantly more power and torque, making it a better choice for towing and hauling. However, it also came with a higher price tag and increased operating costs. Against the larger 460 V8, the 400 offered a more manageable fuel consumption, albeit at the cost of ultimate power.
Legacy
The Ford F-Series F-100 VI, particularly the 400 V8/automatic configuration, has become a popular choice among classic truck enthusiasts. The 400 V8 engine is known for its reliability and relatively simple maintenance requirements. Parts availability is generally good, although some components can be difficult to find. These trucks are often sought after for restoration projects or as daily drivers. While not the most powerful or fuel-efficient F-100 variant, the 400 V8/automatic offers a good balance of capability, affordability, and classic Ford truck charm, ensuring its continued presence on roads and in collections for years to come. The Cruise-O-Matic transmission, while not as sophisticated as modern automatics, is generally considered durable and capable of withstanding years of use with proper maintenance.
