The DeSoto Firesweep I Station Wagon, particularly the 1958 facelifted model equipped with the PowerPack 5.7 V8 and TorqueFlite automatic transmission, represents a significant, though ultimately short-lived, chapter in the American automotive landscape. Produced from 1957 to 1958, this variant occupied a middle ground within the Firesweep lineup, offering a blend of family practicality and respectable performance for the era. It was built upon the Chrysler corporation’s forward-looking unibody construction, a relatively new technology at the time, and aimed to compete with station wagons offered by Ford, Chevrolet, and Plymouth. The Firesweep, as a whole, was DeSoto’s attempt to modernize its image and appeal to a broader customer base, but the brand’s eventual demise in 1961 meant the Firesweep’s potential was never fully realized.
Technical Specifications
| Brand | DeSoto |
| Model | Firesweep |
| Generation | Firesweep I Station Wagon (facelift 1958) |
| Type (Engine) | PowerPack 5.7 V8 (295 Hp) TorqueFlite |
| Start of production | 1957 |
| End of production | 1958 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Station wagon (estate) |
| Seats | 6 |
| Doors | 5 |
| Fuel Type | Petrol (Gasoline) |
| Power | 295 Hp @ 4600 rpm |
| Power per litre | 51.4 Hp/l |
| Torque | 522 Nm @ 2800 rpm / 385.01 lb.-ft. @ 2800 rpm |
| Engine displacement | 5735 cm3 / 349.97 cu. in. |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.12 mm / 4.06 in. |
| Piston Stroke | 85.85 mm / 3.38 in. |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Carburettor |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 3.8 l / 4.02 US qt | 3.34 UK qt |
| Coolant | 16.1 l / 17.01 US qt | 14.17 UK qt |
| Fuel tank capacity | 87 l / 22.98 US gal | 19.14 UK gal |
| Length | 5540 mm / 218.11 in. |
| Width | 1989 mm / 78.31 in. |
| Height | 1450 mm / 57.09 in. |
| Wheelbase | 3099 mm / 122.01 in. |
| Front track | 1547 mm / 60.91 in. |
| Rear (Back) track | 1516 mm / 59.69 in. |
| Ride height (ground clearance) | 142 mm / 5.59 in. |
| Minimum turning circle (turning diameter) | 14.2 m / 46.59 ft. |
| 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 TorqueFlite |
| Front suspension | Independent coil spring |
| Rear suspension | Leaf spring |
| Front brakes | Drum, 279 mm |
| Rear brakes | Drum, 279 mm |
| Steering type | Worm-reduction unit |
Powertrain & Engine Architecture
The heart of this Firesweep variant was the DeSoto PowerPack 5.7 V8 engine. This engine, displacing 5735 cubic centimeters (349.97 cubic inches), was a robust and relatively advanced design for its time. It featured a cast iron block and cylinder heads, with a 10:1 compression ratio. The engine utilized a carburetor for fuel delivery and an overhead valve (OHV) valvetrain. The PowerPack designation indicated a higher performance version of the standard DeSoto V8, achieved through a more aggressive camshaft profile and a larger carburetor. This resulted in a power output of 295 horsepower at 4600 rpm and 522 Nm (385.01 lb.-ft.) of torque at 2800 rpm. The engine was mated to a Chrysler TorqueFlite three-speed automatic transmission, a unit known for its smoothness and durability. This transmission was a fully automatic unit, offering a selector lever with Park, Neutral, Drive, and Low ranges.
Driving Characteristics
The combination of the 295 hp V8 and the TorqueFlite automatic transmission provided a comfortable and capable driving experience. While not a sports car, the Firesweep offered brisk acceleration for its size and weight. The TorqueFlite transmission, while smooth, wasn’t particularly quick to shift, and the gear ratios were geared more towards cruising than outright performance. Compared to the manual transmission options available on other Firesweep models, the automatic version sacrificed some responsiveness. However, it provided a more relaxed driving experience, particularly in city traffic. The rear-wheel drive configuration and leaf spring rear suspension contributed to a somewhat firm ride, typical of American cars of the era.
Equipment & Trim Levels
The 1958 Firesweep Station Wagon with the PowerPack V8 and TorqueFlite transmission was positioned as a mid-range offering within the Firesweep lineup. Standard equipment included a spacious interior with seating for six passengers, a full-length vinyl roof, and a generous amount of chrome trim. Interior upholstery was typically cloth and vinyl, with options for upgraded materials. Power steering and power brakes were often included, though not always standard. Optional extras included a radio, heater, air conditioning, and whitewall tires. The dashboard featured a straightforward layout with analog gauges for speed, fuel level, temperature, and oil pressure.
Chassis & Braking
The Firesweep utilized a body-on-frame construction, though it incorporated unibody elements for increased rigidity. The front suspension was independent, utilizing coil springs, while the rear suspension employed leaf springs. This setup provided a reasonable balance between ride comfort and handling. Braking was accomplished via drum brakes on all four wheels, measuring 279 mm in diameter. While adequate for the time, the drum brakes lacked the stopping power of disc brakes, which were becoming increasingly common on more expensive vehicles. Steering was handled by a worm-reduction unit, which provided a relatively heavy but precise feel.
Market Reception & Comparison
The 1958 DeSoto Firesweep, despite its improvements over previous models, faced stiff competition from established rivals like Ford, Chevrolet, and Plymouth. Critics generally praised the Firesweep’s styling and comfortable ride, but some noted its relatively high price compared to competitors. The PowerPack V8 and TorqueFlite combination offered a good balance of performance and convenience, but fuel economy was a concern, typical of large American cars of the era. Compared to the base engine Firesweep models, the PowerPack version offered a significant performance boost, but at a higher cost. Compared to other V8-powered station wagons, the Firesweep offered a competitive level of features and performance.
Legacy
The DeSoto Firesweep, and the DeSoto brand as a whole, ultimately failed to thrive in the face of increasing competition and changing consumer preferences. Production ceased in 1961, and the brand was discontinued. However, the Firesweep remains a collectible classic car, particularly the 1958 facelifted models. The PowerPack 5.7 V8 and TorqueFlite transmission are generally considered reliable and durable, though maintenance can be challenging due to the age of the vehicles. Parts availability can be limited, but a dedicated community of DeSoto enthusiasts continues to support the preservation of these classic cars. Today, a well-maintained 1958 Firesweep Station Wagon represents a unique and stylish piece of American automotive history.
