The Ford Mustang Convertible VI GT 5.0 V8 (426 Hp) Automatic, produced from 2015 to 2017, represents a significant chapter in the storied history of the Ford Mustang. This iteration, part of the sixth-generation Mustang (internally designated S550), marked a pivotal shift towards a truly global vehicle, being sold in over 100 countries. A key advancement for the S550 generation was the adoption of an independent rear suspension across the entire lineup, a substantial improvement over the previous solid axle design, enhancing both ride quality and handling. The GT Convertible specifically offered the classic American muscle car experience with the added enjoyment of open-air driving, powered by the potent 5.0-liter Coyote V8 engine and a smooth-shifting automatic transmission. This variant occupied a premium position within the Mustang lineup, offering a balance of performance, style, and modern features.
Powertrain & Engine Architecture
The heart of the Ford Mustang Convertible VI GT 5.0 V8 Automatic is the “Coyote” 5.0-liter V8 engine. This naturally aspirated engine, identified by engine code 5.0L Ti-VCT, boasts a dual overhead camshaft (DOHC) valvetrain and multi-port fuel injection. It generates 426 horsepower at 6500 rpm and 390 lb-ft of torque at 4250 rpm. The engine features an 11:1 compression ratio and eight cylinders arranged in a traditional V-configuration. The Coyote engine’s design prioritizes both high-revving capability and a broad, usable torque curve. The fuel injection system is a multi-port electronic fuel injection (MPI) system, providing precise fuel delivery for optimal performance and efficiency.
Power is transmitted to the rear wheels via a 6-speed automatic transmission (6R80E). This transmission is known for its smooth and responsive shifts, contributing to both the car’s performance capabilities and its everyday drivability. The 6R80E features a torque converter lock-up clutch, improving fuel efficiency at cruising speeds. The powertrain layout is a classic front-engine, rear-wheel-drive configuration, providing a traditional muscle car driving experience. The transmission’s gear ratios are tuned to balance acceleration and highway cruising, with a final drive ratio typically around 3.55:1.
Engine Specifications
- Displacement: 4,951 cc (302.13 cubic inches)
- Bore x Stroke: 92.2 mm x 92.7 mm (3.63 in x 3.65 in)
- Compression Ratio: 11:1
- Valvetrain: DOHC, 4 valves per cylinder
- Fuel Injection: Multi-port Fuel Injection
Driving Characteristics
The Mustang Convertible VI GT 5.0 V8 Automatic delivers a distinctly American muscle car driving experience. The 426 horsepower and 390 lb-ft of torque provide strong acceleration, with 0-60 mph times typically around 4.6-4.8 seconds. Compared to the manual transmission version, the automatic offers slightly slower acceleration due to inherent transmission losses, but provides greater ease of use, particularly in traffic. Compared to the EcoBoost Mustang, the GT offers a significantly more powerful and engaging driving experience, albeit with reduced fuel economy. The independent rear suspension dramatically improves handling compared to previous Mustang generations, providing better cornering stability and ride comfort. The steering is precise and well-weighted, offering good feedback to the driver. The automatic transmission shifts smoothly and efficiently, although it may not offer the same level of driver control as a manual transmission.
Equipment & Trim Levels
The GT Convertible trim level came standard with a comprehensive list of features. Interior appointments typically included leather-trimmed seats, a leather-wrapped steering wheel, and aluminum pedal covers. Standard technology features included Ford’s SYNC infotainment system with an 8-inch touchscreen display, Bluetooth connectivity, and a premium sound system. Available options included navigation, upgraded sound systems (such as Shaker Audio), heated and cooled front seats, and a power-adjustable steering column. Exterior features included 18-inch alloy wheels, a rear spoiler, and HID headlights. The convertible top was a power-operated soft top, available in a variety of colors. Performance packages, such as the Performance Pack, added features like Brembo brakes, a Torsen limited-slip differential, and unique suspension tuning.
Chassis & Braking
The S550 Mustang benefited greatly from its switch to an independent rear suspension (IRS). This setup utilizes control arms and coil springs, providing improved ride quality, handling, and stability compared to the previous solid rear axle. The front suspension consists of a MacPherson strut design with stabilizer bar. Braking duties are handled by ventilated disc brakes at all four corners. The front brakes typically measure 13.8 inches in diameter, while the rear brakes measure 13.2 inches. Anti-lock Braking System (ABS) and Electronic Stability Control (ESC) are standard features, enhancing safety and control. The steering system is an electric power-assisted rack-and-pinion system, offering precise and responsive steering feel.
Market Reception & Comparison
The Ford Mustang Convertible VI GT 5.0 V8 Automatic was generally well-received by automotive critics. It was praised for its powerful engine, improved handling, and stylish design. Critics noted the significant improvement in ride quality and handling compared to previous Mustang generations, thanks to the independent rear suspension. Fuel economy was considered reasonable for a V8-powered performance car, averaging around 15 mpg city and 24 mpg highway. Compared to the EcoBoost Mustang, the GT offered a more exhilarating driving experience but at the cost of fuel efficiency. Compared to the Chevrolet Camaro Convertible and Dodge Challenger Convertible, the Mustang offered a unique blend of performance, style, and value. The Mustang’s global availability also broadened its appeal, attracting a wider range of customers.
Technical Specifications
| Brand | Ford |
| Model | Mustang Convertible VI |
| Type (Engine) | GT 5.0 V8 (426 Hp) Automatic |
| Production Years | 2015 – 2017 |
| Powertrain Architecture | Internal Combustion Engine |
| Body Type | Cabriolet (Convertible) |
| Seats | 4 |
| Doors | 2 |
| Fuel Consumption (Urban) | 15.7 l/100 km (15 US mpg) |
| Fuel Consumption (Extra Urban) | 9.8 l/100 km (24 US mpg) |
| Fuel Consumption (Combined) | 13.1 l/100 km (18 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Power | 426 Hp @ 6500 rpm |
| Power per liter | 86 Hp/l |
| Torque | 529 Nm (390.17 lb.-ft.) @ 4250 rpm |
| Engine Layout | Front, Longitudinal |
| Engine Model/Code | Coyote |
| Engine Displacement | 4951 cm³ (302.13 cu. in.) |
| Number of Cylinders | 8 |
| Engine Configuration | V-engine |
| Cylinder Bore | 92.2 mm (3.63 in.) |
| Piston Stroke | 92.7 mm (3.65 in.) |
| Compression Ratio | 11:1 |
| Valves per Cylinder | 4 |
| Fuel Injection System | Multi-port manifold injection |
| Engine Aspiration | Naturally aspirated |
| Valvetrain | DOHC |
| Engine Oil Capacity | 7.6 l (8.03 US qt) |
| Coolant Capacity | 12.88 l (13.61 US qt) |
| Fuel Tank Capacity | 60 l (15.85 US gal) |
| Length | 4783 mm (188.31 in.) |
| Width | 1915 mm (75.39 in.) |
| Width with mirrors folded | 2080 mm (81.89 in.) |
| Height | 1394 mm (54.88 in.) |
| Wheelbase | 2720 mm (107.09 in.) |
| Front Track | 1582 mm (62.28 in.) |
| Rear Track | 1648 mm (64.88 in.) |
| Drag Coefficient (Cd) | 0.35 |
| Minimum Turning Circle | 11.52 m (37.8 ft.) |
| Drivetrain Architecture | ICE drives rear wheels |
| Drive Wheel | Rear wheel drive |
| Number of Gears / Gearbox Type | 6 gears, automatic transmission |
| Front Brakes | Ventilated discs |
| Rear Brakes | Ventilated discs |
| Assisting Systems | ABS (Anti-lock braking system) |
| Steering Type | Steering rack and pinion |
| Power Steering | Electric Steering |
| Tire Size | 235/50 R18 |
| Wheel Rim Size | 18 inches |
Legacy
The 2015-2017 Ford Mustang Convertible VI GT 5.0 V8 Automatic holds a significant place in Mustang history. It successfully modernized the iconic pony car while retaining its core appeal. The introduction of the independent rear suspension and its global availability broadened the Mustang’s reach and appeal. On the used car market, these Mustangs are generally well-regarded, though potential buyers should be aware of common issues such as oil consumption (a known issue with the Coyote engine) and potential transmission problems. Regular maintenance, including oil changes and transmission fluid flushes, is crucial for ensuring long-term reliability. Overall, the S550 Mustang GT Convertible remains a popular choice for enthusiasts seeking a powerful, stylish, and engaging driving experience.
