The Pontiac Firebird IV 5.7i V8 Trans Am Automatic, produced from November 1992 through 1999, represented the pinnacle of the fourth-generation Firebird lineup. Positioned as the high-performance variant, it catered to enthusiasts seeking a powerful and stylish American muscle car. This model was a key component of Pontiac’s strategy to maintain a presence in the sporty coupe market, competing directly with the Ford Mustang and Chevrolet Camaro. The Firebird IV, built on the F-body platform shared with the Camaro, offered a blend of aggressive styling, robust V8 power, and a relatively comfortable driving experience. The 5.7i Trans Am Automatic was the top-tier offering, boasting the most potent engine available in the Firebird range.
Technical Specifications
| Brand | Pontiac |
| Model | Firebird |
| Generation | Firebird IV |
| Type | 5.7i V8 Trans Am (275 Hp) Automatic |
| Start of production | November, 1992 |
| End of production | 1999 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Coupe |
| Seats | 4 |
| Doors | 3 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 5.8 kg/Hp, 173.6 Hp/tonne |
| Weight-to-torque ratio | 3.6 kg/Nm, 278.4 Nm/tonne |
| Power | 275 Hp @ 5000 rpm |
| Power per litre | 48 Hp/l |
| Torque | 441 Nm @ 2400 rpm, 325.26 lb.-ft. @ 2400 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LT1 |
| Engine displacement | 5733 cm3, 349.85 cu. in. |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 101.6 mm, 4 in. |
| Piston Stroke | 88.4 mm, 3.48 in. |
| Compression ratio | 10.3:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 4.3 l, 4.54 US qt | 3.78 UK qt |
| Coolant | 14.3 l, 15.11 US qt | 12.58 UK qt |
| Kerb Weight | 1584 kg, 3492.12 lbs |
| Trunk (boot) space – minimum | 365 l, 12.89 cu. ft. |
| Trunk (boot) space – maximum | 954 l, 33.69 cu. ft. |
| Fuel tank capacity | 59 l, 15.59 US gal | 12.98 UK gal |
| Length | 5004 mm, 197.01 in. |
| Width | 1892 mm, 74.49 in. |
| Height | 1321 mm, 52.01 in. |
| Wheelbase | 2566 mm, 101.02 in. |
| Front track | 1542 mm, 60.71 in. |
| Rear (Back) track | 1539 mm, 60.59 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 | 4 gears, automatic transmission |
| Front suspension | Double wishbone |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 235/55 R16 |
| Wheel rims size | 16 |
Powertrain & Engine Architecture
The heart of the 5.7i Trans Am was the General Motors LT1 small-block V8 engine. This 5.7-liter (349.85 cubic inches) engine produced 275 horsepower at 5000 rpm and 325.26 lb-ft of torque at 2400 rpm. The LT1 featured a cast iron block with aluminum cylinder heads, a reverse-flow cooling system, and a multi-port fuel injection system. This design contributed to improved efficiency and power output compared to earlier GM V8s. The engine utilized a 10.3:1 compression ratio and two valves per cylinder. Paired with the LT1 was a 4-speed automatic transmission (4L60E), chosen for its balance of convenience and durability. While not as engaging as a manual transmission, the automatic provided smooth shifts and made the car accessible to a wider range of drivers. The transmission was tuned for street driving, prioritizing comfort over aggressive performance.
Driving Characteristics
The 5.7i Trans Am Automatic delivered a distinctly American driving experience. Acceleration was brisk, with the car capable of reaching 60 mph in around 5.8 seconds. The automatic transmission, while smooth, did result in some power loss compared to the available 6-speed manual. The 4L60E transmission’s gear ratios were optimized for cruising, making it a comfortable highway car. However, it wasn’t as quick to downshift as a manual, impacting responsiveness during aggressive driving. The rear-wheel-drive layout provided a traditional muscle car feel, with a tendency towards oversteer if pushed hard. The suspension, while tuned for comfort, offered reasonable handling, but wasn’t as precise as some European sports cars of the era.
Equipment & Trim Levels
The Trans Am trim level was already well-equipped, but the 5.7i variant added several premium features. Standard equipment included leather bucket seats, air conditioning, power windows and locks, cruise control, and a premium sound system. The Trans Am also featured a distinctive body kit, including a rear spoiler, fender flares, and unique wheels. Optional extras included a T-top roof, upgraded audio systems, and various cosmetic enhancements. Interior upholstery was typically dark gray or black leather, with a sporty dashboard layout featuring analog gauges.
Chassis & Braking
The Firebird IV utilized a unibody construction for improved rigidity. The front suspension consisted of a double wishbone setup, while the rear employed a coil spring arrangement. The 5.7i Trans Am came standard with ventilated disc brakes on all four wheels, providing adequate stopping power. An Anti-lock Braking System (ABS) was also standard, enhancing safety. The steering was a rack-and-pinion system with hydraulic power assist, offering a reasonable level of feedback. The standard tire size was 235/55R16, mounted on 16-inch alloy wheels.
Market Reception & Comparison
The 5.7i Trans Am Automatic was generally well-received by automotive critics. It was praised for its powerful engine, stylish design, and comfortable ride. However, some reviewers noted that the automatic transmission detracted from the overall driving experience. Compared to the base Firebird models with the 3.8-liter V6, the 5.7i offered a significant performance upgrade, but at a higher price point. Against the manual transmission versions of the 5.7i, the automatic was slightly slower but more user-friendly. Fuel economy was typical for a V8-powered muscle car of the era, averaging around 17 mpg city and 24 mpg highway. Reliability was generally good, although the LT1 engine was known to occasionally experience oil leaks.
Legacy
Today, the Pontiac Firebird IV 5.7i V8 Trans Am Automatic is a sought-after collectible. Its combination of power, style, and relative rarity has made it a favorite among enthusiasts. The LT1 engine is considered a robust and reliable powerplant, and parts availability is generally good. Well-maintained examples command a premium in the used car market. The 5.7i Trans Am represents a final chapter in the history of Pontiac’s iconic muscle car, and it continues to be appreciated for its distinctive American character.
