The Chevrolet Impala IX, specifically the 5.3 V8 (303 Hp) Automatic variant, represented a significant offering in the full-size sedan segment during its brief production run from 2009 to 2010. Positioned as a higher-performance trim within the ninth generation Impala (2006-2010), it aimed to provide a blend of spaciousness, comfort, and V8 power. This model year marked the end of the line for the Impala’s rear-wheel-drive platform, making it a notable vehicle for enthusiasts. It was built on the GM W-body platform, a design that had been continuously refined over several decades.
Technical Specifications
| Brand | Chevrolet |
| Model | Impala |
| Generation | Impala IX |
| Type (Engine) | 5.3 V8 (303 Hp) Automatic |
| Start of production | 2009 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5-6 |
| Doors | 4 |
| Fuel consumption (urban) | 14.7 l/100 km (16 US mpg, 19.2 UK mpg) |
| Fuel consumption (extra urban) | 9.8 l/100 km (24 US mpg, 28.8 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 5.6 kg/Hp, 180 Hp/tonne |
| Weight-to-torque ratio | 3.8 kg/Nm, 260.2 Nm/tonne |
| Power | 303 Hp @ 5600 rpm |
| Power per litre | 56.9 Hp/l |
| Torque | 438 Nm @ 4000 rpm (323.05 lb.-ft. @ 4000 rpm) |
| Maximum engine speed | 6100 rpm |
| Engine layout | Front, Transverse |
| Engine Model/Code | LS4 |
| Engine displacement | 5326 cm3 (325.01 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 96 mm (3.78 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 5.7 l (6.02 US qt | 5.02 UK qt) |
| Coolant | 12.6 l (13.31 US qt | 11.09 UK qt) |
| Kerb Weight | 1683 kg (3710.38 lbs.) |
| Trunk (boot) space (minimum) | 526 l (18.58 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Length | 5091 mm (200.43 in.) |
| Width | 1851 mm (72.87 in.) |
| Height | 1487 mm (58.54 in.) |
| Wheelbase | 2807 mm (110.51 in.) |
| Front track | 1585 mm (62.4 in.) |
| Rear track | 1562 mm (61.5 in.) |
| Drag coefficient (Cd) | 0.33 |
| Minimum turning circle | 11.6-12.2 m (38.06 – 40.03 ft.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 4 gears, automatic transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link spring suspension with stabilizer |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 235/50 R18 |
| Wheel rims size | 18 |
Powertrain & Engine Architecture
The heart of the Impala IX 5.3 V8 Automatic is the LS4 engine, a 5.3-liter (325 cubic inch) V8. This engine is a member of General Motors’ small-block V8 family, known for its durability and relatively simple design. The LS4 featured an aluminum cylinder head and block, contributing to weight savings. It utilized a multi-port fuel injection system, delivering fuel directly to each cylinder for optimized combustion. The engine produced 303 horsepower at 5600 rpm and 323 lb-ft of torque at 4000 rpm. The 4L60E four-speed automatic transmission was the sole transmission option for this variant. This transmission, while reliable, was beginning to show its age by the late 2000s, lacking the efficiency and smoothness of newer transmissions with more gears.
Driving Characteristics
The 5.3L V8 provided a noticeable performance boost compared to the base 3.5L V6 Impala. Acceleration was brisk, and the engine offered ample power for highway passing and merging. However, the four-speed automatic transmission limited the engine’s potential, especially at higher speeds. The gear ratios weren’t optimized for fuel efficiency, and the transmission could feel somewhat sluggish during downshifts. The front-wheel-drive configuration, while common for the segment, didn’t offer the same level of handling precision as rear-wheel-drive alternatives. The suspension was tuned for comfort, resulting in a relatively soft ride, but also some body roll during cornering.
Equipment & Trim Levels
The Impala IX 5.3 V8 Automatic typically came well-equipped, reflecting its position as a higher-end trim. Standard features included air conditioning, power windows and locks, a CD player with an auxiliary input, and cruise control. Upholstery was typically cloth, although leather was available as an option. Optional extras included a premium sound system, a sunroof, and remote keyless entry. The interior design was functional and spacious, but the materials used were generally of average quality for the price point.
Chassis & Braking
The Impala IX utilized an independent McPherson strut suspension in the front and an independent multi-link suspension in the rear. This setup provided a comfortable ride, but wasn’t particularly sporty. The front brakes were ventilated discs, while the rear brakes were solid discs. Anti-lock brakes (ABS) were standard. The steering was rack-and-pinion, providing adequate feel and responsiveness. The standard tire size was 235/50R18, mounted on 18-inch alloy wheels.
Market Reception & Comparison
Critics generally praised the Impala IX 5.3 V8 Automatic for its spacious interior, comfortable ride, and strong V8 engine. However, the four-speed automatic transmission and somewhat dated interior design were common criticisms. Compared to the base 3.5L V6 model, the V8 offered significantly more power and a more refined driving experience. Compared to competitors like the Ford Crown Victoria and Dodge Charger, the Impala offered a more modern design and a more comfortable ride, but lacked the rear-wheel-drive performance of the Charger. Fuel economy was a weak point, with the V8 consuming considerably more fuel than the V6.
Legacy
The 2009-2010 Chevrolet Impala IX 5.3 V8 Automatic represents the final iteration of the W-body Impala with a V8 engine. While the 4L60E transmission isn’t known for exceptional longevity when pushed hard, the LS4 engine itself is generally considered reliable. On the used car market, these Impalas are often sought after by enthusiasts who appreciate the combination of V8 power and full-size sedan practicality. Maintenance costs are generally reasonable, although parts availability for some components may become more challenging over time. The Impala IX 5.3 V8 Automatic remains a unique and somewhat underrated vehicle in the American automotive landscape.
