The Chevrolet Suburban (GMT900) 5.3L V8 with an automatic transmission, produced from 2007 to 2009, represents a significant iteration of Chevrolet’s long-running full-size SUV. This variant occupied a central position within the GMT900 Suburban lineup, offering a balance between capability, space, and affordability. It was part of the fourth generation of the Suburban, known for its body-on-frame construction and substantial interior volume. The GMT900 platform was shared with the Chevrolet Tahoe and GMC Yukon, but the Suburban distinguished itself with its extended wheelbase and increased cargo capacity, catering to families and those requiring significant towing and hauling capabilities.
Technical Specifications
| Brand | Chevrolet |
| Model | Suburban |
| Generation | Suburban (GMT900) |
| Type (Engine) | 5.3L i V8 (324 Hp) Automatic |
| Start of production | 2007 |
| End of production | 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 9 |
| Doors | 5 |
| Fuel consumption (urban) | 15.7 l/100 km (15 US mpg, 18 UK mpg) |
| Fuel consumption (extra urban) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 8.1 kg/Hp, 123.9 Hp/tonne |
| Weight-to-torque ratio | 5.7 kg/Nm, 176.3 Nm/tonne |
| Power | 324 Hp @ 5300 rpm |
| Power per litre | 60.8 Hp/l |
| Torque | 461 Nm @ 4200 rpm (340.02 lb.-ft. @ 4200 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LY5 |
| Engine displacement | 5327 cm3 (325.07 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 | 9.9:1 |
| 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 capacity | 17.3 l (18.28 US qt | 15.22 UK qt) |
| Kerb Weight | 2615 kg (5765.09 lbs.) |
| Max. weight | 3266 kg (7200.3 lbs.) |
| Max load | 651 kg (1435.21 lbs.) |
| Trunk (boot) space – minimum | 1297 l (45.8 cu. ft.) |
| Trunk (boot) space – maximum | 3890 l (137.37 cu. ft.) |
| Fuel tank capacity | 119 l (31.44 US gal | 26.18 UK gal) |
| Length | 5648 mm (222.36 in.) |
| Width | 2010 mm (79.13 in.) |
| Height | 1951 mm (76.81 in.) |
| Wheelbase | 3302 mm (130 in.) |
| Front track | 1732 mm (68.19 in.) |
| Rear track | 1702 mm (67.01 in.) |
| Ride height (ground clearance) | 227 mm (8.94 in.) |
| Drag coefficient (Cd) | 0.45 |
| Minimum turning circle | 13.1 m (42.98 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears | 4 |
| Gearbox type | Automatic transmission |
| Front suspension | Independent, McPherson with coil spring and anti-roll bar |
| Rear suspension | Coil spring |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Tires size | 265/70 R17 |
| Wheel rims size | 17 |
Powertrain & Engine Architecture
The heart of this Suburban variant is the 5.3-liter LY5 V8 engine. This engine is a member of Chevrolet’s Vortec family, known for its robust construction and relatively simple design. The LY5 features a cast iron block and aluminum cylinder heads, contributing to its durability. It utilizes a multi-port fuel injection system, delivering fuel directly to each cylinder for optimized combustion. The engine’s valvetrain employs two valves per cylinder, operated by a single camshaft. The 4L80-E four-speed automatic transmission was the standard pairing for the LY5. This transmission is a heavy-duty unit designed to handle the substantial torque output of the V8 and the significant weight of the Suburban. It features electronic control for smoother shifting and improved fuel efficiency compared to older automatic transmissions.
Driving Characteristics
The 5.3L V8 and 4L80-E automatic combination provided adequate, though not exhilarating, performance for the Suburban. Acceleration from 0 to 60 mph typically took around 7.5-8.5 seconds, depending on load and road conditions. The automatic transmission’s gear ratios were optimized for towing and hauling, prioritizing low-end torque over outright speed. While the transmission offered smooth shifts, it lacked the responsiveness of more modern transmissions with more gears. Compared to the available 6.0L V8, the 5.3L offered less power and torque, resulting in slower acceleration and reduced towing capacity. However, the 5.3L generally provided better fuel economy than the larger engine. The 4L80-E, while reliable, wasn’t as fuel-efficient as newer 6 or 8-speed automatics.
Equipment & Trim Levels
The 5.3L Suburban typically came standard with features like air conditioning, power windows and locks, a CD player, and cloth upholstery. Higher trim levels, such as the LT, added features like leather upholstery, heated seats, a premium sound system, and tri-zone climate control. Optional extras included a navigation system, rear-seat entertainment system, and power-adjustable pedals. The Suburban’s spacious interior was a key selling point, offering seating for up to nine passengers. The third-row seat could be folded flat to maximize cargo space.
Chassis & Braking
The GMT900 Suburban utilized a traditional body-on-frame construction, providing a robust and durable platform. The front suspension featured an independent McPherson strut design with coil springs and an anti-roll bar, while the rear suspension employed a solid axle with coil springs. This setup prioritized ride comfort and load-carrying capacity over sporty handling. All four wheels featured disc brakes, providing adequate stopping power for the vehicle’s weight. An Anti-lock Braking System (ABS) was standard, enhancing safety during emergency braking situations. The rear axle ratio varied depending on the specific configuration, impacting both acceleration and fuel economy.
Market Reception & Comparison
The 5.3L Suburban was generally well-received by critics and consumers alike. It was praised for its spacious interior, comfortable ride, and strong towing capacity. However, some reviewers noted its relatively poor fuel economy and somewhat sluggish acceleration compared to lighter SUVs. Compared to the 6.0L V8 variant, the 5.3L offered a more affordable entry point into the Suburban lineup, appealing to buyers who didn’t require the maximum towing capacity or performance. The 5.3L also proved to be more reliable than the 6.0L in some cases, due to its simpler design and lower stress levels.
Legacy
The LY5 5.3L V8 paired with the 4L80-E transmission has proven to be a remarkably durable powertrain. Many examples remain on the road today with well over 200,000 miles. Common maintenance items include oil changes, transmission fluid flushes, and occasional repairs to the cooling system. The engine is known for its relatively simple design, making it easier and less expensive to repair than more complex engines. In the used car market, the 2007-2009 5.3L Suburban represents a good value for buyers seeking a spacious, capable, and reliable SUV. While fuel economy isn’t a strong point, its overall dependability and affordability continue to make it a popular choice.
