The Chevrolet Suburban (GMT900) 6.0L V8 with all-wheel drive and an automatic transmission represents a significant iteration of Chevrolet’s long-running full-size SUV. Produced from 2008 through 2012, this variant occupied a prominent position within the fourth generation Suburban (GMT900 series), known for its substantial size, body-on-frame construction, and focus on passenger and cargo capacity. It was a key offering for buyers needing a large, capable vehicle for towing, hauling, and family transportation. This particular configuration, pairing the 6.0-liter V8 with a six-speed automatic, aimed to balance power with relative efficiency within the Suburban lineup.
Technical Specifications
| Brand | Chevrolet |
| Model | Suburban |
| Generation | Suburban (GMT900) |
| Type (Engine) | 6.0L i V8 (352 Hp) AWD Automatic |
| Start of production | 2008 |
| End of production | 2012 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 9 |
| Doors | 5 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 8.3 kg/Hp, 120.4 Hp/tonne |
| Weight-to-torque ratio | 5.6 kg/Nm, 177.2 Nm/tonne |
| Power | 352 Hp @ 5400 rpm |
| Power per litre | 59 Hp/l |
| Torque | 518 Nm @ 4300 rpm, 382.06 lb.-ft. @ 4300 rpm |
| Maximum engine speed | 6000 rpm |
| Engine layout | Front, Longitudinal |
| Engine displacement | 5965 cm3, 364.01 cu. in. |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 101.6 mm, 4 in. |
| Piston Stroke | 92 mm, 3.62 in. |
| Compression ratio | 9.6:1 |
| 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 | 16.9 l, 17.86 US qt | 14.87 UK qt |
| Kerb Weight | 2924 kg, 6446.32 lbs |
| Max. weight | 3901 kg, 8600.23 lbs |
| Max load | 977 kg, 2153.92 lbs |
| Trunk (boot) space – minimum | 1297 l, 45.8 cu. ft. |
| Trunk (boot) space – maximum | 3890 l, 137.37 cu. ft. |
| Fuel tank capacity | 148 l, 39.1 US gal | 32.56 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 (Back) track | 1702 mm, 67.01 in. |
| Ride height (ground clearance) | 235 mm, 9.25 in. |
| Drag coefficient (Cd) | 0.45 |
| Minimum turning circle (turning diameter) | 13.8 m, 45.28 ft. |
| Approach angle | 16.74° |
| Departure angle | 20.93° |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Independent, type McPherson with coil spring and anti-roll bar |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Disc |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 245/75 R16; 265/70 R17 |
| Wheel rims size | 6.5J x 16; 7.5J x 17 |
Powertrain & Engine Architecture
The heart of this Suburban variant is the 6.0-liter (5965 cc) Vortec V8 engine, designated as the LY6. This engine is a member of Chevrolet’s small-block V8 family, known for its durability and relatively simple design. It features a cast iron block with aluminum cylinder heads, two valves per cylinder, and a multi-port fuel injection system. The LY6 engine produces 352 horsepower at 5400 rpm and 382 lb-ft of torque at 4300 rpm. The engine’s relatively high torque output, combined with the six-speed automatic transmission (4L80-E), provided ample power for towing and hauling heavy loads. The 4L80-E transmission is a robust, electronically controlled automatic known for its durability and smooth shifting. It features a torque converter lock-up clutch to improve fuel efficiency at highway speeds.
Driving Characteristics
The 6.0L V8 and 4L80-E automatic combination in the GMT900 Suburban delivered a driving experience focused on capability rather than outright sportiness. Acceleration was adequate for a vehicle of this size and weight, but not particularly brisk. The six-speed transmission helped to keep the engine in its optimal power band, providing reasonable responsiveness for merging and passing. Compared to the available 5.3L V8, the 6.0L offered a noticeable increase in power and torque, making it a better choice for those who frequently towed or carried heavy loads. The automatic transmission, while smooth, lacked the driver engagement of a manual transmission. The Suburban’s substantial weight and high center of gravity resulted in noticeable body roll in corners, and the steering felt somewhat vague. However, the ride quality was generally comfortable, thanks to the independent front and rear suspension.
Equipment & Trim Levels
The 6.0L V8 AWD Suburban typically came in higher trim levels, such as the LT or LTZ. Standard features included tri-zone automatic climate control, power windows and locks, a premium sound system, and leather upholstery. LTZ models added features such as heated front seats, a power liftgate, and a navigation system. Optional extras included a rear-seat entertainment system, sunroof, and upgraded wheels. The interior was designed with practicality in mind, offering ample space for passengers and cargo. The third-row seat could be folded flat to create a large cargo area.
Chassis & Braking
The GMT900 Suburban utilized a 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. The rear suspension employed an independent multi-link setup, also with coil springs. This suspension configuration aimed to balance ride comfort with handling stability. Braking duties were handled by four-wheel disc brakes with ABS. The braking system was adequate for the vehicle’s weight, but required a firm pedal effort. The all-wheel-drive system provided enhanced traction in slippery conditions, making the Suburban a capable vehicle for year-round use.
Market Reception & Comparison
The 6.0L V8 AWD Suburban was generally well-received by critics and consumers alike. It was praised for its spacious interior, powerful engine, and towing capacity. However, its fuel economy was a common criticism, as expected for a vehicle of this size and weight. Compared to the 5.3L V8 Suburban, the 6.0L offered a significant performance advantage, but at a higher price point. The 6.0L was also more expensive to maintain, due to the increased complexity of the engine and its higher fuel consumption. The Suburban competed with other full-size SUVs, such as the Ford Expedition and the Toyota Sequoia.
Legacy
The GMT900 Suburban 6.0L V8 AWD remains a popular choice in the used car market, particularly among those seeking a large, capable SUV for towing and hauling. The LY6 engine is known for its reliability, and the 4L80-E transmission is also considered to be a durable unit. However, potential buyers should be aware of the vehicle’s high fuel consumption and the potential for costly repairs as it ages. Regular maintenance, including oil changes and transmission fluid flushes, is essential to ensure the long-term reliability of this powertrain. Despite its age, the GMT900 Suburban 6.0L V8 AWD continues to offer a compelling combination of space, power, and capability.
