The GMC Yukon III, produced between 2007 and 2009, represented the third generation of GMC’s full-size SUV. Built on the GMT900 platform shared with Chevrolet and Cadillac counterparts, the Yukon aimed to provide a blend of spaciousness, capability, and comfort for American families. This particular variant, equipped with the 5.3-liter V8 engine paired with a four-speed automatic transmission and four-wheel drive, occupied a central position in the Yukon lineup, offering a balance between performance and affordability. It served as a popular choice for those needing substantial towing capacity and passenger space without opting for the higher trims and associated costs.
Technical Specifications
| Brand | GMC |
| Model | Yukon |
| Generation | Yukon III (GMT900) |
| Type (Engine) | 5.3 i V8 16V (320 Hp) FlexFuel 4WD Automatic |
| Start of production | 2007 |
| End of production | 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 9 |
| Doors | 5 |
| Fuel consumption (economy) – urban | 16.8 l/100 km (14 US mpg, 16.8 UK mpg) |
| Fuel consumption (economy) – urban (Ethanol – E85) | 23.5 l/100 km |
| Fuel consumption (economy) – extra urban | 11.8 l/100 km (19.9 US mpg, 23.9 UK mpg) |
| Fuel consumption (economy) – extra urban (Ethanol – E85) | 15.7 l/100 km |
| Fuel Type | Petrol / Ethanol – E85 |
| Weight-to-power ratio | 8 kg/Hp, 124.3 Hp/tonne |
| Weight-to-torque ratio | 5.6 kg/Nm, 179 Nm/tonne |
| Power | 320 Hp @ 5200 rpm |
| Power per litre | 60.1 Hp/l |
| Torque | 461 Nm @ 4200 rpm (340.02 lb.-ft. @ 4200 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LMG |
| Engine displacement | 5328 cm3 (325.13 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 | 17.3 l (18.28 US qt | 15.22 UK qt) |
| Kerb Weight | 2575 kg (5676.9 lbs.) |
| Max. weight | 3311 kg (7299.51 lbs.) |
| Max load | 736 kg (1622.6 lbs.) |
| Trunk (boot) space – minimum | 479 l (16.92 cu. ft.) |
| Trunk (boot) space – maximum | 3084 l (108.91 cu. ft.) |
| Fuel tank capacity | 98 l (25.89 US gal | 21.56 UK gal) |
| Permitted trailer load with brakes (12%) | 3719 kg (8198.99 lbs.) |
| Length | 5130 mm (201.97 in.) |
| Width | 2007 mm (79.02 in.) |
| Height | 1956 mm (77.01 in.) |
| Wheelbase | 2946 mm (115.98 in.) |
| Front track | 1732 mm (68.19 in.) |
| Rear (Back) track | 1702 mm (67.01 in.) |
| Minimum turning circle (turning diameter) | 11.9 m (39.04 ft.) |
| Drive wheel | All wheel drive (4×4) |
| 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 suspension, Coil spring |
| Front brakes | Disc, 330×30 mm |
| Rear brakes | Disc, 345×20 mm |
| Assisting systems | ABS (Anti-lock braking system), Power steering Electric Steering |
| Tires size | 265/70 R17 |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
At the heart of this Yukon variant lies the GM 5.3L LMG V8 engine. This engine, a member of the Vortec family, is a naturally aspirated, 90-degree V8 featuring a cast iron block and aluminum cylinder heads. It utilizes a multi-port fuel injection system, delivering fuel directly to each cylinder. The engine produces 320 horsepower at 5200 rpm and 461 lb-ft of torque at 4200 rpm. The FlexFuel capability allowed the engine to run on gasoline or a blend of up to 85% ethanol (E85), offering some flexibility at the pump. The engine’s 16 valves (two per cylinder) are actuated by a single overhead camshaft. The four-speed 4L60E automatic transmission was the standard pairing for this engine. This transmission, known for its durability, features electronic control for smoother shifting and optimized performance. While not the most modern transmission by today’s standards, it was well-suited to the engine’s torque characteristics and the Yukon’s intended use.
Driving Characteristics
The 5.3L V8 and 4L60E automatic combination provided adequate, though not exhilarating, performance. Acceleration from 0 to 60 mph typically took around 7.5-8.5 seconds, depending on load and conditions. The automatic transmission’s gear ratios were geared towards towing and hauling, prioritizing low-end torque over outright speed. Compared to the available 6.2L V8, this variant felt noticeably less powerful, especially when fully loaded or towing a trailer. However, it offered a smoother and more relaxed driving experience than the smaller 4.8L V8. The four-speed transmission, while reliable, lacked the efficiency and responsiveness of newer transmissions with more gears. Fuel economy was typical for a full-size SUV of the era, averaging around 14-16 mpg in city driving and 18-20 mpg on the highway.
Equipment & Trim Levels
The 5.3L Yukon typically came standard with features like air conditioning, power windows and locks, a CD player, and cloth upholstery. The SLE trim, which often included this engine/transmission combination, added features such as alloy wheels, upgraded interior trim, and a remote keyless entry system. Optional extras included leather upholstery, a premium sound system, a navigation system, and a rear entertainment system. The Yukon’s spacious interior could comfortably seat up to nine passengers, making it a popular choice for large families. The third-row seat could be folded flat to create a large cargo area.
Chassis & Braking
The GMT900 platform utilized a body-on-frame construction, providing a robust and durable chassis. The front suspension featured an independent McPherson strut design with coil springs and a stabilizer bar, while the rear suspension employed an independent multi-link setup with coil springs. This suspension configuration aimed to balance ride comfort with handling stability. Braking duties were handled by disc brakes on all four wheels, providing adequate stopping power for a vehicle of this size and weight. Anti-lock brakes (ABS) were standard equipment. The Yukon’s four-wheel drive system offered enhanced traction in inclement weather and off-road conditions.
Market Reception & Comparison
The 5.3L Yukon 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 low fuel economy and the lack of modern features compared to some competitors. Compared to the 4.8L Yukon, the 5.3L offered a significant performance boost, making it a more appealing option for those who frequently towed or hauled heavy loads. Compared to the 6.2L Yukon, it represented a more affordable option, albeit with less power. The 5.3L Yukon competed primarily with the Ford Expedition, Chevrolet Tahoe, and Nissan Armada.
Legacy
The GMT900 Yukon, particularly the 5.3L variant, has proven to be a relatively reliable vehicle. The LMG engine is known for its durability, and the 4L60E transmission, while not without its potential issues, is generally considered robust when properly maintained. Today, these Yukons can be found in the used car market at relatively affordable prices. Common maintenance items include oil changes, transmission fluid flushes, and regular inspections of the suspension and braking systems. While not as fuel-efficient or technologically advanced as modern SUVs, the 5.3L Yukon remains a capable and comfortable vehicle for those seeking a spacious and versatile full-size SUV.
