Vehicle Overview

Slotting in price and equipment between the Chevrolet Tahoe and Cadillac Escalade, the GMC Yukon is the middle child among the sport utility vehicles on General Motors' full-size GMT800 platform. As the company redesigns all things GMT800 for 2007 — including the name, which now becomes GMT900 — the Yukon follows suit.

The 2007 Yukon is larger, more powerful and more fuel efficient, with a trio of technologically distinct V-8 engines. These include a 5.3-liter V-8 with a fuel management system that deactivates four cylinders under low-stress situations and a 6.2-liter V-8 that packs 380 horsepower — well beyond the V-8 output in the Ford Expedition, Nissan Armada or Toyota Sequoia. Four-wheel drive is available, as are seating configurations for up to nine occupants.

The new Yukon will be available in spring 2006. Prices begin at $33,815, not including the destination charge.

Exterior

Up front, the Yukon holds a one-piece grille instead of the Tahoe's partitioned unit. Other differentiating details include taller headlights with jewel-like bezels and a wider lower air dam. In profile, the two are largely identical: Both share the same blocky fenders, long rear-quarter windows and squared-off back end.

The Yukon is available in base SLE, SLT and luxury Denali trim levels. Seventeen-inch wheels are standard on all but the Denali edition, which upgrades to 18-inch wheels. The Yukon Denali also gets an Autoride real-time damping suspension, chrome exterior moldings and a power-operated rear liftgate.

Options across the Yukon lineup include 20-inch wheels and a moonroof. Later in the model year, power-extending running boards will also be available.

Interior

The Yukon's dashboard carries the same shape as its redesigned GM siblings. That's good news because the domed instrument panel, low-plane surfaces and flush-mounted buttons are a vast improvement on the rectangular fixtures of previous Yukons, Tahoes and their like. SLE models have cloth seats and tri-zone manual climate control, while the SLT upgrades to leather and automatic climate control. Denali trim levels add heated first- and second-row seats, a Bose premium audio system and an available heated steering wheel.

Three available bench rows in the Yukon SLE allow seating for up to nine occupants. Uplevel models replace first- and second-row benches with captain's chairs, lowering total seating capacity to seven. The second-row seats fold forward, either manually or via an available power mechanism. The third row is removable, but it doesn't fold flat to the floor as some competitors' seats do. With both rows stashed away, maximum cargo volume is 108.9 cubic feet, which places the Yukon in the middle of the pack among the Expedition, Armada and Sequoia.

Under the Hood

On two-wheel-drive Yukons, a standard 4.8-liter V-8 produces 290 hp and 290 pounds-feet of torque. For four-wheel-drive models, the available 5.3-liter V-8 makes 320 hp and 340 pounds-feet; it's optional on two-wheel-drive Yukons.

The 5.3-liter engine features a cylinder-deactivation system that shuts down four cylinders under light-load situations, such as highway driving, for better fuel economy. City mileage remains roughly the same as the 5.3-liter engine in the previous Yukon, but highway mileage increases as much as 22 percent. The engine runs on either gasoline or ethanol-based E85 fuel. Both the 4.8-liter and 5.3-liter engines use a four-speed-automatic transmission.

For maximum grunt, an all-aluminum 6.2-liter V-8 is standard on the Yukon Denali. It produces 380 hp and 415 pounds-feet of torque and runs through a new six-speed-automatic transmission. The Yukon Denali also includes a permanent all-wheel-drive system that's distinct from the available part-time four-wheel drive on the Yukon SLE and SLT.

When properly equipped, the Yukon can tow up to 7,700 pounds. That puts it ahead of the Sequoia but well behind the Expedition and Armada, which can both tow around 9,000 pounds.

Safety

Standard four-wheel disc brakes with ABS are substantially upgraded for 2007, with larger discs and stiffer calipers. A standard electronic stability system includes roll mitigation technology, which can apply individual brakes if sensors detect an impending rollover. Side curtain-type airbags that cover all three rows of seats are standard on the Yukon Denali and optional on other trim levels. Front side-impact airbags are not available.