The GMC Truck Division of General Motors produces powerful pickups in three sizes for 2006 plus sport-utility vehicles in two formats with stretched and deluxe treatments. All line up behind full-size Sierra, a light-duty (half-ton) pickup enthused this year with powertrain upgrades and new models like the fuel-shaving Sierra Hybrid truck. Wagons include full-size Yukon or mid-size Envoy, each in regular-length and stretched versions. And the Denali designation marks deluxe editions of Sierra, Yukon and Envoy.

GMC's Canyon pickup measures up as a mid-size model with body styling showing design cues from Sierra. Cabs conform as a two-door Regular Cab, Extended Cab with two rear-hinged doors set behind the two front doors, and Crew Cab with four front-hinged doors. In-line design engines motivate Canyon. The entry plant is a Vortec 2.8-liter four-cylinder unit rated for 175 hp, but a Vortec 3.5-liter in-line five-cylinder that climbs to 220 hp is an available option.

Either ties to a five-speed manual transmission or four-speed Hydra-Matic automatic. More across-the-board choices come with formats of rear two-wheel-drive (2WD) or four-wheel-drive (4WD) traction through an automatic active transfer case called Insta-Trac. A new SLT package with heated seats works on Extended Cab and Crew Cab models this year, and the ZQ8 sport suspension package -- with two-inch lower ride height and 17-inch aluminum wheels -- is a new option.

Sierra trucks in half-ton 1500 series include Wideside and Sportside body styles, rear 2WD and 4WD modes, and cabs of regular and extended lengths. In addition, Sierra offers the deluxe and powerful Sierra Denali rigged with an all-wheel-drive (AWD) system. For '06 the series adds an Extended Cab with short cargo box and a new SL Crew Cab base model. Vortec engines range from a 4.3-liter V6 at 195 hp and the 4.8-liter V8 with 285 hp to a 5.3-liter V8 pumping 295 hp or 310 hp, plus a 6.0-liter V8 worth 300 hp or 345 hp for Denali. A hybrid electric version called Sierra Hybrid saves about 12 percent on fuel, using the 5.3-liter V8 with an electric motor plus optional 4WD traction. And a new VortecMAX Performance Package for Sierra boosts tow capability with the high-output Vortec V8 added with 345 hp.

The HD (heavy-duty) label for Sierra signifies work trucks stretched to king-size dimensions. And they develop top-of-class gross vehicle weight ratings (GVWR). The series provides cabs of regular and extended lengths in 2500 (three-quarter-ton) and 3500 (one-ton) models. Muscular engines power these big rigs to the top of the heavy-duty class -- from a Vortec 6.0-liter V8 worth 300 hp or big-block 8.1-liter Vortec at 330 hp to a Duramax 6.6-liter turbo-diesel for 310 hp. A new Duramax turbo-diesel, coming later in 2006 and linked to a new Allison 1000 six-speed automatic transmission, will deliver 360 hp with torque rising to 650 lb-ft. Sierra Performance Edition for 2WD Extended Cab truck nets the high-output 6.0-liter V8 at 345 hp. And for Sierra 3500 Crew Cab long-box with single rear wheels, new chrome-clad steel wheels go to the option list. (CONTINUED...)