The GMC Sierra is an excellent choice among full-size pickups, offering serious towing and hauling capability and a choice of cabs ranging from pure pickup to luxury liner. The Sierra is built on the same platform and shares mechanicals with the Chevy Silverado, but their exterior styling is quite different. Sierra offers a choice of 4.8-liter, 5.3-liter, and 6.2-liter V8 engines, plus a hybrid gas-electric.
For 2010, variable valve timing has been added to the 4.8-liter and 5.3-liter engines. All the V8 engines have Flex Fuel capability (meaning they will run on E85). A 3.08:1 axle ratio and fuel saver mode is standard with the 5.3-liter V8 for improved fuel economy, and a six-speed automatic transmission comes on Regular and Extended Cab models with the 5.3-liter V8. The 6.2-liter V8 is available for Sierra Extended Cab and Crew Cab models, and is useful for towing heavier loads.
The Sierra Hybrid uses GM's Two-Mode Hybrid system. It's available only as a Crew Cab model with a specially tuned 332-horsepower 6.0-liter V8 working in conjunction with a battery pack and a four-speed automatic transmission that houses two electric motors. The Hybrid is EPA-rated at 21 mpg City/22 mpg Highway, while compromising payload and towing capacity (maximum around 6000 pounds).
A choice of interior styles is available. The traditional layout, called pure pickup, has a driver-oriented dash layout with large switchgear and door handles designed for work gloves. The pure pickup interior includes a 40/20/40 split front bench seat with the center section folding down to provide a large storage compartment and wide armrest.
The luxurious Sierra SLT has a cabin similar to that of a luxury SUV, with two front bucket seats separated by a fixed center console. This design places audio and ventilation system controls more easily within reach of the front-seat passenger, who may or may not be a spouse, and it offers space for a navigation system and storage compartments.
The Sierra Denali makes for a comfortable, luxurious pickup with the emphasis on performance rather than payload and towing capacity. The Sierra Denali offers the same sort of high-line content as the upscale GMC Yukon Denali sport utility, and it's available with all-wheel drive. Denali comes with a 6.2-liter V8.
For 2010, side-curtain airbags and seat-mounted side airbags are standard. USB connectivity is provided in the center console of all 2010 Sierra models, and availability of the rearview camera has been increased. StabiliTrak electronic stability control with rollover mitigation is standard on all 2010 Sierra 1500 models.