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New GMC Sierra. In our refusal to leave well enough alone and our unwillingness to compromise, we uncovered great capability. Our engineers applied a combination of mechanical, dynamic, and mass-reducing enhancements to give our new GMC Sierra 1500 XFE better conventional engine V8 fuel economy than any other competitor. They equipped another with America's first two-mode Hybrid technology to give the new GMC Sierra Hybrid a 40-per cent improvement in city fuel economy over the conventional engine and best-in class V-8 fuel economy. The new GMC Sierra 3500 HD, equipped with the available Duramax Diesel and Allison transmission, is still the most powerful V-8 one-ton. That's technology that happens when you engineer to exceed expectations. |
Now standard on all new GMC Sierra 1500 models with Vortec 6.2L and 5.3L V8 engines is an electronically controlled 6-speed automatic that combines high max tailering with precise control. Driver Shift Control (DSC) lets you select a range of gears to suit variable driving conditions. Shift into "M" and the currently engaged gear number is illuminated, and all other gears are accessible. As conditions vary, you may change the range of available gears by simply tap-shifting the plus/minus button up or down. The 6-speed's Tow/Haul mode reduces excessive shifting when towing or hauling a heavy load, and it automatically engages grade braking. Grade braking assists in maintaining desired speeds on downhill grades by implementing a shift schedule that utilizes the engine and transmission to slow the vehicle. Available heavy-duty cooling helps deliver improved trailer ratings on all new GMC Sierra models equipped with the 5.3L V9 engines and the 6-speed transmission. Standard with the 4.3L and 4.8L V8 is an electronically controlled 4 speed automatic that features overdrive for highway driving and automatic Tow/Haul mode.. | 
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