2007 GMC Sierra models are powered by an efficient lineup of engines, led by the segment's highest-rated V-8 engines. Advanced technology, such as Active Fuel Management (AFM) and variable valve timing (VVT), helps Sierra deliver the segment's best fuel economy. A FlexFuel engine is available - and partnered with fuel-saving AFM - giving customers the choice of powering their truck with E85 ethanol, gasoline or a combination of both fuels. Light-duty engine offerings include:

4.3L V-6 (LU3), rated at 195 hp (145 kW) and 260 lb.-ft. of torque (353 Nm). It is standard on work truck regular cab and 2WD extended cab models.
4.8L V-8 (LY2), with iron block; rated at 295 hp (220 kW) and 305 lb.-ft. of torque (414 Nm)*. It is standard on work truck 4WD extended cab, SLE1 regular cab and extended cab models, and work truck and SLE1 crew cab models.
5.3L FlexFuel V-8 (LMG), E85-capable with iron block and Active Fuel Management, rated at 315 hp (235 kW) and 338 lb.-ft. of torque (458 Nm)*. This engine is available on all models.
5.3L FlexFuel V-8 (LC9), E85-capable with aluminum block and Active Fuel Management, rated at 315 hp (235 kW) and 338 lb.-ft. of torque (458 Nm)*. This engine is available on all models.
5.3L V-8 (LH6), with aluminum block and Active Fuel Management, rated at 315 hp (235 kW) and 338 lb.-ft. of torque (458 Nm)*. It is available on crew cab 4WD models.
5.3L V-8 (LY5), with iron block and Active Fuel Management, rated at 315 hp (235 kW) and 338 lb.-ft. of torque (458 Nm)*. This engine is standard on SLE2 and SLT models; it is available on all other models.
6.0L V-8 (L76), with aluminum block, variable valve timing and Active Fuel Management, rated at 367 hp (274 kW) and 375 lb.-ft. of torque (508 Nm)*. It is available on SLE and SLT extended and crew cab models as part of the enhanced trailering package.
6.2L V-8 (L92), with aluminum block and variable valve timing, rated at 400 hp (298 kW) and 417 lb.-ft. of torque (565 Nm)**. This engine is exclusive to Sierra Denali.

The engines are backed by proven Hydra-Matic electronically controlled automatic transmissions, including the proven 4L60 four-speed automatic, high capacity 4L70 four-speed automatic and a new 6L80 six-speed with the Sierra Denali's 6.2L engine. The six-speed automatic has a wide, 6.04:1 overall ratio - including two overdrive gears - that helps deliver an excellent balance of performance and fuel economy. Also, the 6L80 has a "tap up/tap down" capability that allows the driver to manually select upshifts and downshifts with a button on the column shifter.



Safety and security

Sierra delivers a perimeter of safety protection through a stronger frame and body structure as well as industry- and segment-leading technology. It also is designed to provide increased compatibility with other vehicles. New features include segment-first StabiliTrak electronic stability control with rollover mitigation technology, roof-mounted head curtain side air bags, which are integrated into strengthened chassis and body structures to provide excellent passenger protection, and segment-first safety belt pretensioners that activate during a rear-end crash. The head curtain side air bags are available on Sierra SLE and SLT models.

Driver control dynamics are enhanced by wider front and rear tracks, as well as more responsive suspensions - including a new coil-over-shock front suspension design and rack-and-pinion steering. Additional safety features are offered on 2007 GMC Sierra, including factory-installed remote vehicle starting (segment exclusive), Autotrac active transfer case to help keep the vehicle sure-footed in slippery driving situations, Ultrasonic Rear Parking Assist and a revised, easier-to-use tire pressure monitoring system.

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