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Greater efficiency is delivered through reduced "spin loss" by Xp125
Greater efficiency is delivered through reduced "spin loss" - meaning, the transmission channels more of the engine's power to the axles, allowing it to do more with less fuel. The Allison 1000 also features driver shift control with tap up/tap down shifting and a patented elevated idle mode cab warm-up feature. Also, the tow/haul mode reduces shift cycling for better control and improved cooling when towing or hauling heavy loads. The six-speed configuration retains its two overdrive gears for optimal efficiency. Performance with the Duramax/Allison combination is also improved over previous models, with preliminary testing showing 0-60 mph times of less than 9 seconds and quarter-mile times of less than 16 seconds in 2500HD models. That's about 0.3-second and 0.5-second quicker, respectively, than previous models.
A strengthened Vortec 6.0L/Hydra-Matic 6L90 six-speed powertrain is standard in all models.
The details: The Vortec 6.0L gas V-8 with variable valve timing returns to the new Sierra HDs, along with a strengthened version of the Hydra-Matic 6L90 six-speed automatic transmission. This combination delivers excellent performance and efficiency, with a greater emphasis on low-rpm power. It is enhanced for 2011 with greater idle refinement.
The engine is rated at 360 horsepower (268 kW) at 5,400 rpm and 380 lb.-ft. (515 Nm) at 4,200 rpm in trucks with GVWRs up to 10,000 pounds. It is rated at an estimated 322 horsepower (240 kW) at 4,400 rpm and 380 lb.-ft. of torque (515 Nm) at 4,200 rpm in trucks with GVWRs greater than 10,000 pounds.
The 6L90 is enhanced for greater strength, smoothness and quietness via:
Adding four attachment bosses to the transfer case adapter (4WD models) for increased strength and smoother, quieter performance
Increasing the cross section size of the transfer case adapter for greater strength
Adding a new, stronger output shaft
Adding a new heat shield and vent hose.
COMPETITIVE FACTS: Ford's new Super Duty models share the same transmission between their gas and diesel engines. Sierra HDs' Allison 1000 and Hydra-Matic 6L90 transmission were developed for the specific horsepower, torque and operating range differences that distinguish the diesel and gas engines.
Brake feel and performance is greatly improved.
The details: The standard four-wheel disc system is completely revamped to deliver smoother, more immediate and confident-feeling performance. Four-wheel, four-channel ABS is standard on all single-rear-wheel models and a three-channel system is standard on dual-rear-wheel models. The front and rear rotors are larger in diameter - 14 inches (355 mm) - and width on all models to support their increased capacity, weight ratings and trailering ratings, while the calipers are stiffer and stronger. The hydroboost brake booster calibration is revised for reduced pedal effort, and the travel of the pedal is also revised for a more comfortable, confident feel. Larger wheel hub and bearing assemblies complement the new brake system, and the rear rotors attach to the wheel hubs for easier servicing.
Sierra HD's 'smart' exhaust brake feature provides greater control and reduces brake pad wear.
The details: A new standard feature on Duramax-equipped models is the "smart" exhaust brake. This driver-selectable feature uses the turbine control of the variable geometry turbocharger and the compression of the engine to generate backpressure, slowing the vehicle without applying the brakes. It is integrated with the cruise control feature and varies the braking to account for the grade and vehicle load. The exhaust brake allows for virtually effortless driving and towing, with seamless and quiet operation. It also helps prolong brake life and prevents overheating the brakes on long, downhill grades.
Comprehensive safety features and functional technologies include trailer sway control system and hill start assist.
The details: The 2011 Sierra 2500HD and 3500HD models have a comprehensive roster of safety features and functional technologies that include:
StabiliTrak electronic stability control system on all single-rear-wheel models
Larger, four-wheel disc brakes with standard four-wheel ABS
A new high-strength steel tubular frame cross member that enhances safety and improves crashworthiness
Seat pelvic/thorax and head curtain side air bags available on 2500HD
Available rear backup camera
Segment-exclusive OnStar 9.0
Trailer sway control system on all single-rear-wheel models
Hill start assist (standard on single-rear-wheel models)
The trailer sway control system provides an added measure of confidence when towing a trailer. The system senses conditions of trailer sway and intervenes with braking and/or reduced engine power to bring the trailer under control and keep it on its intended path. The system uses electric trailer brakes when a trailer is plugged into the standard wiring harness of the truck and its performance requires no input from the driver. The hill start assist system is automatically engaged when sensors detect the vehicle is on a grade of about 5 percent or greater. It holds the brakes for about 1.5 seconds or until the gas pedal is pressed, preventing rollback - it is particularly effective when towing, giving the driver time to switch from the brake pedal to the gas pedal without rolling.
The GMC Sierra HD lineup is broader than ever.
The details: For 2011, the Sierra heavy-duty lineup expands to include 11 2500HD models and eight single- and dual-rear-wheel 3500HD models - including a new 3500HD Crew Cab with a 6.5-foot cargo box. Other models are offered in WT, SLE and SLT trim levels, while popular features such as the EZ Lift tailgate and rearview camera system are retained.
Sierra HD professional-grade interiors are refined and well-appointed - and ready to work.
The details: From the available remote starting feature to the unimpeded access offered by the 170-degree-opening rear access doors on extended cab models, the 2011 Sierra HD models reflect the professional grade blend of refinement and functionality for which GMC is known. The interiors have excellent attention to detail and are quieter - thanks to the range of the truck's enhancements.
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