The 2006 GMC Sierra 2500HD includes changes and improvements to the engine, transmission and features. The Duramax diesel engine offers reduced emissions and more power. The Allison automatic transmission has six-speeds with tap-shift, range-selection mode. Mirrors are now a folding and extending design, instead of the older camper-style mirrors. They include a convex spotter glass.
Engine and Transmission
The standard engine for the 2006 Sierra 2500HD is a 6-liter V-8. It has 300 horsepower and 360 pound-feet of torque. For drivers looking for a more powerful engine, GMC offers an 8.1-liter V-8 and a 6.6-liter, Duramax turbo-diesel engine. GMC's 8.1-liter engine provides 330 horsepower and 450 pound-feet of torque, and the Duramax diesel engine gives 360 horsepower and 650 pound-feet of torque. The 6-liter engine comes with a five-speed manual transmission and with a four-speed automatic as an option. If you choose the 8.1-liter V-8 or Duramax diesel, it includes a choice of a six-speed manual or a heavy-duty Allison six-speed automatic. The automatic transmissions shift smoothly even with a heavy load, according to the website Edmunds.
Interior Design
The 2006 Sierra 2500HD comes with manual dual-zone air conditioning and a 40/20/40-split bench seat. The SL1 models include a tilt steering wheel, driver message center, tinted glass, cruise control, an AM/FM/CD stereo, and a 40/20/40-split bench seat. SLE1 models also come with remote key-less entry, power-heated exterior mirrors, power windows and door locks, fog lamps and a leather steering wheel. SLE2 models feature an upgraded Bose stereo and a six-way power driver seat. SLTs add driver-seat memory, automatic climate control, power-retractable mirrors, bucket seats with heaters and satellite steering wheel controls.
Towing Features
The 2500HD with the 6-liter engine can tow up to 10,500 lb. while the 8.1-liter V-8 can tow a maximum of 12,000 lb. All models come with a trailering harness and a trailering hitch. Edmunds describes the 2500HD with the Duramax diesel as "probably the best choice for those who tow heavy loads."
Safety Features
All 2006 Sierra 2500HD models come with front-impact airbags, side-impact bars, center high-mounted stop light, daytime running lights, ignition disable and anti-lock brakes (ABS). The SLE1, SLE2 and SLT models also include a security system and a tracker system. The National Highway Traffic Safety Administration conducted front crash tests and the Sierra scored a three-out-of-five rating for driver protection. It earned four stars out of five for the front passenger. The Insurance Institute for Highway Safety also conducted a frontal crash test. Its overall rating was "marginal," which is the second-lowest rating. Also available is the OnStar communications system for 24-hour assistance, whether it's for an emergency tow, directions or a dinner reservation.
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