2015 GMC Sierra 2500HD

2015 GMC Sierra 2500HD and 3500HD models – including Sierra Denali HD – feature bold, new styling and all-new, better-connected interiors. They are also offered with the Duramax 6.6L turbo-diesel engine all Allison 1000 six-speed transmission powertrain combination – a proven combination with more than 1.5 million sold since its introduction in 2000.

Trim levels include a Sierra base model, as well as SLE, SLT and Denali. The distinctive Sierra Denali HD, which accounts for more than one-third of Sierra HD crew cab sales, is offered exclusively as a crew cab, matching do-it-all capability with an exclusive package of design and upscale interior amenities.

The Sierra HDs’ new styling and an all-new, more comfortable and technology-infused interior are carried forward from the 2014 Sierra 1500, including new double cab and revised crew cab body styles. Larger rear doors on each, along with new seat designs, enable easier entry and exit from the rear seat and two inches of additional legroom on crew cabs.

Regular, double cab and crew cab models are offered across the lineup. 2500HD and 3500HD regular cab models are matched an 8’ box, while 2500HD double cab and crew cab models are available with 6’6” or 8’ boxes. Sierra 3500HD double cab is offered exclusively with the 8’ box, while 3500HD crew cabs are available with the 6’6” and 8’ boxes. Dual-rear-wheel configurations are also available on 3500HD.

Gas and Duramax diesel powertrains are offered across the lineup, including an expanded bi-fuel option that allows the gas engine to run on compressed natural gas. The Duramax has been developed to operate for at least 200,000 miles (322,000 km) on a rough-duty cycle without the need for a major overhaul.

The powertrains contribute to the new Sierra HDs’ greater payload and towing ratings than previous models, including the segment’s highest conventional trailering rating – 19,600 pounds. The maximum fifth-wheel/gooseneck trailering rating increases to 23,200 pounds.

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