The Specifications of a 2007 GMC Sierra 2500HD Duramax

by James Rutter
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In 2007, General Motors redesigned the body style of its Sierra 2500 line of heavy-duty three-quarter ton trucks. The company offered the 2007 models in a number of trim packages, each with a regular, extended or "Crew" cab cabin and with a long or regular bed length. Prospective buyers could purchase all trim levels of the 2007 2500HD with the optional Duramax engine.

Duramax Engine

GMC offered one Duramax engine for the 2500HD, a 6.6-liter displacement turbo-diesel. This engine consisted of an iron block and aluminum heads outfitted with a Garrett turbocharger. The company built the intake manifold from aluminum, the exhaust manifold from nodular iron and the crankshaft, camshaft and connection rods from steel.

This engine uses an overhead-valve direct injection with four valves per cylinder, for 32 valves total. The engine's bore measures 4.05 inches with a stroke of 3.89 inches. A 6.6-liter Duramax has a compression ratio of 16.8 to 1. When installed in the 2500HD, it produces 365 horsepower at 3,200 rpm and 660 foot-lbs. of torque at 6,600 rpm.


General Motors installed a six-speed automatic with overdrive as the only available transmission for the 2007 Sierra 2500HD. Buyers could purchase any trim level, cab and bed length configuration in either rear-wheel or four-wheel drive.


The towing and payload capacities for the 2500HD depended on the body style and drive configuration. Four-wheel-drive models could tow a minimum of 13,000 lbs. and a maximum of 15,500 lbs. with a maximum payload between 3,031 lbs. and 3,646 lbs. Rear-wheel drive models could tow 14,400 to 15,800 lbs. with a maximum payload of 3,301 lbs. to 3,892 lbs.

The Duramax earned a fuel economy of 17 miles per gallon in the city and 21 mpg during highway driving. When towing, the 2500HD fuel rating could drop to as low as 9 mpg in the city and 13 mpg on the highway.


The external dimensions of the 2500HD line vary by cabin, trim level and bed length. Regular-cab models have two doors; extended and crew cab models offer four doors. These trucks can span a length of 224.7, 230.3, 240.0, 249.2 or 259.0 inches with a corresponding wheelbase of 133.0, 143.5, 153.0, 157.5 or 167.0 inches. Height ranges from 76.3 inches to 77.2 inches while all models span an overall width of 80 inches with a ground clearance of either 9.5 inches or 9.6 inches. Weight also depends on the drive configuration; rear-wheel-drive models weigh between 5,308 and 5,899 lbs. Four-wheel-drive models weigh between 5,554 and 6,169 lbs.

The regular, two-door cab style models seat three; extended and crew cab styles seat either five or six. A regular cab, "Work Truck" trim style 2500HD offers 41.4 inches of front headroom; all other body styles offer 41.3 inches of front headroom. Every body style provides 41.3 inches of front legroom and 62.5 inches of front hip room.

Extended and crew cab 2500HDs give rear passengers a respective 39.3 and 40.6 inches of headroom, 34.3 and 39.0 inches of legroom and 61.8 or 65.5 inches of hip room.

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