The first generation GMC Sierra 2500HD became the Sierra 2500HD Classic in 2007 based on the tried and true GMT800 frame. Essentially the same vehicle as the 2006 Sierra 2500HD, the GMC Sierra 2500HD ...

For 2007, the Sierra 1500HD resided as part of the GMC brand’s Classic line of trucks based on the outgoing GMT800 platform. Featuring a heavy-duty suspension mounted to a durable hydroformed chassis, ...