2007 Gmc sierra 2500hd classic specs Read Also: 2007 Gmc sierra classic 2500hd duramax specs 2007 Gmc sierra classic 2500hd specs 2007 Gmc sierra 2500hd classic review 2007 Gmc sierra denali classic specs 2007 Gmc sierra 2500hd specs 2007 Gmc sierra 2500hd classic diesel