2006 GMC SIERRA 3500 SLT 4X4, for over 35 years schumacher has been an organization that people know to be of the highest integrity, providing you world class products and a sincere focus on your ongoing satisfaction. our customers and employees are our greatest asset and we respect and value their contributions. this 2006 gmc sierra 3500 slt 4x4 is black with gray leather interior. it is equipped with a duramax turbodiesel v8 engine and an automatic transmission. the options and features include: driver & front-right passenger airbags, onstar safe & sound system capability, passlock theft deterrent system, 10-way power driver seat, 12-volt power accessory outlets, 2-position driver memory system, 8-point compass, air conditioning, am/fm stereo w/compact disc player, cruise control, dual-zone automatic climate control system, electric rear window defogger, electrochromic interior rearview mirror, heated reclining front bucket seats, leather upholstery, power door locks, power driver seat lumbar support, power