DESCRIPTION 2005 GMC Extended Cab Pickup (CP1139, Unit 7170), 4x4, Vortec gas engine, automatic transmission, air conditioning, heat, Am/Fm CD radio, cruise control, power windows & locks, power drivers seat, rear hitch, LT265/70R17 tires, shows 247,061 miles. Serial Number: 1GTEK19Z05Z177724 Notes: Engine has a knock.