2007 GMC Sierra 1500 Classic 4WD Crew Cab Pickup Rear: Drum. 2007 GMC Sierra 1500 Classic RWD Rear: Drum. 2007 GMC Sierra 1500 Classic 4WD Extended Cab Pickup Rear: Drum. Notes: Centric Premium Wheel Cylinders -- Classic GMT 800; Front Caliper Bracket Cast # 2851C/286C.
