OER Parts offers a wide selection of Rear End Components for your 2004 GMC Truck. OER Parts offers 2004 GMC Truck Axle Shafts & Parts, 2004 GMC Truck Differential, 2004 GMC Truck Differential Covers, 2004 GMC Truck Differential Hardware, 2004 GMC Truck Differential Tools, 2004 GMC Truck Driveshaft, 2004 GMC Truck Driveshaft Safety Loops, 2004 GMC Truck Gaskets & Seals, 2004 GMC Truck Performance Rear Ends, 2004 GMC Truck Ring & Pinion Gears, and 2004 GMC Truck U-Joints and Parts.