OER Parts offers a wide selection of Rear End Components for your 1985 GMC C3500. OER Parts offers 1985 GMC C3500 Axle Shafts & Parts, 1985 GMC C3500 Differential, 1985 GMC C3500 Differential Covers, 1985 GMC C3500 Differential Hardware, 1985 GMC C3500 Differential Tools, 1985 GMC C3500 Driveshaft, 1985 GMC C3500 Driveshaft Safety Loops, 1985 GMC C3500 Gaskets & Seals, 1985 GMC C3500 Performance Rear Ends, 1985 GMC C3500 Ring & Pinion Gears, and 1985 GMC C3500 U-Joints and Parts.