1985 GMC Pick-up Truck Differential Rebuild Kit K2500 - 4WD - GM 9.5 in. Rear - w/ 14 Bolt Cover - Differential Rebuild Kit - Timken Bearings - Rear guaranteed to replace your current 1985 GMC Pick-up Truck Differential Rebuild Kit K2500 - 4WD - GM 9.5 in. Rear - w/ 14 Bolt Cover - Differential Rebuild Kit - Timken Bearings - Rear. 1985 GMC Pick-up Truck Differential Rebuild Kit comes new OEM 1985 GMC Pick-up Truck Differential Rebuild Kit aftermarket new 1985 GMC Pick-up Truck Differential Rebuild Kit of remanufactured 1985 GMC Pick-up Truck Differential Rebuild Kit K2500 - 4WD - GM 9.5 in. Rear - w/ 14 Bolt Cover - Differential Rebuild Kit - Timken Bearings - Rear.