1989 GMC Pick-up Truck Differential Rebuild Kit K2500 - 4WD - GM 10.5 in. Rear - 14 Bolt Cover - Differential Rebuild Kit - Uses HM903210 / HM903249 Pinion Bearing (3.750 in. Diameter Race) - Early Pinion Seal, Fits 2.200 in. Hub Diameter - Rear guaranteed to replace your current 1989 GMC Pick-up Truck Differential Rebuild Kit K2500 - 4WD - GM 10.5 in. Rear - 14 Bolt Cover - Differential Rebuild Kit - Uses HM903210 / HM903249 Pinion Bearing (3.750 in. Diameter Race) - Early Pinion Seal, Fits 2.200 in. Hub Diameter - Rear. 1989 GMC Pick-up Truck Differential Rebuild Kit comes new OEM 1989 GMC Pick-up Truck Differential Rebuild Kit aftermarket new 1989 GMC Pick-up Truck Differential Rebuild Kit of remanufactured 1989 GMC Pick-up Truck Differential Rebuild Kit K2500 - 4WD - GM 10.5 in. Rear - 14 Bolt Cover - Differential Rebuild Kit - Uses HM903210 / HM903249 Pinion Bearing (3.750 in. Diameter Race) - Early Pinion Seal, Fits 2.200 in. Hub Diameter - Rear.