1980 Chevrolet Pick-up Truck Differential Carrier K30 - 4WD - Dana 60 - Yukon Grizzly Locker - Aftermarket 40 Spline Upgrade - 4.10 and Down or Thick Gear Ratio's - Front guaranteed to replace your current 1980 Chevrolet Pick-up Truck Differential Carrier K30 - 4WD - Dana 60 - Yukon Grizzly Locker - Aftermarket 40 Spline Upgrade - 4.10 and Down or Thick Gear Ratio's - Front. 1980 Chevrolet Pick-up Truck Differential Carrier comes new OEM 1980 Chevrolet Pick-up Truck Differential Carrier aftermarket new 1980 Chevrolet Pick-up Truck Differential Carrier of remanufactured 1980 Chevrolet Pick-up Truck Differential Carrier K30 - 4WD - Dana 60 - Yukon Grizzly Locker - Aftermarket 40 Spline Upgrade - 4.10 and Down or Thick Gear Ratio's - Front.