1963 Chevrolet Pick-up Truck Differential Carrier K20 Pickup - Yukon Dura Grip Positraction - Dana 44 - 30 Spline - Fits 3.73 and Down or Thick Gears - Front guaranteed to replace your current 1963 Chevrolet Pick-up Truck Differential Carrier K20 Pickup - Yukon Dura Grip Positraction - Dana 44 - 30 Spline - Fits 3.73 and Down or Thick Gears - Front. 1963 Chevrolet Pick-up Truck Differential Carrier comes new OEM 1963 Chevrolet Pick-up Truck Differential Carrier aftermarket new 1963 Chevrolet Pick-up Truck Differential Carrier of remanufactured 1963 Chevrolet Pick-up Truck Differential Carrier K20 Pickup - Yukon Dura Grip Positraction - Dana 44 - 30 Spline - Fits 3.73 and Down or Thick Gears - Front.