1976 GMC G15 Differential Carrier G15 - RWD - Yukon Dura Grip Positraction - GM 12 Bolt Truck - 30 Spline - Fits 2.73 - 3.42 Ratio or Thick Gears - Rear guaranteed to replace your current 1976 GMC G15 Differential Carrier G15 - RWD - Yukon Dura Grip Positraction - GM 12 Bolt Truck - 30 Spline - Fits 2.73 - 3.42 Ratio or Thick Gears - Rear. 1976 GMC G15 Differential Carrier comes new OEM 1976 GMC G15 Differential Carrier aftermarket new 1976 GMC G15 Differential Carrier of remanufactured 1976 GMC G15 Differential Carrier G15 - RWD - Yukon Dura Grip Positraction - GM 12 Bolt Truck - 30 Spline - Fits 2.73 - 3.42 Ratio or Thick Gears - Rear.