Fluid · Rear DifferentialRear Differentialfor 2021 GMC Sierra 2500HD 6.6L V8 L8T · 4WDFluid TypeACDelco 75W-90 Synthetic Gear OilCapacity2qtOther fluid systems on this vehicleBrake FluidCoolant18 qtEngine Oil8.5 qtFront Differential1.5 qtPower SteeringTransfer Case2.5 qtAutomatic Transmission13.5 qtWasher Fluid3.5 qt📝 Suggest a correction to this fluid spec