Fluid · CoolantCoolantfor 1990 GMC Sierra 2500 7.4L V8 454 · 4WDFluid TypeACDelco DEX-COOL (Orange)Capacity18qtNotesUse pre-mixed or mix 50/50 with distilled waterOther fluid systems on this vehicleBrake FluidEngine Oil8.5 qtFront Differential1.5 qtPower Steering1 qtRear Differential2 qtTransfer Case2.5 qtAutomatic Transmission11.5 qtWasher Fluid3.5 qt📝 Suggest a correction to this fluid spec